On Apr 10, 2014, at 7:58 AM, Victor Vysotskiy <victor.vysots...@teokem.lu.se> wrote:
> 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. Hmmm...odd, we aren't seeing that in our timing tests (running about even against MPICH, and against Cray when correct options are selected). Will have to explore that further. > 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 ... Doesn't make any sense - that option wouldn't have any impact whatsoever in the situation you describe with that code snippet. Something else must be going on... > >> 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). Okay, I'll try to do a little poking around. Meantime, please send along the output from "ompi_info" so we can see how this was configured and what built. > > With best regards, > Victor. > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users
