Function gpu_areAnyNodesBoundToSameGpu

quest/src/gpu/gpu_config.cpp:394–417

bool gpu_areAnyNodesBoundToSameGpu() {
#if COMPILE_CUDA
    assert_gpuHasBeenBound(hasGpuBeenBound);

    if (!comm_isInit())
        return false;

    // obtain bound GPU's UUID; a unique identifier 16-char identifier
    auto uuidStr = getBoundGpuUuid();

    // we can repurpose string-to-root sending to collect all uuids
    auto allUuids = comm_gatherStringsToRoot(uuidStr.data(), uuidStr.size());
    auto uniqueUuids = std::set<std::string>(allUuids.begin(), allUuids.end());

    // and assess whether they're all unique (non-root's bools are overwritten)
    bool localGpusAreUnique = allUuids.size() == uniqueUuids.size();
    bool globalGpusAreUnique = comm_isTrueOnRootNode(localGpusAreUnique);
    return ! globalGpusAreUnique;

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


void gpu_sync() {