Ronald, did you try to build openmpi with a previous gcc release ? if yes, what about the performance ?
did you build openmpi from a tarball or from git ? if from git and without VPATH, then you need to configure with --disable-debug iirc, one issue was identified previously (gcc optimization that prevents the memory wrapper from behaving as expected) and I am not sure the fix landed in v1.10 branch nor master ... thanks for the info about gcc 6.0.0 now this is supported on a free compiler (cray and intel already support that, but they are commercial compilers), I will resume my work on supporting this Cheers, Gilles On Wednesday, March 23, 2016, Ronald Cohen <recoh...@gmail.com> wrote: > I get 100 GFLOPS for 16 cores on one node, but 1 GFLOP running 8 cores > on two nodes. It seems that quad-infiniband should do better than > this. I built openmpi-1.10.2g with gcc version 6.0.0 20160317 . Any > ideas of what to do to get usable performance? Thank you! > > bstatus > Infiniband device 'mlx4_0' port 1 status: > default gid: fe80:0000:0000:0000:0002:c903:00ec:9301 > base lid: 0x1 > sm lid: 0x1 > state: 4: ACTIVE > phys state: 5: LinkUp > rate: 56 Gb/sec (4X FDR) > link_layer: InfiniBand > > Ron > -- > > Professor Dr. Ronald Cohen > Ludwig Maximilians Universität > Theresienstrasse 41 Room 207 > Department für Geo- und Umweltwissenschaften > München > 80333 > Deutschland > > > ronald.co...@min.uni-muenchen.de <javascript:;> > skype: ronaldcohen > +49 (0) 89 74567980 > --- > Ronald Cohen > Geophysical Laboratory > Carnegie Institution > 5251 Broad Branch Rd., N.W. > Washington, D.C. 20015 > rco...@carnegiescience.edu <javascript:;> > office: 202-478-8937 > skype: ronaldcohen > https://twitter.com/recohen3 > https://www.linkedin.com/profile/view?id=163327727 > > > --- > Ron Cohen > recoh...@gmail.com <javascript:;> > skypename: ronaldcohen > twitter: @recohen3 > _______________________________________________ > users mailing list > us...@open-mpi.org <javascript:;> > Subscription: http://www.open-mpi.org/mailman/listinfo.cgi/users > Link to this post: > http://www.open-mpi.org/community/lists/users/2016/03/28791.php
