GPUWatcher.cu
//
// Copyright (c) Microsoft. All rights reserved.
// Licensed under the MIT license. See LICENSE.md file in the project root for full license information.
//
#include "stdafx.h"
#include "BestGpu.h"
#ifndef CPUONLY
#include "GPUWatcher.h"
#include <cuda.h>
#include <cuda_runtime.h>
int GPUWatcher::GetGPUIdWithTheMostFreeMemory()
{
int deviceCount = 0;
cudaError_t error_id = cudaGetDeviceCount(&deviceCount);
if (error_id != cudaSuccess || deviceCount == 0)
{
return -1;
}
int curDev = 0;
size_t curMemory = 0;
for (int dev = 0; dev < deviceCount; ++dev)
{
size_t freeMem = GetFreeMemoryOnCUDADevice(dev);
if (freeMem > curMemory)
{
curMemory = freeMem;
curDev = dev;
}
}
return curDev;
}
size_t GPUWatcher::GetFreeMemoryOnCUDADevice(int devId)
{
cudaError_t result = cudaSetDevice(devId);
if (result != cudaSuccess)
{
return 0;
}
// get the amount of free memory on the graphics card
size_t free = 0;
size_t total = 0;
result = cudaMemGetInfo(&free, &total);
if (result != cudaSuccess)
{
return 0;
}
else
return free;
}
GPUWatcher::GPUWatcher(void)
{
}
GPUWatcher::~GPUWatcher(void)
{
}
#endif // CPUONLY