Open MPI logo

Open MPI Development Mailing List Archives

  |   Home   |   Support   |   FAQ   |   all Development mailing list

Subject: Re: [OMPI devel] Very poor performance with btl sm on twin nehalem servers with Mellanox ConnectX installed
From: Christopher Samuel (samuel_at_[hidden])
Date: 2010-05-17 20:33:22

On 18/05/10 07:02, Jeff Squyres wrote:

> What's the advantage of /dev/shm? (I don't know anything
> about /dev/shm)

Looking at our CentOS 5.4 install /dev/shm is a tmpfs
filesystem (defaults to use up to 1/2 RAM of the system)
and hence should give lightning fast file I/O.

More info here:


  Christopher Samuel - Senior Systems Administrator
  VLSCI - Victorian Life Sciences Computational Initiative
  Email: samuel_at_[hidden] Phone: +61 (0)3 903 55545