Function gpu_isGpuAvailable

quest/src/gpu/gpu_config.cpp:199–233

bool gpu_isGpuAvailable() {
#if COMPILE_CUDA

    int numDevices = gpu_getNumberOfLocalGpus();
    if (numDevices == 0)
        return false;

    // check if any reported device is a valid GPU
    for (int deviceInd=0; deviceInd < numDevices; deviceInd++) {

        // by checking the properties of each device
        struct cudaDeviceProp props;
        auto status = cudaGetDeviceProperties(&props, deviceInd);

        // if the query failed, device is anyway unusable; we do not
        // clear the error with clearPossibleCudaError() since this
        // can trigger an internal error when QuEST is GPU-compiled
        // but no valid GPU exists (hence no valid driver), like
        // occurs on cluster submission nodes
        if (status != cudaSuccess)
            continue;

        // if the device is a real GPU, it's 'major' compute capability is != 9999 (meaning emulation)
        if (props.major != 9999)
            return true;
    }

    // no non-emulation devices were found
    return false;

#else
    error_gpuQueriedButGpuNotCompiled();
    return false;
#endif
}


bool gpu_isDirectGpuCommPossible() {