horometer.h

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// $Id$
// Author: John Wu <John.Wu at ACM.org>
// Copyright 2000-2009 the Regents of the University of California
#ifndef IBIS_HOROMETER_H
#define IBIS_HOROMETER_H
#include <stdio.h>
#include <time.h> // clock, clock_gettime
#if defined(sun) || defined(linux) || defined(__HOS_AIX__) || \
    defined(__CYGWIN__) || defined(__APPLE__) || defined(__FreeBSD__)
#   include <limits.h> // CLK_TCK
#   include <sys/time.h> // gettimeofday, timeval
#   include <sys/times.h> // times, struct tms
#   include <sys/resource.h> // getrusage
#   ifndef RUSAGE_SELF
#       define RUSAGE_SELF 0
#   endif
#   ifndef RUSAGE_CHILDREN
#       define RUSAGE_CHILDRED -1
#   endif
#elif defined(CRAY)
#   include <sys/times.h> // times
#elif defined(sgi)
#   include <limits.h> // CLK_TCK
#   define RUSAGE_SELF      0         /* calling process */
#   define RUSAGE_CHILDREN  -1        /* terminated child processes */
#   include <sys/times.h> // times
//#   include <sys/types.h> // struct tms
#   include <sys/time.h> // gettimeofday, getrusage
#   include <sys/resource.h> // getrusage
#elif defined(__MINGW32__)
#   include <limits.h> // CLK_TCK
#   include <sys/time.h> // gettimeofday, timeval
#elif defined(_WIN32)
#   include <windows.h>
#elif defined(VMS)
#   include <unistd.h>
#endif

namespace ibis {
    class horometer;
}

class ibis::horometer {
public:
    horometer() : startRealTime(0), totalRealTime(0),
                  startCPUTime(0), totalCPUTime(0) {
#if defined(_WIN32) && defined(_MSC_VER)
        // the frequency of the high-resolution performance counter
        LARGE_INTEGER lFrequency;
        BOOL ret = QueryPerformanceFrequency(&lFrequency);
        if (ret != 0 && lFrequency.QuadPart != 0)
            countPeriod = 1.0/static_cast<double>(lFrequency.QuadPart);
        else
            countPeriod = 0.0;
#endif
    };
    void start() {
        startRealTime = readWallClock();
        startCPUTime = readCPUClock();
        totalRealTime = 0.0;
        totalCPUTime = 0.0;
    };
    void stop() {
        double tmpr = readWallClock() - startRealTime;
        double tmpc = readCPUClock() - startCPUTime;
        if (tmpr > 0.0)
            totalRealTime += tmpr;
        if (tmpc > 0.0)
            totalCPUTime += tmpc;
    };
    void resume() {
        startRealTime = readWallClock();
        startCPUTime = readCPUClock();
    }
    double realTime() const {return totalRealTime;}
    double CPUTime() const {return totalCPUTime;}

private:
    double startRealTime;   // wall clock start time
    double totalRealTime;   // total real time
    double startCPUTime;    // cpu start time
    double totalCPUTime;    // total cpu time
#if defined(_WIN32) && defined(_MSC_VER)
    double countPeriod;     // time of one high-resolution count
#endif

    inline double readWallClock();
    inline double readCPUClock();
};

// read the system's wall clock time
inline double ibis::horometer::readWallClock() {
#if defined(CLOCK_REALTIME) && !defined(__CYGWIN__)
    struct timespec tb;
    if (0 == clock_gettime(CLOCK_REALTIME, &tb)) {
        return static_cast<double>(tb.tv_sec) + (1e-9 * tb.tv_nsec);
    }
    else {
        struct timeval cpt;
        gettimeofday(&cpt, 0);
        return static_cast<double>(cpt.tv_sec) + (1e-6 * cpt.tv_usec);
    }
#elif defined(HAVE_GETTIMEOFDAY) || defined(unix) || defined(CRAY) || \
    defined(linux) || defined(__HOS_AIX__) || defined(__APPLE__) || \
    defined(__FreeBSD__)
    struct timeval cpt;
    gettimeofday(&cpt, 0);
    return static_cast<double>(cpt.tv_sec) + (1e-6 * cpt.tv_usec);
#elif defined(_WIN32) && defined(_MSC_VER)
    double ret = 0.0;
    if (countPeriod != 0) {
        LARGE_INTEGER cnt;
        if (QueryPerformanceCounter(&cnt)) {
            ret = countPeriod * cnt.QuadPart;
        }
    }
    if (ret == 0.0) { // fallback option -- use GetSystemTime
        union {
            FILETIME ftFileTime;
            __int64  ftInt64;
        } ftRealTime;
        GetSystemTimeAsFileTime(&ftRealTime.ftFileTime);
        ret = (double) ftRealTime.ftInt64 * 1e-7;
    }
    return ret;
#elif defined(VMS)
    return (double) clock() * 0.001;
#else
    return (double) clock() / CLOCKS_PER_SEC;
#endif
} //  ibis::horometer::readWallClock

// read the value of the CPU clock time
inline double ibis::horometer::readCPUClock() {
#if defined(sun) || defined(sgi) || defined(linux) || defined(__APPLE__) \
    || defined(__HOS_AIX__) || defined(__CYGWIN__) || defined(__FreeBSD__)
    // on sun and linux, we can access getrusage to get more accurate time
    double time=0;
    struct rusage ruse;
    if (0 == getrusage(RUSAGE_SELF, &ruse)) {
        time = (ruse.ru_utime.tv_usec + ruse.ru_stime.tv_usec) * 1e-6 +
            ruse.ru_utime.tv_sec + ruse.ru_stime.tv_sec;
    }
    else {
        fputs("Warning -- horometer::readCPUClock(): getrusage failed "
              "on RUSAGE_SELF", stderr);
    }
    if (0 == getrusage(RUSAGE_CHILDREN, &ruse)) {
        time += (ruse.ru_utime.tv_usec + ruse.ru_stime.tv_usec) * 1e-6 +
            ruse.ru_utime.tv_sec + ruse.ru_stime.tv_sec;
    }
    else {
        fputs("Warning -- horometer::readCPUClock(): getrusage failed on "
              "RUSAGE_CHILDRED", stderr);
    }
    return time;
#elif defined(unix) || defined(CRAY)
#if defined(__STDC__)
    struct tms cpt;
    times(&cpt);
    return (cpt.tms_utime + cpt.tms_stime + cpt.tms_cutime +
            (double)cpt.tms_cstime) / CLK_TCK;
#else
    return (double) times() / CLK_TCK;
#endif
#elif defined(_WIN32)
    return (double) clock() / CLOCKS_PER_SEC;
#elif defined(VMS)
    return (double) clock() * 0.001;
#else
    return (double) clock() / CLOCKS_PER_SEC;
#endif
} // ibis::horometer::readCPUClock
#endif // IBIS_HOROMETER_H

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