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added stereo_multi_gpu sample, cosmetic changes in multi_gpu sample

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This commit is contained in:
Alexey Spizhevoy
2011-02-03 12:02:39 +00:00
parent ed77955635
commit ea94b43541
3 changed files with 217 additions and 22 deletions
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54
samples/gpu/multi.cpp
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@@ -1,3 +1,6 @@
/* This sample demonstrates the way you can perform independed tasks
on the different GPUs */
// Disable some warnings which are caused with CUDA headers
#pragma warning(disable: 4201 4408 4100)
@@ -34,41 +37,50 @@ using namespace cv::gpu;
struct Worker { void operator()(int device_id) const; };
void destroyContexts();
#define cuSafeCall(code) if (code != CUDA_SUCCESS) { \
#define safeCall(code) if (code != CUDA_SUCCESS) { \
cout << "CUDA driver API error: code " << code \
<< ", file " << __FILE__ << ", line " << __LINE__ << endl; \
destroyContexts(); \
exit(-1); \
}
// Each GPU is associated with its own context
CUcontext contexts[2];
int main()
{
if (getCudaEnabledDeviceCount() < 2)
int num_devices = getCudaEnabledDeviceCount();
if (num_devices < 2)
{
cout << "Two or more GPUs are required\n";
return -1;
}
cuSafeCall(cuInit(0));
for (int i = 0; i < num_devices; ++i)
{
if (!DeviceInfo(i).isCompatible())
{
cout << "GPU module isn't built for GPU #" << i << " (" << DeviceInfo(i).name() << ")";
return -1;
}
}
// Create context for the first GPU
safeCall(cuInit(0));
// Create context for GPU #0
CUdevice device;
cuSafeCall(cuDeviceGet(&device, 0));
cuSafeCall(cuCtxCreate(&contexts[0], 0, device));
safeCall(cuDeviceGet(&device, 0));
safeCall(cuCtxCreate(&contexts[0], 0, device));
CUcontext prev_context;
cuSafeCall(cuCtxPopCurrent(&prev_context));
safeCall(cuCtxPopCurrent(&prev_context));
// Create context for the second GPU
cuSafeCall(cuDeviceGet(&device, 1));
cuSafeCall(cuCtxCreate(&contexts[1], 0, device));
// Create context for GPU #1
safeCall(cuDeviceGet(&device, 1));
safeCall(cuCtxCreate(&contexts[1], 0, device));
cuSafeCall(cuCtxPopCurrent(&prev_context));
safeCall(cuCtxPopCurrent(&prev_context));
// Execute calculation in two threads using two GPUs
int devices[] = {0, 1};
@@ -81,8 +93,8 @@ int main()
void Worker::operator()(int device_id) const
{
// Set proper context
cuSafeCall(cuCtxPushCurrent(contexts[device_id]));
// Set the proper context
safeCall(cuCtxPushCurrent(contexts[device_id]));
Mat src(1000, 1000, CV_32F);
Mat dst;
@@ -93,15 +105,15 @@ void Worker::operator()(int device_id) const
// CPU works
transpose(src, dst);
// GPU works
GpuMat d_src(src);
GpuMat d_dst;
// GPU works
transpose(d_src, d_dst);
// Check results
bool passed = norm(dst - Mat(d_dst), NORM_INF) < 1e-3;
cout << "GPU #" << device_id << ": "<< (passed ? "passed" : "FAILED") << endl;
cout << "GPU #" << device_id << " (" << DeviceInfo().name() << "): "
<< (passed ? "passed" : "FAILED") << endl;
// Deallocate data here, otherwise deallocation will be performed
// after context is extracted from the stack
@@ -109,14 +121,14 @@ void Worker::operator()(int device_id) const
d_dst.release();
CUcontext prev_context;
cuSafeCall(cuCtxPopCurrent(&prev_context));
safeCall(cuCtxPopCurrent(&prev_context));
}
void destroyContexts()
{
cuSafeCall(cuCtxDestroy(contexts[0]));
cuSafeCall(cuCtxDestroy(contexts[1]));
safeCall(cuCtxDestroy(contexts[0]));
safeCall(cuCtxDestroy(contexts[1]));
}
#endif