we did not get to the bottom for "why". Tried different mpi packages (mvapich,intel mpi) and the observation hold true.
it could be many factors affected by huge heap size (cpu cache misses? swapness?). On Wed, Sep 30, 2015 at 1:12 PM, Dave Love <d.l...@liverpool.ac.uk> wrote: > Mike Dubman <mi...@dev.mellanox.co.il> writes: > > > Hello Grigory, > > > > We observed ~10% performance degradation with heap size set to unlimited > > for CFD applications. > > OK, but why? It would help to understand what the mechanism is, and why > MXM specifically tells you to set the stack to the default, which may > well be wrong for the application. > _______________________________________________ > users mailing list > us...@open-mpi.org > Subscription: http://www.open-mpi.org/mailman/listinfo.cgi/users > Link to this post: > http://www.open-mpi.org/community/lists/users/2015/09/27723.php > -- Kind Regards, M.
