Stream && Event

作者：黑客灵魂 | 2024-06-24 11:05:18

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Stream && Event

Stream Tips：

1. for() cudaStreamCreate()

2. cudaMallocHost()

3. for() cudaMemcpyAsync(,,,stream[i]);

for() kernel<<<,,,stream[i]>>>()

for() cudaMemcpyAsync(,,,stream[i]);

cudaThreadSynchronize();

4. for() cudaStreamDestroy();

stream && event

Figure 1. Stream && event demo

Event Tips:

1. cudaEventCreate(&start);

cudaEventCreate(&stop);

2. cudaEventRecord(start,0);

for() cudaMemcpyAsync(,,,stream[i]);

for() kernel<<<,,,stream[i]>>>()

for() cudaMemcpyAsync(,,,stream[i]);

cudaEventRecord(stop,0);

cudaEventSynchronize(stop);

cudaEventElapsedTime(&elapsedTime, start, stop);

3. cudaEventDestroy(start);

cudaEventDestroy(stop);

Examples:

1. cudaEventCreate(&start);

cudaEventCreate(&stop);

2. cutCreateTimer(&timer);

cutResetTimer(timer);

cudaThreadSynchronize();

3. cutStartTimer(timer);

cudaEventRecord(start,0);

cudaMemcpyAsync();

kernel<<<>>>();

cudaMemcpyAsync();

cudaEventRecord(stop,0);

cutStopTimer(timer);

4. cudaEventQuery(stop)==true, cudaEventElapsedTimer();

5. gpu_time = 29.39 (time spent executing by GPU)

cutGetTimerValue(timer) = 0.05 (time spent by CPU in CUDA calls)

More about stream&&event, please visit: http://www.hpctech.com/

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