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ENH: Avoid repeated CUDA device selection queries #100

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Merged
SimonRit merged 1 commit into from
Jul 8, 2026
Merged

ENH: Avoid repeated CUDA device selection queries #100

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2 changes: 1 addition & 1 deletion include/itkCudaUtil.h
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Original file line number Diff line number Diff line change
Expand Up @@ -55,7 +55,7 @@ GetCudaComputeCapability(int device);
int
CudaGetAvailableDevices(std::vector<cudaDeviceProp> & devices);

/** Get the device that has the maximum FLOPS in the current context */
/** Get the device that has the maximum FLOPS in the current context. The result is cached for future calls. */
int
CudaGetMaxFlopsDev();

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15 changes: 12 additions & 3 deletions src/itkCudaUtil.cxx
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Expand Up @@ -69,18 +69,19 @@ CudaGetAvailableDevices(std::vector<cudaDeviceProp> & devices)
}

//
// Get the device that has the maximum FLOPS
// Compute the device that has the maximum FLOPS
//
int
CudaGetMaxFlopsDev()
ComputeMaxFlopsDevice()
{
std::vector<cudaDeviceProp> devices;
int numAvailableDevices = CudaGetAvailableDevices(devices);

if (numAvailableDevices == 0)
{

return -1;
}

int max_flops = 0;
int max_flops_device = 0;
for (int i = 0; i < numAvailableDevices; ++i)
Expand All @@ -98,6 +99,14 @@ CudaGetMaxFlopsDev()
return max_flops_device;
}

int
CudaGetMaxFlopsDev()
{
static const int max_flops_device = ComputeMaxFlopsDevice();

return max_flops_device;
}


std::pair<int, int>
GetCudaComputeCapability(int device)
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