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36 * \brief Implements gmx::HostAllocationPolicy for allocating memory
37 * suitable for e.g. GPU transfers on CUDA.
39 * \author Mark Abraham <mark.j.abraham@gmail.com>
43 #include "hostallocator.h"
51 #include "gromacs/gpu_utils/gpu_utils.h"
52 #include "gromacs/gpu_utils/pinning.h"
53 #include "gromacs/utility/alignedallocator.h"
54 #include "gromacs/utility/gmxassert.h"
55 #include "gromacs/utility/stringutil.h"
60 HostAllocationPolicy::HostAllocationPolicy(PinningPolicy pinningPolicy)
61 : pinningPolicy_(pinningPolicy)
63 if (GMX_GPU != GMX_GPU_CUDA)
65 GMX_RELEASE_ASSERT(pinningPolicy == PinningPolicy::CannotBePinned,
66 "A suitable build of GROMACS (e.g. with CUDA) is required for a "
67 "HostAllocationPolicy to be set to a mode that produces pinning.");
71 std::size_t HostAllocationPolicy::alignment()
73 return (pinningPolicy_ == PinningPolicy::CanBePinned ?
74 PageAlignedAllocationPolicy::alignment() :
75 AlignedAllocationPolicy::alignment());
78 void *HostAllocationPolicy::malloc(std::size_t bytes) const noexcept
80 if (pinningPolicy_ == PinningPolicy::CanBePinned)
82 void *p = PageAlignedAllocationPolicy::malloc(bytes);
88 return AlignedAllocationPolicy::malloc(bytes);
92 void HostAllocationPolicy::free(void *buffer) const noexcept
94 if (buffer == nullptr)
100 if (pinningPolicy_ == PinningPolicy::CanBePinned)
102 PageAlignedAllocationPolicy::free(buffer);
106 AlignedAllocationPolicy::free(buffer);
110 void HostAllocationPolicy::pin(void gmx_unused *p, size_t gmx_unused n) const noexcept
112 #if GMX_GPU == GMX_GPU_CUDA
113 // I believe this if statement isn't required for calls from malloc. But it
114 // is required for the unit tests. Which might not make much sense to test
115 // cases which can't actually happen for an allocator.
116 if (p == nullptr || n == 0 || isHostMemoryPinned(p))
124 void HostAllocationPolicy::unpin(void gmx_unused *p) const noexcept
126 #if GMX_GPU == GMX_GPU_CUDA
127 if (isHostMemoryPinned(p))