timing-irix.C

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 */


// $Id: timing-irix.C,v 1.7 2007/05/30 19:20:31 legendre Exp $

#include <invent.h>
#include <stdio.h>
#include <assert.h>
#include "common/h/timing.h"


double calcCyclesPerSecond_invent()
{
  if (setinvent() == -1) {
    return cpsMethodNotAvailable;
  }

  unsigned raw = 0;
  for (inventory_t *inv = getinvent(); inv != NULL; inv = getinvent()) {
    /* only need PROCESSOR/CPUBOARD inventory entries */
    if (inv->inv_class != INV_PROCESSOR) continue;
    if (inv->inv_type != INV_CPUBOARD) continue;
    /* check for clock speed mismatch */
    if (raw == 0) raw = inv->inv_controller;
    if (inv->inv_controller != raw) {
      fprintf(stderr, "!!! non-uniform CPU speeds\n");
      endinvent();
      return cpsMethodNotAvailable;
    }
  }
  endinvent();

  double cps = static_cast<double>(raw) * 1000000.0; // convert MHz to Hz
  return cps;
}

double calcCyclesPerSecondOS()
{
  double cps;
  cps = calcCyclesPerSecond_invent();
  if(cps == cpsMethodNotAvailable) {
     return 0;
  }
  return cps;
}