mirror of
https://github.com/NVIDIA/cuda-samples.git
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244 lines
8.8 KiB
Plaintext
244 lines
8.8 KiB
Plaintext
/* Copyright (c) 2021, NVIDIA CORPORATION. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of NVIDIA CORPORATION nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* This sample demonstrates stream ordered memory allocation on a GPU using
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* cudaMallocAsync and cudaMemPool family of APIs.
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*
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* basicStreamOrderedAllocation(): demonstrates stream ordered allocation using
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* cudaMallocAsync/cudaFreeAsync APIs with default settings.
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*
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* streamOrderedAllocationPostSync(): demonstrates if there's a synchronization
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* in between allocations, then setting the release threshold on the pool will
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* make sure the synchronize will not free memory back to the OS.
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*/
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// System includes
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#include <assert.h>
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#include <stdio.h>
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#include <climits>
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// CUDA runtime
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#include <cuda_runtime.h>
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// helper functions and utilities to work with CUDA
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#include <helper_cuda.h>
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#include <helper_functions.h>
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#define MAX_ITER 20
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/* Add two vectors on the GPU */
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__global__ void vectorAddGPU(const float *a, const float *b, float *c, int N) {
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int idx = blockIdx.x * blockDim.x + threadIdx.x;
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if (idx < N) {
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c[idx] = a[idx] + b[idx];
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}
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}
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int basicStreamOrderedAllocation(const int dev, const int nelem, const float *a,
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const float *b, float *c) {
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float *d_a, *d_b, *d_c; // Device buffers
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float errorNorm, refNorm, ref, diff;
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size_t bytes = nelem * sizeof(float);
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cudaStream_t stream;
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printf("Starting basicStreamOrderedAllocation()\n");
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checkCudaErrors(cudaSetDevice(dev));
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checkCudaErrors(cudaStreamCreateWithFlags(&stream, cudaStreamNonBlocking));
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checkCudaErrors(cudaMallocAsync(&d_a, bytes, stream));
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checkCudaErrors(cudaMallocAsync(&d_b, bytes, stream));
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checkCudaErrors(cudaMallocAsync(&d_c, bytes, stream));
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checkCudaErrors(
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cudaMemcpyAsync(d_a, a, bytes, cudaMemcpyHostToDevice, stream));
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checkCudaErrors(
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cudaMemcpyAsync(d_b, b, bytes, cudaMemcpyHostToDevice, stream));
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dim3 block(256);
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dim3 grid((unsigned int)ceil(nelem / (float)block.x));
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vectorAddGPU<<<grid, block, 0, stream>>>(d_a, d_b, d_c, nelem);
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checkCudaErrors(cudaFreeAsync(d_a, stream));
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checkCudaErrors(cudaFreeAsync(d_b, stream));
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checkCudaErrors(
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cudaMemcpyAsync(c, d_c, bytes, cudaMemcpyDeviceToHost, stream));
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checkCudaErrors(cudaFreeAsync(d_c, stream));
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checkCudaErrors(cudaStreamSynchronize(stream));
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/* Compare the results */
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printf("> Checking the results from vectorAddGPU() ...\n");
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errorNorm = 0.f;
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refNorm = 0.f;
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for (int n = 0; n < nelem; n++) {
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ref = a[n] + b[n];
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diff = c[n] - ref;
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errorNorm += diff * diff;
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refNorm += ref * ref;
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}
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errorNorm = (float)sqrt((double)errorNorm);
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refNorm = (float)sqrt((double)refNorm);
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if (errorNorm / refNorm < 1.e-6f)
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printf("basicStreamOrderedAllocation PASSED\n");
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checkCudaErrors(cudaStreamDestroy(stream));
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return errorNorm / refNorm < 1.e-6f ? EXIT_SUCCESS : EXIT_FAILURE;
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}
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// streamOrderedAllocationPostSync(): demonstrates If the application wants the
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// memory to persist in the pool beyond synchronization, then it sets the
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// release threshold on the pool. This way, when the application reaches the
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// "steady state", it is no longer allocating/freeing memory from the OS.
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int streamOrderedAllocationPostSync(const int dev, const int nelem,
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const float *a, const float *b, float *c) {
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float *d_a, *d_b, *d_c; // Device buffers
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float errorNorm, refNorm, ref, diff;
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size_t bytes = nelem * sizeof(float);
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cudaStream_t stream;
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cudaMemPool_t memPool;
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cudaEvent_t start, end;
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printf("Starting streamOrderedAllocationPostSync()\n");
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checkCudaErrors(cudaSetDevice(dev));
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checkCudaErrors(cudaStreamCreateWithFlags(&stream, cudaStreamNonBlocking));
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checkCudaErrors(cudaEventCreate(&start));
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checkCudaErrors(cudaEventCreate(&end));
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checkCudaErrors(cudaDeviceGetDefaultMemPool(&memPool, dev));
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uint64_t thresholdVal = ULONG_MAX;
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// set high release threshold on the default pool so that cudaFreeAsync will
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// not actually release memory to the system. By default, the release
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// threshold for a memory pool is set to zero. This implies that the CUDA
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// driver is allowed to release a memory chunk back to the system as long as
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// it does not contain any active suballocations.
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checkCudaErrors(cudaMemPoolSetAttribute(
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memPool, cudaMemPoolAttrReleaseThreshold, (void *)&thresholdVal));
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// Record the start event
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checkCudaErrors(cudaEventRecord(start, stream));
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for (int i = 0; i < MAX_ITER; i++) {
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checkCudaErrors(cudaMallocAsync(&d_a, bytes, stream));
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checkCudaErrors(cudaMallocAsync(&d_b, bytes, stream));
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checkCudaErrors(cudaMallocAsync(&d_c, bytes, stream));
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checkCudaErrors(
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cudaMemcpyAsync(d_a, a, bytes, cudaMemcpyHostToDevice, stream));
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checkCudaErrors(
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cudaMemcpyAsync(d_b, b, bytes, cudaMemcpyHostToDevice, stream));
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dim3 block(256);
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dim3 grid((unsigned int)ceil(nelem / (float)block.x));
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vectorAddGPU<<<grid, block, 0, stream>>>(d_a, d_b, d_c, nelem);
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checkCudaErrors(cudaFreeAsync(d_a, stream));
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checkCudaErrors(cudaFreeAsync(d_b, stream));
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checkCudaErrors(
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cudaMemcpyAsync(c, d_c, bytes, cudaMemcpyDeviceToHost, stream));
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checkCudaErrors(cudaFreeAsync(d_c, stream));
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checkCudaErrors(cudaStreamSynchronize(stream));
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}
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checkCudaErrors(cudaEventRecord(end, stream));
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// Wait for the end event to complete
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checkCudaErrors(cudaEventSynchronize(end));
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float msecTotal = 0.0f;
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checkCudaErrors(cudaEventElapsedTime(&msecTotal, start, end));
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printf("Total elapsed time = %f ms over %d iterations\n", msecTotal,
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MAX_ITER);
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/* Compare the results */
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printf("> Checking the results from vectorAddGPU() ...\n");
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errorNorm = 0.f;
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refNorm = 0.f;
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for (int n = 0; n < nelem; n++) {
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ref = a[n] + b[n];
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diff = c[n] - ref;
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errorNorm += diff * diff;
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refNorm += ref * ref;
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}
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errorNorm = (float)sqrt((double)errorNorm);
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refNorm = (float)sqrt((double)refNorm);
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if (errorNorm / refNorm < 1.e-6f)
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printf("streamOrderedAllocationPostSync PASSED\n");
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checkCudaErrors(cudaStreamDestroy(stream));
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return errorNorm / refNorm < 1.e-6f ? EXIT_SUCCESS : EXIT_FAILURE;
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}
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int main(int argc, char **argv) {
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int nelem;
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int dev = 0; // use default device 0
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size_t bytes;
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float *a, *b, *c; // Host
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if (checkCmdLineFlag(argc, (const char **)argv, "help")) {
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printf("Usage: streamOrderedAllocation [OPTION]\n\n");
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printf("Options:\n");
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printf(" --device=[device #] Specify the device to be used\n");
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return EXIT_SUCCESS;
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}
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dev = findCudaDevice(argc, (const char **)argv);
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int isMemPoolSupported = 0;
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checkCudaErrors(cudaDeviceGetAttribute(&isMemPoolSupported,
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cudaDevAttrMemoryPoolsSupported, dev));
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if (!isMemPoolSupported) {
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printf("Waiving execution as device does not support Memory Pools\n");
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exit(EXIT_WAIVED);
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}
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// Allocate CPU memory.
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nelem = 1048576;
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bytes = nelem * sizeof(float);
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a = (float *)malloc(bytes);
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b = (float *)malloc(bytes);
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c = (float *)malloc(bytes);
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/* Initialize the vectors. */
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for (int n = 0; n < nelem; n++) {
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a[n] = rand() / (float)RAND_MAX;
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b[n] = rand() / (float)RAND_MAX;
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}
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int ret1 = basicStreamOrderedAllocation(dev, nelem, a, b, c);
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int ret2 = streamOrderedAllocationPostSync(dev, nelem, a, b, c);
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/* Memory clean up */
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free(a);
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free(b);
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free(c);
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return ((ret1 == EXIT_SUCCESS && ret2 == EXIT_SUCCESS) ? EXIT_SUCCESS
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: EXIT_FAILURE);
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}
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