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Subject: [OMPI users] Unknown overhead in "mpirun -am ft-enable-cr"
From: Nguyen Toan (nguyentoan1508_at_[hidden])
Date: 2011-02-08 02:50:06


Hi all,

I am using the latest version of OpenMPI (1.5.1) and BLCR (0.8.2).
I found that when running an application,which uses MPI_Isend, MPI_Irecv and
MPI_Wait,
enabling C/R, i.e using "-am ft-enable-cr", the application runtime is much
longer than the normal execution with mpirun (no checkpoint was taken).
This overhead becomes larger when the normal execution runtime is longer.
Does anybody have any idea about this overhead, and how to eliminate it?
Thanks.

Regards,
Nguyen