Thank you! Here are the answers: I did not try a previous release of gcc. I built from a tarball. What should I do about the iirc issue--how should I check? Are there any flags I should be using for infiniband? Is this a problem with latency?
Ron --- Ron Cohen recoh...@gmail.com skypename: ronaldcohen twitter: @recohen3 On Wed, Mar 23, 2016 at 8:13 AM, Gilles Gouaillardet <gilles.gouaillar...@gmail.com> wrote: > 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 >> 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 >> office: 202-478-8937 >> skype: ronaldcohen >> https://twitter.com/recohen3 >> https://www.linkedin.com/profile/view?id=163327727 >> >> >> --- >> Ron Cohen >> recoh...@gmail.com >> skypename: ronaldcohen >> twitter: @recohen3 >> _______________________________________________ >> 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/2016/03/28791.php > > > _______________________________________________ > 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/2016/03/28793.php
