[mpich-discuss] MPI_WTime

Daniel Becker d.becker at fz-juelich.de
Sat Apr 19 07:38:16 CDT 2008

Dear MPICH team,

I am working at Research Center Juelich (Germany) and I am currently 
evaluating different methods to query clock values on cluster systems. 
Of course, MPI_Wtime() is one of the options a user has. I am interested 
how MPICH implements MPI_Wtime() on such cluster systems.

I guess that MPICH implements MPI_Wtime() in various ways accordingly to 
the detected system architecture. However, I assume that you have some 
kind of default mechanism within MPICH to calculate a return value of 
MPI_Wtime() on unknown systems. Moreover, I assume that this default 
mechanism relies on gettimeofday(). Are my assumptions correct or how is 
it done? Perhaps you also use NTP?

I am unsure whether this is the correct mailing list, but it would be 
great if you could help me. Thanks a lot for your help in advance :-).

Best regards,

Dipl.-Ing. Daniel Becker
Juelich Supercomputing Centre (JSC)
Forschungszentrum Jülich GmbH

Phone:  +49-2461-61-3650
Fax:    +49-2461-61-6656
E-mail: d.becker at fz-juelich.de

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