openmpi 2.: MPI_Wtick returns 10e-9, not 10e-6

[ccaamad]

Hi,

The man page for MPI_Wtick claims that it should return 10e-6 on POSIX platforms. I've noticed that, at least on my system (centos7, x86_64), openmpi 2.0.1 returns 10e-9.

Is this intentional - should the man page be updated?

Cheers,

Mark

[bosilca]

The MPI time accuracy depends on your processor and OS, and also the fact that you ask for a monotonic time or not. You are right, the man page should be updated to reflect this flexibility.