[0db7dbd] | 1 | """ |
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[b0de252] | 2 | GPU driver for C kernels (with CUDA) |
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| 3 | |
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| 4 | To select cuda, use SAS_OPENCL=cuda, or SAS_OPENCL=cuda:n for a particular |
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| 5 | device number. If no device number is specified, then look for CUDA_DEVICE=n |
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| 6 | or a file ~/.cuda-device containing n for the device number. Otherwise, try |
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| 7 | all available device numbers. |
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| 8 | |
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| 9 | TODO: docs are out of date |
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[0db7dbd] | 10 | |
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| 11 | There should be a single GPU environment running on the system. This |
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| 12 | environment is constructed on the first call to :func:`env`, and the |
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| 13 | same environment is returned on each call. |
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| 14 | |
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| 15 | After retrieving the environment, the next step is to create the kernel. |
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| 16 | This is done with a call to :meth:`GpuEnvironment.make_kernel`, which |
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| 17 | returns the type of data used by the kernel. |
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| 18 | |
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| 19 | Next a :class:`GpuData` object should be created with the correct kind |
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| 20 | of data. This data object can be used by multiple kernels, for example, |
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| 21 | if the target model is a weighted sum of multiple kernels. The data |
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| 22 | should include any extra evaluation points required to compute the proper |
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| 23 | data smearing. This need not match the square grid for 2D data if there |
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| 24 | is an index saying which q points are active. |
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| 25 | |
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| 26 | Together the GpuData, the program, and a device form a :class:`GpuKernel`. |
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| 27 | This kernel is used during fitting, receiving new sets of parameters and |
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| 28 | evaluating them. The output value is stored in an output buffer on the |
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| 29 | devices, where it can be combined with other structure factors and form |
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| 30 | factors and have instrumental resolution effects applied. |
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| 31 | |
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| 32 | In order to use OpenCL for your models, you will need OpenCL drivers for |
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| 33 | your machine. These should be available from your graphics card vendor. |
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| 34 | Intel provides OpenCL drivers for CPUs as well as their integrated HD |
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| 35 | graphics chipsets. AMD also provides drivers for Intel CPUs, but as of |
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| 36 | this writing the performance is lacking compared to the Intel drivers. |
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| 37 | NVidia combines drivers for CUDA and OpenCL in one package. The result |
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| 38 | is a bit messy if you have multiple drivers installed. You can see which |
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| 39 | drivers are available by starting python and running: |
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| 40 | |
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| 41 | import pyopencl as cl |
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| 42 | cl.create_some_context(interactive=True) |
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| 43 | |
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| 44 | Once you have done that, it will show the available drivers which you |
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| 45 | can select. It will then tell you that you can use these drivers |
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| 46 | automatically by setting the SAS_OPENCL environment variable, which is |
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| 47 | PYOPENCL_CTX equivalent but not conflicting with other pyopnecl programs. |
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| 48 | |
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| 49 | Some graphics cards have multiple devices on the same card. You cannot |
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| 50 | yet use both of them concurrently to evaluate models, but you can run |
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| 51 | the program twice using a different device for each session. |
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| 52 | |
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| 53 | OpenCL kernels are compiled when needed by the device driver. Some |
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| 54 | drivers produce compiler output even when there is no error. You |
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| 55 | can see the output by setting PYOPENCL_COMPILER_OUTPUT=1. It should be |
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| 56 | harmless, albeit annoying. |
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| 57 | """ |
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| 58 | from __future__ import print_function |
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| 59 | |
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| 60 | import os |
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| 61 | import warnings |
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| 62 | import logging |
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| 63 | import time |
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[74e9b5f] | 64 | import re |
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[0db7dbd] | 65 | |
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| 66 | import numpy as np # type: ignore |
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| 67 | |
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| 68 | |
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[b0de252] | 69 | # Attempt to setup cuda. This may fail if the pycuda package is not |
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[0db7dbd] | 70 | # installed or if it is installed but there are no devices available. |
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| 71 | try: |
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| 72 | import pycuda.driver as cuda # type: ignore |
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| 73 | from pycuda.compiler import SourceModule |
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[b0de252] | 74 | from pycuda.tools import make_default_context, clear_context_caches |
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| 75 | # Ask CUDA for the default context (so that we know that one exists) |
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| 76 | # then immediately throw it away in case the user doesn't want it. |
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| 77 | # Note: cribbed from pycuda.autoinit |
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| 78 | cuda.init() |
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| 79 | context = make_default_context() |
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| 80 | context.pop() |
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| 81 | clear_context_caches() |
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| 82 | del context |
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[0db7dbd] | 83 | HAVE_CUDA = True |
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| 84 | CUDA_ERROR = "" |
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| 85 | except Exception as exc: |
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| 86 | HAVE_CUDA = False |
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| 87 | CUDA_ERROR = str(exc) |
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| 88 | |
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| 89 | from . import generate |
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| 90 | from .kernel import KernelModel, Kernel |
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| 91 | |
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| 92 | # pylint: disable=unused-import |
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| 93 | try: |
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| 94 | from typing import Tuple, Callable, Any |
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| 95 | from .modelinfo import ModelInfo |
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| 96 | from .details import CallDetails |
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| 97 | except ImportError: |
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| 98 | pass |
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| 99 | # pylint: enable=unused-import |
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| 100 | |
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| 101 | # The max loops number is limited by the amount of local memory available |
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| 102 | # on the device. You don't want to make this value too big because it will |
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| 103 | # waste resources, nor too small because it may interfere with users trying |
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| 104 | # to do their polydispersity calculations. A value of 1024 should be much |
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| 105 | # larger than necessary given that cost grows as npts^k where k is the number |
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| 106 | # of polydisperse parameters. |
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| 107 | MAX_LOOPS = 2048 |
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| 108 | |
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| 109 | def use_cuda(): |
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[b0de252] | 110 | env = os.environ.get("SAS_OPENCL", "").lower() |
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| 111 | return HAVE_CUDA and (env == "" or env.startswith("cuda")) |
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[0db7dbd] | 112 | |
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| 113 | ENV = None |
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| 114 | def reset_environment(): |
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| 115 | """ |
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| 116 | Call to create a new OpenCL context, such as after a change to SAS_OPENCL. |
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| 117 | """ |
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| 118 | global ENV |
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[b0de252] | 119 | # Free any previous allocated context. |
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| 120 | if ENV is not None and ENV.context is not None: |
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| 121 | ENV.release() |
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[0db7dbd] | 122 | ENV = GpuEnvironment() if use_cuda() else None |
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| 123 | |
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| 124 | def environment(): |
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| 125 | # type: () -> "GpuEnvironment" |
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| 126 | """ |
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| 127 | Returns a singleton :class:`GpuEnvironment`. |
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| 128 | |
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| 129 | This provides an OpenCL context and one queue per device. |
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| 130 | """ |
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| 131 | if ENV is None: |
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| 132 | if not HAVE_CUDA: |
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[b0de252] | 133 | raise RuntimeError("CUDA startup failed with ***" |
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[0db7dbd] | 134 | + CUDA_ERROR + "***; using C compiler instead") |
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| 135 | reset_environment() |
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| 136 | if ENV is None: |
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| 137 | raise RuntimeError("SAS_OPENCL=None in environment") |
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| 138 | return ENV |
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| 139 | |
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[b0de252] | 140 | def has_type(dtype): |
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| 141 | # type: (np.dtype) -> bool |
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[0db7dbd] | 142 | """ |
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[b0de252] | 143 | Return true if device supports the requested precision. |
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[0db7dbd] | 144 | """ |
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[b0de252] | 145 | # Assume the nvidia card supports 32-bit and 64-bit floats. |
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| 146 | # TODO: check if pycuda support F16 |
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| 147 | return dtype in (generate.F32, generate.F64) |
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[0db7dbd] | 148 | |
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[74e9b5f] | 149 | |
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| 150 | FUNCTION_PATTERN = re.compile(r"""^ |
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| 151 | (?P<space>\s*) # initial space |
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| 152 | (?P<qualifiers>^(?:\s*\b\w+\b\s*)+) # one or more qualifiers before function |
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| 153 | (?P<function>\s*\b\w+\b\s*[(]) # function name plus open parens |
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| 154 | """, re.VERBOSE|re.MULTILINE) |
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| 155 | |
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| 156 | MARKED_PATTERN = re.compile(r""" |
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| 157 | \b(return|else|kernel|device|__device__)\b |
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| 158 | """, re.VERBOSE|re.MULTILINE) |
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| 159 | |
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| 160 | def _add_device_tag(match): |
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| 161 | # type: (None) -> str |
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| 162 | # Note: should be re.Match, but that isn't a simple type |
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| 163 | """ |
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| 164 | replace qualifiers with __device__ qualifiers if needed |
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| 165 | """ |
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| 166 | qualifiers = match.group("qualifiers") |
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| 167 | if MARKED_PATTERN.search(qualifiers): |
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| 168 | start, end = match.span() |
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| 169 | return match.string[start:end] |
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| 170 | else: |
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| 171 | function = match.group("function") |
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| 172 | space = match.group("space") |
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| 173 | return "".join((space, "__device__ ", qualifiers, function)) |
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| 174 | |
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| 175 | def mark_device_functions(source): |
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| 176 | # type: (str) -> str |
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| 177 | """ |
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| 178 | Mark all function declarations as __device__ functions (except kernel). |
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| 179 | """ |
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| 180 | return FUNCTION_PATTERN.sub(_add_device_tag, source) |
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| 181 | |
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| 182 | def show_device_functions(source): |
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| 183 | # type: (str) -> str |
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| 184 | """ |
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| 185 | Show all discovered function declarations, but don't change any. |
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| 186 | """ |
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| 187 | for match in FUNCTION_PATTERN.finditer(source): |
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| 188 | print(match.group('qualifiers').replace('\n',r'\n'), match.group('function'), '(') |
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| 189 | return source |
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| 190 | |
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[0db7dbd] | 191 | def compile_model(source, dtype, fast=False): |
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[b0de252] | 192 | # type: (str, np.dtype, bool) -> SourceModule |
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[0db7dbd] | 193 | """ |
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| 194 | Build a model to run on the gpu. |
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| 195 | |
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| 196 | Returns the compiled program and its type. The returned type will |
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| 197 | be float32 even if the desired type is float64 if any of the |
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| 198 | devices in the context do not support the cl_khr_fp64 extension. |
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| 199 | """ |
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[b0de252] | 200 | dtype = np.dtype(dtype) |
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| 201 | if not has_type(dtype): |
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| 202 | raise RuntimeError("%s not supported for devices"%dtype) |
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[0db7dbd] | 203 | |
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[b0de252] | 204 | source_list = [generate.convert_type(source, dtype)] |
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[0db7dbd] | 205 | |
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| 206 | source_list.insert(0, "#define USE_SINCOS\n") |
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| 207 | source = "\n".join(source_list) |
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[74e9b5f] | 208 | #source = show_device_functions(source) |
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| 209 | source = mark_device_functions(source) |
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| 210 | #with open('/tmp/kernel.cu', 'w') as fd: fd.write(source) |
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| 211 | #print(source) |
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| 212 | #options = ['--verbose', '-E'] |
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| 213 | options = ['--use_fast_math'] if fast else None |
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[b0de252] | 214 | program = SourceModule(source, no_extern_c=True, options=options) # include_dirs=[...] |
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[74e9b5f] | 215 | |
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[b0de252] | 216 | #print("done with "+program) |
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[0db7dbd] | 217 | return program |
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| 218 | |
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| 219 | |
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| 220 | # for now, this returns one device in the context |
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| 221 | # TODO: create a context that contains all devices on all platforms |
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| 222 | class GpuEnvironment(object): |
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| 223 | """ |
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| 224 | GPU context, with possibly many devices, and one queue per device. |
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| 225 | """ |
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[b0de252] | 226 | context = None # type: cuda.Context |
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| 227 | def __init__(self, devnum=None): |
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| 228 | # type: (int) -> None |
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[0db7dbd] | 229 | # Byte boundary for data alignment |
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| 230 | #self.data_boundary = max(d.min_data_type_align_size |
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| 231 | # for d in self.context.devices) |
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| 232 | self.compiled = {} |
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[b0de252] | 233 | env = os.environ.get("SAS_OPENCL", "").lower() |
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| 234 | if devnum is None and env.startswith("cuda:"): |
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| 235 | devnum = int(env[5:]) |
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| 236 | # Set the global context to the particular device number if one is |
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| 237 | # given, otherwise use the default context. Perhaps this will be set |
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| 238 | # by an environment variable within autoinit. |
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| 239 | if devnum is not None: |
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| 240 | self.context = cuda.Device(devnum).make_context() |
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| 241 | else: |
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| 242 | self.context = make_default_context() |
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| 243 | |
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| 244 | def release(self): |
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| 245 | if self.context is not None: |
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| 246 | self.context.pop() |
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| 247 | self.context = None |
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| 248 | |
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| 249 | def __del__(self): |
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| 250 | self.release() |
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[0db7dbd] | 251 | |
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| 252 | def has_type(self, dtype): |
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| 253 | # type: (np.dtype) -> bool |
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| 254 | """ |
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| 255 | Return True if all devices support a given type. |
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| 256 | """ |
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[b0de252] | 257 | return has_type(dtype) |
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[0db7dbd] | 258 | |
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| 259 | def compile_program(self, name, source, dtype, fast, timestamp): |
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| 260 | # type: (str, str, np.dtype, bool, float) -> cl.Program |
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| 261 | """ |
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| 262 | Compile the program for the device in the given context. |
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| 263 | """ |
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| 264 | # Note: PyOpenCL caches based on md5 hash of source, options and device |
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| 265 | # so we don't really need to cache things for ourselves. I'll do so |
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| 266 | # anyway just to save some data munging time. |
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| 267 | tag = generate.tag_source(source) |
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| 268 | key = "%s-%s-%s%s"%(name, dtype, tag, ("-fast" if fast else "")) |
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| 269 | # Check timestamp on program |
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| 270 | program, program_timestamp = self.compiled.get(key, (None, np.inf)) |
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| 271 | if program_timestamp < timestamp: |
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| 272 | del self.compiled[key] |
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| 273 | if key not in self.compiled: |
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| 274 | logging.info("building %s for CUDA", key) |
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| 275 | program = compile_model(str(source), dtype, fast) |
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| 276 | self.compiled[key] = (program, timestamp) |
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| 277 | return program |
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| 278 | |
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| 279 | class GpuModel(KernelModel): |
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| 280 | """ |
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| 281 | GPU wrapper for a single model. |
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| 282 | |
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| 283 | *source* and *model_info* are the model source and interface as returned |
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| 284 | from :func:`generate.make_source` and :func:`generate.make_model_info`. |
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| 285 | |
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| 286 | *dtype* is the desired model precision. Any numpy dtype for single |
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| 287 | or double precision floats will do, such as 'f', 'float32' or 'single' |
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| 288 | for single and 'd', 'float64' or 'double' for double. Double precision |
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| 289 | is an optional extension which may not be available on all devices. |
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| 290 | Half precision ('float16','half') may be available on some devices. |
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| 291 | Fast precision ('fast') is a loose version of single precision, indicating |
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| 292 | that the compiler is allowed to take shortcuts. |
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| 293 | """ |
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[b0de252] | 294 | info = None # type: ModelInfo |
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| 295 | source = "" # type: str |
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| 296 | dtype = None # type: np.dtype |
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| 297 | fast = False # type: bool |
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| 298 | program = None # type: SourceModule |
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| 299 | _kernels = None # type: List[cuda.Function] |
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| 300 | |
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[0db7dbd] | 301 | def __init__(self, source, model_info, dtype=generate.F32, fast=False): |
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| 302 | # type: (Dict[str,str], ModelInfo, np.dtype, bool) -> None |
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| 303 | self.info = model_info |
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| 304 | self.source = source |
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| 305 | self.dtype = dtype |
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| 306 | self.fast = fast |
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| 307 | self.program = None # delay program creation |
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| 308 | self._kernels = None |
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| 309 | |
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| 310 | def __getstate__(self): |
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| 311 | # type: () -> Tuple[ModelInfo, str, np.dtype, bool] |
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| 312 | return self.info, self.source, self.dtype, self.fast |
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| 313 | |
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| 314 | def __setstate__(self, state): |
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| 315 | # type: (Tuple[ModelInfo, str, np.dtype, bool]) -> None |
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| 316 | self.info, self.source, self.dtype, self.fast = state |
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| 317 | self.program = None |
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| 318 | |
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| 319 | def make_kernel(self, q_vectors): |
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| 320 | # type: (List[np.ndarray]) -> "GpuKernel" |
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| 321 | if self.program is None: |
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| 322 | compile_program = environment().compile_program |
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| 323 | timestamp = generate.ocl_timestamp(self.info) |
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| 324 | self.program = compile_program( |
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| 325 | self.info.name, |
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| 326 | self.source['opencl'], |
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| 327 | self.dtype, |
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| 328 | self.fast, |
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| 329 | timestamp) |
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| 330 | variants = ['Iq', 'Iqxy', 'Imagnetic'] |
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| 331 | names = [generate.kernel_name(self.info, k) for k in variants] |
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| 332 | kernels = [self.program.get_function(k) for k in names] |
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| 333 | self._kernels = dict((k, v) for k, v in zip(variants, kernels)) |
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| 334 | is_2d = len(q_vectors) == 2 |
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| 335 | if is_2d: |
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| 336 | kernel = [self._kernels['Iqxy'], self._kernels['Imagnetic']] |
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| 337 | else: |
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| 338 | kernel = [self._kernels['Iq']]*2 |
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| 339 | return GpuKernel(kernel, self.dtype, self.info, q_vectors) |
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| 340 | |
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| 341 | def release(self): |
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| 342 | # type: () -> None |
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| 343 | """ |
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| 344 | Free the resources associated with the model. |
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| 345 | """ |
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| 346 | if self.program is not None: |
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| 347 | self.program = None |
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| 348 | |
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| 349 | def __del__(self): |
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| 350 | # type: () -> None |
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| 351 | self.release() |
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| 352 | |
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| 353 | # TODO: check that we don't need a destructor for buffers which go out of scope |
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| 354 | class GpuInput(object): |
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| 355 | """ |
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| 356 | Make q data available to the gpu. |
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| 357 | |
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| 358 | *q_vectors* is a list of q vectors, which will be *[q]* for 1-D data, |
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| 359 | and *[qx, qy]* for 2-D data. Internally, the vectors will be reallocated |
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| 360 | to get the best performance on OpenCL, which may involve shifting and |
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| 361 | stretching the array to better match the memory architecture. Additional |
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| 362 | points will be evaluated with *q=1e-3*. |
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| 363 | |
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| 364 | *dtype* is the data type for the q vectors. The data type should be |
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| 365 | set to match that of the kernel, which is an attribute of |
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| 366 | :class:`GpuProgram`. Note that not all kernels support double |
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| 367 | precision, so even if the program was created for double precision, |
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| 368 | the *GpuProgram.dtype* may be single precision. |
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| 369 | |
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| 370 | Call :meth:`release` when complete. Even if not called directly, the |
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| 371 | buffer will be released when the data object is freed. |
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| 372 | """ |
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| 373 | def __init__(self, q_vectors, dtype=generate.F32): |
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| 374 | # type: (List[np.ndarray], np.dtype) -> None |
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| 375 | # TODO: do we ever need double precision q? |
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| 376 | self.nq = q_vectors[0].size |
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| 377 | self.dtype = np.dtype(dtype) |
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| 378 | self.is_2d = (len(q_vectors) == 2) |
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| 379 | # TODO: stretch input based on get_warp() |
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| 380 | # not doing it now since warp depends on kernel, which is not known |
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| 381 | # at this point, so instead using 32, which is good on the set of |
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| 382 | # architectures tested so far. |
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| 383 | if self.is_2d: |
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| 384 | # Note: 16 rather than 15 because result is 1 longer than input. |
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| 385 | width = ((self.nq+16)//16)*16 |
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| 386 | self.q = np.empty((width, 2), dtype=dtype) |
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| 387 | self.q[:self.nq, 0] = q_vectors[0] |
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| 388 | self.q[:self.nq, 1] = q_vectors[1] |
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| 389 | else: |
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| 390 | # Note: 32 rather than 31 because result is 1 longer than input. |
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| 391 | width = ((self.nq+32)//32)*32 |
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| 392 | self.q = np.empty(width, dtype=dtype) |
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| 393 | self.q[:self.nq] = q_vectors[0] |
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| 394 | self.global_size = [self.q.shape[0]] |
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| 395 | #print("creating inputs of size", self.global_size) |
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| 396 | self.q_b = cuda.to_device(self.q) |
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| 397 | |
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| 398 | def release(self): |
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| 399 | # type: () -> None |
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| 400 | """ |
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| 401 | Free the memory. |
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| 402 | """ |
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| 403 | if self.q_b is not None: |
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| 404 | self.q_b.free() |
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| 405 | self.q_b = None |
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| 406 | |
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| 407 | def __del__(self): |
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| 408 | # type: () -> None |
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| 409 | self.release() |
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| 410 | |
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| 411 | class GpuKernel(Kernel): |
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| 412 | """ |
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| 413 | Callable SAS kernel. |
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| 414 | |
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| 415 | *kernel* is the GpuKernel object to call |
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| 416 | |
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| 417 | *model_info* is the module information |
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| 418 | |
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| 419 | *q_vectors* is the q vectors at which the kernel should be evaluated |
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| 420 | |
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| 421 | *dtype* is the kernel precision |
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| 422 | |
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| 423 | The resulting call method takes the *pars*, a list of values for |
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| 424 | the fixed parameters to the kernel, and *pd_pars*, a list of (value,weight) |
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| 425 | vectors for the polydisperse parameters. *cutoff* determines the |
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| 426 | integration limits: any points with combined weight less than *cutoff* |
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| 427 | will not be calculated. |
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| 428 | |
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| 429 | Call :meth:`release` when done with the kernel instance. |
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| 430 | """ |
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| 431 | def __init__(self, kernel, dtype, model_info, q_vectors): |
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| 432 | # type: (cl.Kernel, np.dtype, ModelInfo, List[np.ndarray]) -> None |
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[869fd7b] | 433 | self.q_input = GpuInput(q_vectors, dtype) |
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[0db7dbd] | 434 | self.kernel = kernel |
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[f872fd1] | 435 | # F16 isn't sufficient, so don't support it |
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| 436 | self._as_dtype = np.float64 if dtype == generate.F64 else np.float32 |
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[869fd7b] | 437 | |
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| 438 | # attributes accessed from the outside |
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| 439 | self.dim = '2d' if self.q_input.is_2d else '1d' |
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[0db7dbd] | 440 | self.info = model_info |
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| 441 | self.dtype = dtype |
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[869fd7b] | 442 | |
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| 443 | # holding place for the returned value |
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| 444 | nout = 2 if self.info.have_Fq and self.dim == '1d' else 1 |
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| 445 | extra_q = 4 # total weight, form volume, shell volume and R_eff |
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| 446 | self.result = np.empty(self.q_input.nq*nout+extra_q, dtype) |
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[0db7dbd] | 447 | |
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| 448 | # Inputs and outputs for each kernel call |
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| 449 | # Note: res may be shorter than res_b if global_size != nq |
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[869fd7b] | 450 | width = ((self.result.size+31)//32)*32 * self.dtype.itemsize |
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| 451 | self.result_b = cuda.mem_alloc(width) |
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[8b31efa] | 452 | self._need_release = [self.result_b] |
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[0db7dbd] | 453 | |
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[869fd7b] | 454 | def _call_kernel(self, call_details, values, cutoff, magnetic, effective_radius_type): |
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[0db7dbd] | 455 | # type: (CallDetails, np.ndarray, np.ndarray, float, bool) -> np.ndarray |
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| 456 | # Arrange data transfer to card |
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| 457 | details_b = cuda.to_device(call_details.buffer) |
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| 458 | values_b = cuda.to_device(values) |
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| 459 | |
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| 460 | kernel = self.kernel[1 if magnetic else 0] |
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| 461 | args = [ |
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| 462 | np.uint32(self.q_input.nq), None, None, |
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| 463 | details_b, values_b, self.q_input.q_b, self.result_b, |
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[869fd7b] | 464 | self._as_dtype(cutoff), |
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| 465 | np.uint32(effective_radius_type), |
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[0db7dbd] | 466 | ] |
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| 467 | grid = partition(self.q_input.nq) |
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| 468 | #print("Calling OpenCL") |
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| 469 | #call_details.show(values) |
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| 470 | # Call kernel and retrieve results |
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| 471 | last_nap = time.clock() |
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[8b31efa] | 472 | step = 100000000//self.q_input.nq + 1 |
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[0db7dbd] | 473 | #step = 1000000000 |
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| 474 | for start in range(0, call_details.num_eval, step): |
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| 475 | stop = min(start + step, call_details.num_eval) |
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| 476 | #print("queuing",start,stop) |
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| 477 | args[1:3] = [np.int32(start), np.int32(stop)] |
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| 478 | kernel(*args, **grid) |
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| 479 | if stop < call_details.num_eval: |
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| 480 | sync() |
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| 481 | # Allow other processes to run |
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| 482 | current_time = time.clock() |
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| 483 | if current_time - last_nap > 0.5: |
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[8b31efa] | 484 | time.sleep(0.001) |
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[0db7dbd] | 485 | last_nap = current_time |
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| 486 | sync() |
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| 487 | cuda.memcpy_dtoh(self.result, self.result_b) |
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| 488 | #print("result", self.result) |
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| 489 | |
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[b0de252] | 490 | details_b.free() |
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| 491 | values_b.free() |
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| 492 | |
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[0db7dbd] | 493 | def release(self): |
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| 494 | # type: () -> None |
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| 495 | """ |
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| 496 | Release resources associated with the kernel. |
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| 497 | """ |
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[8b31efa] | 498 | for p in self._need_release: |
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| 499 | p.free() |
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| 500 | self._need_release = [] |
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[0db7dbd] | 501 | |
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| 502 | def __del__(self): |
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| 503 | # type: () -> None |
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| 504 | self.release() |
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| 505 | |
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| 506 | |
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| 507 | def sync(): |
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| 508 | """ |
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| 509 | Overview: |
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| 510 | Waits for operation in the current context to complete. |
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| 511 | |
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| 512 | Note: Maybe context.synchronize() is sufficient. |
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| 513 | """ |
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| 514 | #return # The following works in C++; don't know what pycuda is doing |
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| 515 | # Create an event with which to synchronize |
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| 516 | done = cuda.Event() |
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| 517 | |
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| 518 | # Schedule an event trigger on the GPU. |
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| 519 | done.record() |
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| 520 | |
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| 521 | #line added to not hog resources |
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[b0de252] | 522 | while not done.query(): |
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| 523 | time.sleep(0.01) |
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[0db7dbd] | 524 | |
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| 525 | # Block until the GPU executes the kernel. |
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| 526 | done.synchronize() |
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| 527 | # Clean up the event; I don't think they can be reused. |
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| 528 | del done |
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| 529 | |
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| 530 | |
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| 531 | def partition(n): |
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| 532 | ''' |
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| 533 | Overview: |
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| 534 | Auto grids the thread blocks to achieve some level of calculation |
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| 535 | efficiency. |
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| 536 | ''' |
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[b0de252] | 537 | max_gx, max_gy = 65535, 65535 |
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[0db7dbd] | 538 | blocksize = 32 |
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[b0de252] | 539 | #max_gx, max_gy = 5, 65536 |
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[0db7dbd] | 540 | #blocksize = 3 |
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[b0de252] | 541 | block = (blocksize, 1, 1) |
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[0db7dbd] | 542 | num_blocks = int((n+blocksize-1)/blocksize) |
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| 543 | if num_blocks < max_gx: |
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[b0de252] | 544 | grid = (num_blocks, 1) |
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[0db7dbd] | 545 | else: |
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| 546 | gx = max_gx |
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| 547 | gy = (num_blocks + max_gx - 1) / max_gx |
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[b0de252] | 548 | if gy >= max_gy: |
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| 549 | raise ValueError("vector is too large") |
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| 550 | grid = (gx, gy) |
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| 551 | #print("block", block, "grid", grid) |
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| 552 | #print("waste", block[0]*block[1]*block[2]*grid[0]*grid[1] - n) |
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| 553 | return dict(block=block, grid=grid) |
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