timing-aix.C

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// $Id: timing-aix.C,v 1.10 2007/05/30 19:20:30 legendre Exp $
#include "common/h/timing.h"
#include <stdio.h>
#if defined(XLC) && defined(USE_PMAPI)
#include <pmapi.h>
#endif


double calcCyclesPerSecond_sys() {
  /* We have a function pm_cycles which returns the time in a double */
#if defined(USE_PMAPI)
  double cycles = pm_cycles();
#else
  double cycles = 0;
#endif

  // A bit of a hack: I've seen pm_cycles returning abnormally low values
  // (34 cps?) on AIX 5.1 machines. If this value isn't sensible, return
  // as MethodNotAvailable
  if (cycles < 1000) {
      cerr << "WARNING: pm_cycles returned nonsensical value of " << cycles
           << ", using default method to determine CPS." << endl;
      return cpsMethodNotAvailable;
  }
  if (cycles == 0.0)
    return cpsMethodNotAvailable;
  return cycles;
}

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