timing-linux.C

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// $Id: timing-linux.C,v 1.7 2007/05/30 19:20:32 legendre Exp $
#include <stdio.h>
#include "common/h/timing.h"


// TODO: replace body with (better) platform-specific code

double calcCyclesPerSecond_sys() {
  FILE *cpuinfo_f = fopen( "/proc/cpuinfo", "r" );
  if(cpuinfo_f == NULL)  return cpsMethodNotAvailable;

  while(!feof(cpuinfo_f)) {
    char strbuf[150];
    char *res = fgets(strbuf, 148, cpuinfo_f);
    double cpumhz = 0.0;
    if(res != NULL) {
      int totassigned = sscanf(res, "cpu MHz : %lf",&cpumhz);
      if(totassigned == 1) {
         fclose(cpuinfo_f);
         return cpumhz*1000000.0;
      }
    }
  }
  fclose(cpuinfo_f);
  return cpsMethodNotAvailable;
}

double calcCyclesPerSecondOS()
{
  double cps;
  cps = calcCyclesPerSecond_sys();
  if(cps == cpsMethodNotAvailable) {
     return 0.0;
  }
  return cps;
}