Ok. Good that there's no oversubscription bug, at least. :-) Did you see my off-list mail to you yesterday about building with an external copy of hwloc 1.4 to see if that helps?
On Mar 2, 2012, at 8:26 AM, Matthias Jurenz wrote: > To exclude a possible bug within the LSF component, I rebuilt Open MPI > without > support for LSF (--without-lsf). > > -> It makes no difference - the latency is still bad: ~1.1us. > > Matthias > > On Friday 02 March 2012 13:50:13 Matthias Jurenz wrote: >> SORRY, it was obviously a big mistake by me. :-( >> >> Open MPI 1.5.5 was built with LSF support, so when starting an LSF job it's >> necessary to request at least the number of tasks/cores as used for the >> subsequent mpirun command. That was not the case - I forgot the bsub's '-n' >> option to specify the number of task, so only *one* task/core was >> requested. >> >> Open MPI 1.4.5 was built *without* LSF support, so the supposed misbehavior >> could not happen with it. >> >> In short, there is no bug in Open MPI 1.5.x regarding to the detection of >> oversubscription. Sorry for any confusion! >> >> Matthias >> >> On Tuesday 28 February 2012 13:36:56 Matthias Jurenz wrote: >>> When using Open MPI v1.4.5 I get ~1.1us. That's the same result as I get >>> with Open MPI v1.5.x using mpi_yield_when_idle=0. >>> So I think there is a bug in Open MPI (v1.5.4 and v1.5.5rc2) regarding to >>> the automatic performance mode selection. >>> >>> When enabling the degraded performance mode for Open MPI 1.4.5 >>> (mpi_yield_when_idle=1) I get ~1.8us latencies. >>> >>> Matthias >>> >>> On Tuesday 28 February 2012 06:20:28 Christopher Samuel wrote: >>>> On 13/02/12 22:11, Matthias Jurenz wrote: >>>>> Do you have any idea? Please help! >>>> >>>> Do you see the same bad latency in the old branch (1.4.5) ? >>>> >>>> cheers, >>>> Chris >>> >>> _______________________________________________ >>> devel mailing list >>> de...@open-mpi.org >>> http://www.open-mpi.org/mailman/listinfo.cgi/devel >> >> _______________________________________________ >> devel mailing list >> de...@open-mpi.org >> http://www.open-mpi.org/mailman/listinfo.cgi/devel > _______________________________________________ > devel mailing list > de...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/devel -- Jeff Squyres jsquy...@cisco.com For corporate legal information go to: http://www.cisco.com/web/about/doing_business/legal/cri/
