96 lines
2.7 KiB
C++
96 lines
2.7 KiB
C++
#ifndef OSRM_UTIL_TIMED_HISTOGRAM_HPP
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#define OSRM_UTIL_TIMED_HISTOGRAM_HPP
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#include "util/integer_range.hpp"
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#include <algorithm>
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#include <atomic>
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#include <mutex>
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#include <sstream>
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#include <vector>
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namespace osrm::util
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{
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namespace detail
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{
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extern std::atomic_uint operation;
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} // namespace detail
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/**
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* Captures a histogram with a bin size of `IndexBinSize` every `TimeBinSize` count operations.
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*/
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template <std::size_t TimeBinSize = 1000, std::size_t IndexBinSize = 1000> class TimedHistogram
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{
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public:
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void Count(std::size_t pos)
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{
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std::lock_guard<std::mutex> guard(frames_lock);
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auto frame_index = detail::operation++ / TimeBinSize;
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while (frame_offsets.size() <= frame_index)
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{
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frame_offsets.push_back(frame_counters.size());
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}
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BOOST_ASSERT(frame_offsets.size() == frame_index + 1);
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auto frame_offset = frame_offsets.back();
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auto counter_index = frame_offset + pos / IndexBinSize;
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while (counter_index >= frame_counters.size())
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{
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frame_counters.push_back(0);
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}
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BOOST_ASSERT(frame_counters.size() > counter_index);
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frame_counters[counter_index]++;
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}
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// Returns the measurments as a CSV file with the columns:
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// frame_id,index_bin,count
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std::string DumpCSV() const
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{
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std::stringstream out;
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const auto print_bins = [&out](auto frame_index, auto begin, auto end)
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{
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auto bin_index = 0;
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std::for_each(begin,
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end,
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[&](const auto count)
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{
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if (count > 0)
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{
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out << (frame_index * TimeBinSize) << ","
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<< (bin_index * IndexBinSize) << "," << count << std::endl;
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}
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bin_index++;
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});
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};
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if (frame_offsets.size() == 0)
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{
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return "";
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}
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for (const auto frame_index : irange<std::size_t>(0, frame_offsets.size() - 1))
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{
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auto begin = frame_counters.begin() + frame_offsets[frame_index];
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auto end = frame_counters.begin() + frame_offsets[frame_index + 1];
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print_bins(frame_index, begin, end);
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}
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print_bins(frame_offsets.size() - 1,
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frame_counters.begin() + frame_offsets.back(),
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frame_counters.end());
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return out.str();
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}
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private:
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std::mutex frames_lock;
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std::vector<std::uint32_t> frame_offsets;
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std::vector<std::uint32_t> frame_counters;
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};
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} // namespace osrm::util
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#endif
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