This is 1.7.3 - there is no comm thread in ORTE in that version. On Sep 4, 2013, at 1:33 AM, George Bosilca <bosi...@icl.utk.edu> wrote:
> You can confirm that the slowdown happen during the MPI initialization stages > by profiling the application (especially the MPI_Init call). > > Another possible cause of slowdown might be the communication thread in the > ORTE. If it remains active outside the initialization it will definitively > disturb the application, by taking away critical resources. > > George. > > On Sep 4, 2013, at 05:59 , Christopher Samuel <sam...@unimelb.edu.au> wrote: > >> -----BEGIN PGP SIGNED MESSAGE----- >> Hash: SHA1 >> >> On 04/09/13 11:29, Ralph Castain wrote: >> >>> Your code is obviously doing something much more than just >>> launching and wiring up, so it is difficult to assess the >>> difference in speed between 1.6.5 and 1.7.3 - my guess is that it >>> has to do with changes in the MPI transport layer and nothing to do >>> with PMI or not. >> >> I'm testing with what would be our most used application in aggregate >> across our systems, the NAMD molecular dynamics code from here: >> >> http://www.ks.uiuc.edu/Research/namd/ >> >> so yes, you're quite right, it's doing a lot more than that and has a >> reputation for being a *very* chatty MPI code. >> >> For comparison whilst users see GROMACS also suffer with srun under >> 1.6.5 they don't see anything like the slow down that NAMD gets. >> >> All the best, >> Chris >> - -- >> Christopher Samuel Senior Systems Administrator >> VLSCI - Victorian Life Sciences Computation Initiative >> Email: sam...@unimelb.edu.au Phone: +61 (0)3 903 55545 >> http://www.vlsci.org.au/ http://twitter.com/vlsci >> >> -----BEGIN PGP SIGNATURE----- >> Version: GnuPG v1.4.11 (GNU/Linux) >> Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ >> >> iEYEARECAAYFAlImsCwACgkQO2KABBYQAh8c4wCfQlOd6ZL68tncAd1h3Fyb1hAr >> DicAn06seL8GzYPGtGImnYkb7sYd5op9 >> =pkwZ >> -----END PGP SIGNATURE----- >> _______________________________________________ >> 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
