Function main

perf/perf_reduce_by_key.cpp:47–114

} UniqueKey;

int main(int argc, char *argv[])
{
    perf_parse_args(argc, argv);

    std::cout << "size: " << PERF_N << std::endl;

    // setup context and queue for the default device
    boost::compute::device device = boost::compute::system::default_device();
    boost::compute::context context(device);
    boost::compute::command_queue queue(context, device);
    std::cout << "device: " << device.name() << std::endl;

    // create vector of keys and random values
    std::vector<int> host_keys(PERF_N);
    std::vector<int> host_values(PERF_N);
    std::generate(host_keys.begin(), host_keys.end(), UniqueKey);
    std::generate(host_values.begin(), host_values.end(), rand_int);

    // create vectors for keys and values on the device and copy the data
    boost::compute::vector<int> device_keys(PERF_N, context);
    boost::compute::vector<int> device_values(PERF_N,context);
    boost::compute::copy(
        host_keys.begin(),
        host_keys.end(),
        device_keys.begin(),
        queue
    );
    boost::compute::copy(
        host_values.begin(),
        host_values.end(),
        device_values.begin(),
        queue
    );

    // vectors for the results
    boost::compute::vector<int> device_keys_results(PERF_N, context);
    boost::compute::vector<int> device_values_results(PERF_N,context);

    typedef boost::compute::vector<int>::iterator iterType;
    std::pair<iterType, iterType> result(
        device_keys_results.begin(),
        device_values_results.begin()
    );

    // reduce by key
    perf_timer t;
    for(size_t trial = 0; trial < PERF_TRIALS; trial++){
        t.start();
        result = boost::compute::reduce_by_key(device_keys.begin(),
                                               device_keys.end(),
                                               device_values.begin(),
                                               device_keys_results.begin(),
                                               device_values_results.begin(),
                                               queue);
        t.stop();
    }
    std::cout << "time: " << t.min_time() / 1e6 << " ms" << std::endl;