Hah! I just saw your ticket about how --with-hwloc=/path/to/install is broken in 1.5.5. So -- let me go look in to that...
On Mar 2, 2012, at 8:58 AM, Jeffrey Squyres wrote: > 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/ > > > _______________________________________________ > 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/
