source: src/Common/Stats/Time.cc @ 5c216b4

//
// Cforall Version 1.0.0 Copyright (C) 2019 University of Waterloo
//
// The contents of this file are covered under the licence agreement in the
// file "LICENCE" distributed with Cforall.
//
// Time.cc --
//
// Author           : Thierry Delisle
// Created On       : Mon Mar 04 15:16:07 2019
// Last Modified By :
// Last Modified On :
// Update Count     :
//

#include "Time.h"

#include <cassert>
#include <chrono>
#include <cstdint>
#include <cstring>
#include <iostream>
#include <iomanip>
#include <stack>

namespace Stats {
        namespace Time {
#               if !defined(NO_TIME_STATISTICS)
                        extern bool enabled;

                        Base::TreeTop top;

                        typedef  std::chrono::time_point<std::chrono::high_resolution_clock> point_t;
                        std::chrono::duration<double> total;

                        point_t global_begin;

                        int prevl = 0;
                        int currl = 0;

                        template<typename T>
                        static inline std::ostream & operator<<(std::ostream & os, const std::chrono::duration<T> & dd) {
                                auto d = std::chrono::duration_cast<std::chrono::milliseconds>(dd);
                                auto minutes = std::chrono::duration_cast<std::chrono::minutes>(d);
                                auto seconds = std::chrono::duration_cast<std::chrono::seconds>(d % std::chrono::minutes(1));
                                auto millis  = std::chrono::duration_cast<std::chrono::milliseconds>(d % std::chrono::seconds(1));

                                bool zmin = minutes == minutes.zero();
                                bool zsec = seconds == seconds.zero();
                                bool zmil = millis  == millis .zero();

                                if(!zmin) {
                                        os << std::setw(4) << minutes.count() << "m";
                                } else {
                                        os << std::string(5, ' ');
                                }

                                if(!zmin || !zsec) {
                                        if(!zmin) os << std::setfill('0');
                                        os << std::setw(2) << seconds.count() << "s";
                                } else {
                                        os << std::string(3, ' ');
                                }
                                os << std::setfill(' ');

                                if(!zmin || !zsec || !zmil) {
                                        if(!zmin || !zsec) os << std::setfill('0');
                                        os << std::setw(3) << millis .count();
                                } else {
                                        os << std::string(4, ' ');
                                }
                                os << std::setfill(' ');

                                return os;
                        }

                        class TimerNode : public Base::Tree<top> {
                        public:
                                TimerNode(const char * const name )
                                        : Base::Tree<top>(name)
                                {}

                                TimerNode(const char * const name, Base::Tree<top> * parent)
                                        : Base::Tree<top>(name, parent)

                                {}

                                virtual void print(std::ostream & os) override {
                                        if(currl > prevl) {
                                                parents.push(last);
                                        }
                                        for(auto lvl = prevl - currl; lvl > 0; lvl--) {
                                                parents.pop();
                                        }
                                        last = end - begin;

                                        assert(finished);
                                        std::chrono::duration<double> diff = end - begin;
                                        os << diff << " | ";
                                        if(parents.empty()) {
                                                os << "     N/A | ";
                                        } else {
                                                os << std::setw(7) << std::setprecision(0);
                                                os << size_t(100.0 * diff.count() / parents.top().count()) << "% | ";
                                        }
                                        os << std::setw(5) << std::setprecision(0);
                                        os << size_t(100.0 * diff.count() / total.count()) << "% ";
                                }

                                void start() {
                                        begin = std::chrono::high_resolution_clock::now();
                                }

                                void finish() {
                                        end = std::chrono::high_resolution_clock::now();
                                        finished = true;
                                }

                        protected:
                                virtual ~TimerNode() = default;

                        private:
                                bool finished = false;

                                point_t begin;
                                point_t end;

                                static std::chrono::duration<double> last;
                                static std::stack<std::chrono::duration<double>> parents;
                        };

                        std::stack<TimerNode *> nodes;

                        std::chrono::duration<double> TimerNode::last;
                        std::stack<std::chrono::duration<double>> TimerNode::parents;

                        void StartGlobal() {
                                global_begin = std::chrono::high_resolution_clock::now();
                        }

                        void StartBlock(const char * const name) {
                                if(!enabled) return;
                                auto node = nodes.empty()
                                        ? new TimerNode(name)
                                        : new TimerNode(name, nodes.top());

                                nodes.push(node);
                                node->start();
                        }

                        void StopBlock() {
                                if(!enabled) return;
                                nodes.top()->finish();
                                nodes.pop();
                        }

                        void print() {
                                if(!top.head) return;
                                auto global_end = std::chrono::high_resolution_clock::now();
                                total = global_end - global_begin;

                                size_t nc = 0;
                                Base::ForAll(top, 0, [&](Base::TreeImpl * node, size_t level) {
                                        nc = std::max(nc, (4 * level) + std::strlen(node->name));
                                });

                                size_t nct = nc + 37;
                                std::cerr << std::string(nct, '=') << std::endl;
                                const char * const title = "Timing Results";
                                std::cerr << std::string((nct - std::strlen(title)) / 2, ' ');
                                std::cerr << title << std::endl;
                                std::cerr << std::string(nct, '-') << std::endl;
                                std::cerr << "Location";
                                std::cerr << std::string(nc - (std::strlen("Location")), ' ');
                                std::cerr << " | ";
                                std::cerr << "       Time | ";
                                std::cerr << "% parent | ";
                                std::cerr << "% total |" << std::endl;
                                std::cerr << std::string(nct, '-') << std::endl;

                                Base::ForAll(top, 0, [&](Base::TreeImpl * node, size_t level) {
                                        currl = level;
                                        std::cerr << std::string(level * 4, ' ');
                                        std::cerr << node->name;
                                        std::cerr << std::string(nc - ((level * 4) + std::strlen(node->name)), ' ');
                                        std::cerr << " | ";
                                        node->print(std::cerr);
                                        std::cerr << " |";
                                        std::cerr << '\n';
                                        prevl = level;
                                }, true);

                                std::cerr << std::string(nct, '-') << std::endl;
                                std::cerr << "Total " << total << std::endl;
                                std::cerr << std::string(nct, '-') << std::endl;
                        }
#               endif
        }
}