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38 #include "gromacs/utility/smalloc.h"
39 #include "gromacs/legacyheaders/typedefs.h"
40 #include "cudautils.cuh"
42 /*** Generic CUDA data operation wrappers ***/
44 /*! Launches synchronous or asynchronous host to device memory copy.
46 * The copy is launched in stream s or if not specified, in stream 0.
48 static int cu_copy_D2H_generic(void * h_dest, void * d_src, size_t bytes,
49 bool bAsync = false, cudaStream_t s = 0)
53 if (h_dest == NULL || d_src == NULL || bytes == 0)
60 stat = cudaMemcpyAsync(h_dest, d_src, bytes, cudaMemcpyDeviceToHost, s);
61 CU_RET_ERR(stat, "DtoH cudaMemcpyAsync failed");
66 stat = cudaMemcpy(h_dest, d_src, bytes, cudaMemcpyDeviceToHost);
67 CU_RET_ERR(stat, "DtoH cudaMemcpy failed");
73 int cu_copy_D2H(void * h_dest, void * d_src, size_t bytes)
75 return cu_copy_D2H_generic(h_dest, d_src, bytes, false);
79 * The copy is launched in stream s or if not specified, in stream 0.
81 int cu_copy_D2H_async(void * h_dest, void * d_src, size_t bytes, cudaStream_t s = 0)
83 return cu_copy_D2H_generic(h_dest, d_src, bytes, true, s);
86 int cu_copy_D2H_alloc(void ** h_dest, void * d_src, size_t bytes)
88 if (h_dest == NULL || d_src == NULL || bytes == 0)
93 smalloc(*h_dest, bytes);
95 return cu_copy_D2H(*h_dest, d_src, bytes);
98 /*! Launches synchronous or asynchronous device to host memory copy.
100 * The copy is launched in stream s or if not specified, in stream 0.
102 static int cu_copy_H2D_generic(void * d_dest, void * h_src, size_t bytes,
103 bool bAsync = false, cudaStream_t s = 0)
107 if (d_dest == NULL || h_src == NULL || bytes == 0)
114 stat = cudaMemcpyAsync(d_dest, h_src, bytes, cudaMemcpyHostToDevice, s);
115 CU_RET_ERR(stat, "HtoD cudaMemcpyAsync failed");
119 stat = cudaMemcpy(d_dest, h_src, bytes, cudaMemcpyHostToDevice);
120 CU_RET_ERR(stat, "HtoD cudaMemcpy failed");
126 int cu_copy_H2D(void * d_dest, void * h_src, size_t bytes)
128 return cu_copy_H2D_generic(d_dest, h_src, bytes, false);
132 * The copy is launched in stream s or if not specified, in stream 0.
134 int cu_copy_H2D_async(void * d_dest, void * h_src, size_t bytes, cudaStream_t s = 0)
136 return cu_copy_H2D_generic(d_dest, h_src, bytes, true, s);
139 int cu_copy_H2D_alloc(void ** d_dest, void * h_src, size_t bytes)
143 if (d_dest == NULL || h_src == NULL || bytes == 0)
148 stat = cudaMalloc(d_dest, bytes);
149 CU_RET_ERR(stat, "cudaMalloc failed in cu_copy_H2D_alloc");
151 return cu_copy_H2D(*d_dest, h_src, bytes);
154 float cu_event_elapsed(cudaEvent_t start, cudaEvent_t end)
159 stat = cudaEventElapsedTime(&t, start, end);
160 CU_RET_ERR(stat, "cudaEventElapsedTime failed in cu_event_elapsed");
165 int cu_wait_event(cudaEvent_t e)
169 s = cudaEventSynchronize(e);
170 CU_RET_ERR(s, "cudaEventSynchronize failed in cu_wait_event");
176 * If time != NULL it also calculates the time elapsed between start and end and
177 * return this is milliseconds.
179 int cu_wait_event_time(cudaEvent_t end, cudaEvent_t start, float *time)
183 s = cudaEventSynchronize(end);
184 CU_RET_ERR(s, "cudaEventSynchronize failed in cu_wait_event");
188 *time = cu_event_elapsed(start, end);
194 /**** Operation on buffered arrays (arrays with "over-allocation" in gmx wording) *****/
197 * If the pointers to the size variables are NULL no resetting happens.
199 void cu_free_buffered(void *d_ptr, int *n, int *nalloc)
205 stat = cudaFree(d_ptr);
206 CU_RET_ERR(stat, "cudaFree failed");
221 * Reallocation of the memory pointed by d_ptr and copying of the data from
222 * the location pointed by h_src host-side pointer is done. Allocation is
223 * buffered and therefore freeing is only needed if the previously allocated
224 * space is not enough.
225 * The H2D copy is launched in stream s and can be done synchronously or
226 * asynchronously (the default is the latter).
228 void cu_realloc_buffered(void **d_dest, void *h_src,
230 int *curr_size, int *curr_alloc_size,
237 if (d_dest == NULL || req_size < 0)
242 /* reallocate only if the data does not fit = allocation size is smaller
243 than the current requested size */
244 if (req_size > *curr_alloc_size)
246 /* only free if the array has already been initialized */
247 if (*curr_alloc_size >= 0)
249 cu_free_buffered(*d_dest, curr_size, curr_alloc_size);
252 *curr_alloc_size = over_alloc_large(req_size);
254 stat = cudaMalloc(d_dest, *curr_alloc_size * type_size);
255 CU_RET_ERR(stat, "cudaMalloc failed in cu_free_buffered");
258 /* size could have changed without actual reallocation */
259 *curr_size = req_size;
261 /* upload to device */
266 cu_copy_H2D_async(*d_dest, h_src, *curr_size * type_size, s);
270 cu_copy_H2D(*d_dest, h_src, *curr_size * type_size);