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6d6f3bc58b
There are no viable constructors for the atomic in rapidJSON.
178 lines
5.0 KiB
C++
178 lines
5.0 KiB
C++
#include "Stats.h"
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#include <iostream>
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#include <rapidjson/document.h>
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#include <rapidjson/rapidjson.h>
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#include <rapidjson/writer.h>
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#include <rapidjson/stringbuffer.h>
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void Stats::StatsCollector::add(uint64_t microseconds, size_t requests_inc, size_t bytes_inc)
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{
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work_time += microseconds;
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requests += requests_inc;
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requests_bytes += bytes_inc;
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sampler.insert(microseconds);
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}
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void Stats::addRead(uint64_t microseconds, size_t requests_inc, size_t bytes_inc)
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{
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read_collector.add(microseconds, requests_inc, bytes_inc);
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}
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void Stats::addWrite(uint64_t microseconds, size_t requests_inc, size_t bytes_inc)
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{
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write_collector.add(microseconds, requests_inc, bytes_inc);
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}
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void Stats::StatsCollector::clear()
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{
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requests = 0;
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work_time = 0;
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requests_bytes = 0;
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sampler.clear();
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}
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void Stats::clear()
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{
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read_collector.clear();
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write_collector.clear();
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}
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std::pair<double, double> Stats::StatsCollector::getThroughput(size_t concurrency)
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{
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assert(requests != 0);
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double seconds = work_time / 1'000'000.0 / concurrency;
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return {requests / seconds, requests_bytes / seconds};
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}
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double Stats::StatsCollector::getPercentile(double percent)
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{
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return sampler.quantileNearest(percent / 100.0) / 1000.0;
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}
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void Stats::report(size_t concurrency)
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{
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std::cerr << "\n";
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const auto & read_requests = read_collector.requests;
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const auto & write_requests = write_collector.requests;
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/// Avoid zeros, nans or exceptions
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if (0 == read_requests && 0 == write_requests)
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return;
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auto [read_rps, read_bps] = read_collector.getThroughput(concurrency);
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auto [write_rps, write_bps] = write_collector.getThroughput(concurrency);
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std::cerr << "read requests " << read_requests << ", write requests " << write_requests << ", ";
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if (errors)
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std::cerr << "errors " << errors << ", ";
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if (0 != read_requests)
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{
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std::cerr
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<< "Read RPS: " << read_rps << ", "
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<< "Read MiB/s: " << read_bps / 1048576;
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if (0 != write_requests)
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std::cerr << ", ";
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}
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if (0 != write_requests)
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{
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std::cerr
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<< "Write RPS: " << write_rps << ", "
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<< "Write MiB/s: " << write_bps / 1048576 << ". "
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<< "\n";
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}
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std::cerr << "\n";
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auto print_percentile = [&](double percent, Stats::StatsCollector & collector)
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{
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std::cerr << percent << "%\t\t";
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std::cerr << collector.getPercentile(percent) << " msec.\t";
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std::cerr << "\n";
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};
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const auto print_all_percentiles = [&](auto & collector)
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{
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for (int percent = 0; percent <= 90; percent += 10)
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print_percentile(percent, collector);
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print_percentile(95, collector);
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print_percentile(99, collector);
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print_percentile(99.9, collector);
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print_percentile(99.99, collector);
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};
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if (0 != read_requests)
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{
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std::cerr << "Read sampler:\n";
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print_all_percentiles(read_collector);
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}
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if (0 != write_requests)
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{
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std::cerr << "Write sampler:\n";
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print_all_percentiles(write_collector);
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}
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}
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void Stats::writeJSON(DB::WriteBuffer & out, size_t concurrency, int64_t start_timestamp)
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{
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using namespace rapidjson;
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Document results;
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auto & allocator = results.GetAllocator();
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results.SetObject();
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results.AddMember("timestamp", Value(start_timestamp), allocator);
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const auto get_results = [&](auto & collector)
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{
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Value specific_results(kObjectType);
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specific_results.AddMember("total_requests", Value(static_cast<uint64_t>(collector.requests)), allocator);
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auto [rps, bps] = collector.getThroughput(concurrency);
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specific_results.AddMember("requests_per_second", Value(rps), allocator);
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specific_results.AddMember("bytes_per_second", Value(bps), allocator);
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Value percentiles(kArrayType);
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const auto add_percentile = [&](double percent)
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{
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Value percentile(kObjectType);
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Value percent_key(fmt::format("{:.2f}", percent).c_str(), allocator);
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percentile.AddMember(percent_key, Value(collector.getPercentile(percent)), allocator);
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percentiles.PushBack(percentile, allocator);
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};
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for (int percent = 0; percent <= 90; percent += 10)
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add_percentile(percent);
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add_percentile(95);
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add_percentile(99);
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add_percentile(99.9);
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add_percentile(99.99);
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specific_results.AddMember("percentiles", percentiles, allocator);
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return specific_results;
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};
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if (read_collector.requests != 0)
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results.AddMember("read_results", get_results(read_collector), results.GetAllocator());
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if (write_collector.requests != 0)
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results.AddMember("write_results", get_results(write_collector), results.GetAllocator());
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StringBuffer strbuf;
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strbuf.Clear();
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Writer<StringBuffer> writer(strbuf);
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results.Accept(writer);
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const char * output_string = strbuf.GetString();
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out.write(output_string, strlen(output_string));
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}
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