> So my basic question is "how to force tightly integrated openmpi to use > a (sligthly) different set of hostnames so that the IB fabric is > actually used ..."
OpenMPI should just pick the "best" interface topology, which in your case, should be the IB. The one time I have had issues with OpenMPI geting things wrong, was in running a VM cluster which had both the "real" IP interfaces, which I had configured and some "background VM-control" interfaces, which I had not, though once I'd realised what was happening, it was a simple case to defeat the "extra" network using command-line flags to the mpirun invocation. Having said that, if you also had a IPoIB network, it might be fun to see which gets the nod! -- Kevin M. Buckley Room: CO327 School of Engineering and Phone: +64 4 463 5971 Computer Science Victoria University of Wellington New Zealand _______________________________________________ users mailing list [email protected] https://gridengine.org/mailman/listinfo/users
