Open MPI logo

Open MPI User's Mailing List Archives

  |   Home   |   Support   |   FAQ   |   all Open MPI User's mailing list

Subject: Re: [OMPI users] Performance issue of mpirun/mpi_init
From: Victor Vysotskiy (victor.vysotskiy_at_[hidden])
Date: 2014-04-10 10:58:23


Dear Ralph,

> it appears that 1.8 is much faster than 1.6.5 with the default settings, but slower when you set btl=tcp,self?

Precisely. However, with the default settings both versions are much slower compared to other MPI distributions such as MPICH, MVAPICH, and proprietary ones. The 'btl=tcp,self' setting substantially boost performance of 1.6.5 on single processor multi-core computers running under Linux, or Mac OS X. But it doesn't work in 1.8 anymore ...

> Is this a copy/paste error?

Unfortunately, it is not a copy/paste error.

> the next question is: how many nodes were in your allocation?

2 processes on a single machine running under Ubuntu Linux (laptop), or Mac OS X (Mac mini).

With best regards,
Victor.