Timer Control

I_MPI_TIMER_KIND

Select the timer used by the MPI_Wtime and MPI_Wtick calls.

Syntax

I_MPI_TIMER_KIND=<timername>

Arguments

<timername>

Define the timer type

gettimeofday

If this setting is chosen, the MPI_Wtime and MPI_Wtick functions will work through the function gettimeofday(2). This is the default value

rdtsc

If this setting is chosen, the MPI_Wtime and MPI_Wtick functions will use the high resolution RDTSC timer

Description

Set this environment variable to select either the ordinary or RDTSC timer.

The resolution of the default gettimeofday(2) timer may be insufficient on certain platforms.