Newsgroups: comp.parallel.mpi
From: lwilson@startrek.dartmouth.edu (Linda F. Wilson)
Subject: ? on MPI_Wtick()
Organization: Dartmouth College
Date: 6 Dec 1996 16:15:29 GMT
Message-ID: <589gr2$vut@dartvax.dartmouth.edu>

I'm a new user of LAM 6.1.  I understand that
MPI_Wtick() is used to determine the resolution
of times (in seconds) obtained by MPI_Wtime().  
I imagine that MPI_Wtick() depends on some system 
counter.  

On an SGI Indy, subsequent calls to MPI_Wtick()
gave me the following results:

Res = 0.000053
Res = 0.000051
Res = 0.033937
Res = 0.000052
Res = 0.000168

What accounts for the variability?  A time of
0.00005 would correspond to a clock of 20 KHz.
How should I interpret this?

Thanks,

Linda
-- 
Prof. Linda F. Wilson
Thayer School of Engineering
Dartmouth College, Hanover, NH
Linda.Wilson@dartmouth.edu

