in cpp/src/kll_sketch_timing_profile_impl.hpp [40:141]
void kll_sketch_timing_profile<T>::run() {
const size_t lg_min_stream_len(0);
const size_t lg_max_stream_len(23);
const size_t ppo(16);
const size_t lg_max_trials(16);
const size_t lg_min_trials(6);
const size_t num_queries(20);
std::cout << "Stream\tTrials\tBuild\tUpdate\tQuant\tQuants\tRank\tCDF\tSer\tDeser\tItems\tSize" << std::endl;
size_t max_len = 1 << lg_max_stream_len;
std::vector<T> values(max_len);
std::vector<T> rank_query_values(num_queries);
for (size_t i = 0; i < num_queries; i++) rank_query_values[i] = sample();
std::sort(&rank_query_values[0], &rank_query_values[num_queries]);
double quantile_query_values[num_queries];
for (size_t i = 0; i < num_queries; i++) quantile_query_values[i] = distribution(generator);
size_t stream_length(1 << lg_min_stream_len);
while (stream_length <= (1 << lg_max_stream_len)) {
std::chrono::nanoseconds build_time_ns(0);
std::chrono::nanoseconds update_time_ns(0);
std::chrono::nanoseconds get_quantile_time_ns(0);
std::chrono::nanoseconds get_quantiles_time_ns(0);
std::chrono::nanoseconds get_rank_time_ns(0);
std::chrono::nanoseconds get_cdf_time_ns(0);
std::chrono::nanoseconds serialize_time_ns(0);
std::chrono::nanoseconds deserialize_time_ns(0);
size_t num_retained(0);
size_t size_bytes(0);
const size_t num_trials = get_num_trials(stream_length, lg_min_stream_len, lg_max_stream_len, lg_min_trials, lg_max_trials);
for (size_t i = 0; i < num_trials; i++) {
for (size_t i = 0; i < stream_length; i++) values[i] = sample();
auto start_build(std::chrono::high_resolution_clock::now());
kll_sketch<T> sketch;
auto finish_build(std::chrono::high_resolution_clock::now());
build_time_ns += std::chrono::duration_cast<std::chrono::nanoseconds>(finish_build - start_build);
auto start_update(std::chrono::high_resolution_clock::now());
for (size_t i = 0; i < stream_length; i++) sketch.update(values[i]);
auto finish_update(std::chrono::high_resolution_clock::now());
update_time_ns += std::chrono::duration_cast<std::chrono::nanoseconds>(finish_update - start_update);
auto start_get_quantile(std::chrono::high_resolution_clock::now());
for (size_t i = 0; i < num_queries; i++) sketch.get_quantile(quantile_query_values[i]);
auto finish_get_quantile(std::chrono::high_resolution_clock::now());
get_quantile_time_ns += std::chrono::duration_cast<std::chrono::nanoseconds>(finish_get_quantile - start_get_quantile);
auto start_get_quantiles(std::chrono::high_resolution_clock::now());
sketch.get_quantiles(quantile_query_values, num_queries);
auto finish_get_quantiles(std::chrono::high_resolution_clock::now());
get_quantiles_time_ns += std::chrono::duration_cast<std::chrono::nanoseconds>(finish_get_quantiles - start_get_quantiles);
auto start_get_rank(std::chrono::high_resolution_clock::now());
for (size_t i = 0; i < num_queries; i++) {
volatile double rank = sketch.get_rank(rank_query_values[i]); // volatile to prevent this from being optimized away
}
auto finish_get_rank(std::chrono::high_resolution_clock::now());
get_rank_time_ns += std::chrono::duration_cast<std::chrono::nanoseconds>(finish_get_rank - start_get_rank);
auto start_get_cdf(std::chrono::high_resolution_clock::now());
sketch.get_CDF(rank_query_values.data(), num_queries);
auto finish_get_cdf(std::chrono::high_resolution_clock::now());
get_cdf_time_ns += std::chrono::duration_cast<std::chrono::nanoseconds>(finish_get_cdf - start_get_cdf);
std::stringstream s(std::ios::in | std::ios::out | std::ios::binary);
auto start_serialize(std::chrono::high_resolution_clock::now());
sketch.serialize(s);
auto finish_serialize(std::chrono::high_resolution_clock::now());
serialize_time_ns += std::chrono::duration_cast<std::chrono::nanoseconds>(finish_serialize - start_serialize);
auto start_deserialize(std::chrono::high_resolution_clock::now());
auto deserialized_sketch = kll_sketch<T>::deserialize(s);
auto finish_deserialize(std::chrono::high_resolution_clock::now());
deserialize_time_ns += std::chrono::duration_cast<std::chrono::nanoseconds>(finish_deserialize - start_deserialize);
num_retained += sketch.get_num_retained();
size_bytes += s.tellp();
}
std::cout << stream_length << "\t"
<< num_trials << "\t"
<< (double) build_time_ns.count() / num_trials << "\t"
<< (double) update_time_ns.count() / num_trials / stream_length << "\t"
<< (double) get_quantile_time_ns.count() / num_trials / num_queries << "\t"
<< (double) get_quantiles_time_ns.count() / num_trials / num_queries << "\t"
<< (double) get_rank_time_ns.count() / num_trials / num_queries << "\t"
<< (double) get_cdf_time_ns.count() / num_trials / num_queries << "\t"
<< (double) serialize_time_ns.count() / num_trials << "\t"
<< (double) deserialize_time_ns.count() / num_trials << "\t"
<< num_retained / num_trials << "\t"
<< size_bytes / num_trials << std::endl;
stream_length = pwr_2_law_next(ppo, stream_length);
}
}