timing.cpp

 
#include <time.h>
#include <chrono>
 
#include "defs.h"
 
//////////////////////////////////////////////////////////////////
/// Time related routines (runtime - timing - timelimit)
/// Check timing.h for details
//////////////////////////////////////////////////////////////////
 
#include "com_mpi.h"
 
namespace hila {
 
// This stores the start time of the program
static double start_time = -1.0;
 
/////////////////////////////////////////////////////////////////
/// Timer routines - for high-resolution event timing
/////////////////////////////////////////////////////////////////
 
// store all timers in use
std::vector<timer *> timer_list = {};
 
// initialize timer to this timepoint
void timer::init(const char *tag) {
    if (tag != nullptr)
        label = tag;
    reset();
    // Store it on 1st use!
}
 
// remove the timer also from the list
void timer::remove() {
    for (auto it = timer_list.begin(); it != timer_list.end(); ++it) {
        if (*it == this) {
            timer_list.erase(it);
            return;
        }
    }
}
 
void timer::reset() {
    t_start = t_total = 0.0;
    count = 0;
    is_on = is_error = false;
}
 
void timer::error() {
    if (!is_error) {
        hila::out0 << " **** Timer '" << label
                   << "' error, unbalanced start/stop.  Removing from statistics\n";
    }
    is_error = true;
}
 
double timer::start() {
    if (is_on)
        error();
    is_on = true;
 
    // Move storing the timer ptr here, because if timer is initialized
    // in the global scope the timer_list is possibly initialized later!
    if (count == 0) {
        timer_list.push_back(this);
    }
 
#ifdef GPU_SYNCHRONIZE_TIMERS
    gpuStreamSynchronize(0);
#endif
 
    t_start = hila::gettime();
    return t_start;
}
 
double timer::stop() {
    if (!is_on)
        error();
    is_on = false;
 
#ifdef GPU_SYNCHRONIZE_TIMERS
    gpuStreamSynchronize(0);
#endif
 
    double e = hila::gettime();
    t_total += (e - t_start);
    count++;
    return e;
}
 
timer_value timer::value() {
    timer_value r;
    r.time = t_total;
    r.count = count;
    return r;
}
 
void timer::report(bool print_not_timed) {
    if (hila::myrank() == 0) {
        char line[202];
 
        // time used during the counter activity
        double ttime = gettime();
        if (count > 0 && !is_error) {
            if (t_total / count > 0.1) {
                std::snprintf(line, 200, "%-20s: %14.3f %14ld %10.3f s  %8.4f\n", label.c_str(),
                              t_total, (long)count, t_total / count, t_total / ttime);
            } else if (t_total / count > 1e-4) {
                std::snprintf(line, 200, "%-20s: %14.3f %14ld %10.3f ms %8.4f\n", label.c_str(),
                              t_total, (long)count, 1e3 * t_total / count, t_total / ttime);
            } else {
                std::snprintf(line, 200, "%-20s: %14.3f %14ld %10.3f μs %8.4f\n", label.c_str(),
                              t_total, (long)count, 1e6 * t_total / count, t_total / ttime);
            }
            hila::out << line;
        } else if (!is_error && print_not_timed) {
            std::snprintf(line, 200, "%-20s: no timed calls made\n", label.c_str());
            hila::out << line;
        } else if (is_error) {
            std::snprintf(line, 200, "%-20s: error:unbalanced start/stop\n", label.c_str());
            hila::out << line;
        }
    }
}
 
void report_timers() {
    if (hila::myrank() == 0) {
        if (timer_list.size() > 0) {
 
#if defined(CUDA) || defined(HIP)
#if defined(GPU_SYNCHRONIZE_TIMERS)
            hila::out << "TIMERS: synchronized to GPU kernel execution (GPU_SYNCHRONIZE_TIMERS "
                         "defined)\n";
#else
            hila::out << "TIMERS: GPU_SYNCHRONIZE_TIMERS not defined, fine-grained timing "
                         "likely to be incorrect\n";
#endif
#endif
 
            hila::out << "TIMER REPORT:             total(sec)          calls     "
                         "time/call  fraction\n";
            hila::out << "------------------------------------------------------------"
                         "---------------\n";
 
            for (auto tp : timer_list) {
                tp->report();
            }
 
            hila::out << "------------------------------------------------------------"
                         "---------------\n";
        } else {
            hila::out << "No timers defined\n";
        }
    }
}
 
/////////////////////////////////////////////////////////////////
/// Use clock_gettime() to get the accurate time
/// (alternative: use gettimeofday()  or MPI_Wtime())
/// gettime returns the time in secs since program start
 
double gettime() {
    struct timespec tp;
 
    if (start_time == -1.0)
        inittime();
 
    clock_gettime(CLOCK_MONOTONIC, &tp);
    return (((double)tp.tv_sec - start_time) + 1.0e-9 * (double)tp.tv_nsec);
}
 
void inittime() {
    if (start_time == -1.0) {
        start_time = 0.0;
        start_time = gettime();
    }
}
 
//////////////////////////////////////////////////////////////////
/// Routines for checking remaining cpu-time
/// time_to_exit() is called periodically on a point where exit can be done.
/// It uses the max of the time intervals for the estimate for one further round.
/// If not enough time returns true, else false
///
 
static double timelimit = 0;
 
void setup_timelimit(long seconds) {
    timelimit = (double)seconds;
}
 
bool time_to_exit() {
    static double max_interval = 0.0;
    static double previous_time = 0.0;
    bool finish;
 
    // if no time limit set
    if (timelimit == 0.0)
        return false;
 
    if (hila::myrank() == 0) {
        double this_time = gettime();
        if (this_time - previous_time > max_interval)
            max_interval = this_time - previous_time;
        previous_time = this_time;
 
        // Give 5 min margin for the exit - perhaps needed for writing etc.
        if (timelimit - this_time < max_interval + 5 * 60.0)
            finish = true;
        else
            finish = false;
 
        hila::out << "TIMECHECK: " << this_time << "s used, " << timelimit - this_time
                  << "s remaining\n";
        if (finish)
            hila::out << "CPU TIME LIMIT, EXITING THE PROGRAM\n";
    }
    hila::broadcast(finish);
    return finish;
}
 
/*****************************************************
 * Time stamp
 */
 
void timestamp(const char *msg) {
    if (hila::myrank() == 0) {
        int p = hila::out0.precision();
        std::time_t ct = std::time(NULL);
        if (msg != NULL)
            hila::out << msg;
        std::string d = ctime(&ct);
        d.resize(d.size() - 1); // take away \n at the end
        hila::out0 << " -- date " << d << "  run time " << std::setprecision(4) << hila::gettime()
                   << "s" << std::endl;
        hila::out0.precision(p);
        hila::out0.flush();
    }
}
 
void timestamp(const std::string &msg) {
    hila::timestamp(msg.c_str());
}
 
} // namespace hila