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Always Use cudaMallocHost to allocate and pin CPU memory #3060

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Always Use cudaMallocHost to allocate and pin CPU memory #3060

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20 changes: 9 additions & 11 deletions include/caffe/syncedmem.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -8,30 +8,28 @@

namespace caffe {

// If CUDA is available and in GPU mode, host memory will be allocated pinned,
// If CUDA is available, host memory will be allocated pinned,
// using cudaMallocHost. It avoids dynamic pinning for transfers (DMA).
// The improvement in performance seems negligible in the single GPU case,
// but might be more significant for parallel training. Most importantly,
// it improved stability for large models on many GPUs.
inline void CaffeMallocHost(void** ptr, size_t size) {
#ifndef CPU_ONLY
if (Caffe::mode() == Caffe::GPU) {
CUDA_CHECK(cudaMallocHost(ptr, size));
return;
}
#endif
// Always use cudaMallocHost to allocate cpu memory (unless in CPU_ONLY build)
// so that memory allocation and free do not depend on Caffe::mode()
CUDA_CHECK(cudaMallocHost(ptr, size));
#else
*ptr = malloc(size);
CHECK(*ptr) << "host allocation of size " << size << " failed";
#endif
}

inline void CaffeFreeHost(void* ptr) {
#ifndef CPU_ONLY
if (Caffe::mode() == Caffe::GPU) {
CUDA_CHECK(cudaFreeHost(ptr));
return;
}
#endif
CUDA_CHECK(cudaFreeHost(ptr));
#else
free(ptr);
#endif
}


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