Function gpu_getMaxNumConcurrentThreads

quest/src/gpu/gpu_config.cpp:307–325

qindex gpu_getMaxNumConcurrentThreads() {
#if COMPILE_CUDA
    assert_gpuHasBeenBound(hasGpuBeenBound);

    int deviceId = getBoundGpuId();

    // this may differ between nodes (which have different GPUs), which is fine
    int maxThreadsPerBlock;
    int maxNumBlocks;
    CUDA_CHECK( cudaDeviceGetAttribute(&maxThreadsPerBlock, cudaDevAttrMaxThreadsPerBlock,  deviceId) );
    CUDA_CHECK( cudaDeviceGetAttribute(&maxNumBlocks,       cudaDevAttrMultiProcessorCount, deviceId) );

    return maxThreadsPerBlock * static_cast<qindex>(maxNumBlocks); // avoid overflow

#else
    error_gpuQueriedButGpuNotCompiled();
    return -1;
#endif
}