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// ==================================================================== //
// //
// File : perf_timer.h //
// Purpose : Simple performance timer using clock() //
// //
// //
// Coded by Ralf Westram (coder@reallysoft.de) in November 2004 //
// Copyright Department of Microbiology (Technical University Munich) //
// //
// Visit our web site at: http://www.arb-home.de/ //
// //
// ==================================================================== //
#ifndef PERF_TIMER_H
#define PERF_TIMER_H
#ifndef _GLIBCXX_STRING
#include <string>
#endif
#ifndef _GLIBCXX_CSTDIO
#include <cstdio>
#endif
#ifndef _GLIBCXX_CTIME
#include <ctime>
#endif
class PerfTimer {
clock_t started_at;
unsigned long loop_counter;
std::string message;
public:
PerfTimer(const std::string& message_)
: started_at(clock())
, loop_counter(0)
, message(message_)
{}
~PerfTimer() {
clock_t stopped_at = clock();
clock_t ticks = stopped_at-started_at;
double seconds = double(ticks)/CLOCKS_PER_SEC;
printf("Time for '%s': ticks=%lu (= %5.2f seconds)",
message.c_str(), ticks, seconds);
if (loop_counter > 0) { // loop timer
if (loop_counter == 1) {
printf(" 1 loop");
}
else {
double lticks = double(ticks)/loop_counter;
double lseconds = lticks/CLOCKS_PER_SEC;
printf(" %lu loops. Each took: ticks=%lu",
loop_counter, (clock_t)(lticks+0.5));
if (lseconds >= 0.01) {
printf(" (= %5.2f seconds)", lseconds);
}
else {
printf(" (= %5.2f milliseconds)", lseconds/1000);
}
double loopsPerSecond = loop_counter/seconds;
printf(" = %5.2f loops/second", loopsPerSecond);
}
}
printf("\n");
}
void announceLoop() { loop_counter++; }
};
#else
#error perf_timer.h included twice
#endif // PERF_TIMER_H
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