TIP: Click on subject to list as thread! ANSI
echo: os2prog
to: Kirby Thornton
from: Patrick Haller
date: 1995-10-28 16:45:26
subject: Timing Algorithms.

Hi Kirby!

[..]
 KT>    I am currently taking an algorithm analysis course were we must
 KT> time different implementations.  
For really exact timing, you should have a look at:

int InfoTimer (void)
{
  QWORD   qwTime;
  APIRET  rc;
  ULONG   ulFreq;


  rc = DosTmrQueryFreq (&ulFreq);
  if (rc != NO_ERROR)
  {
    printf("\nDosTmrQueryFreq failed: %u", rc);
    return (rc);
  }

  if ((rc = DosTmrQueryTime(&qwTime)) != NO_ERROR)
  {
    printf("DosTmrQueryTime failed: %u\n", rc);
    return (rc);
  }
...

You get access to the internal 64-Bit timer with a resolution of 839ns.
     __
     |_)
cu/2 |atrick
[Team  OS/2]

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