Re: [OMPI devel] RFC: set MCA param mpi_add_procs_cutoff default to 32

2016-02-04 Thread Ralph Castain
Yes and no re the dependency. Without async_modex, the cutoff will save you memory footprint but not result in any launch performance benefit. Likewise, turning on async_modex without being over the cutoff won't do you any good as you'll immediately demand all the modex data. So they are kinda rel

Re: [OMPI devel] RFC: set MCA param mpi_add_procs_cutoff default to 32

2016-02-04 Thread Jeff Squyres (jsquyres)
On Feb 4, 2016, at 9:18 AM, Ralph Castain wrote: > > +1, with an addition and modification: > > * add the async_modex on by default > * make the change in master and let it "stew" for awhile before moving to > 2.0. I believe only Cisco has been running MTT against that setup so far. It's been

Re: [OMPI devel] RFC: set MCA param mpi_add_procs_cutoff default to 32

2016-02-04 Thread Ralph Castain
+1, with an addition and modification: * add the async_modex on by default * make the change in master and let it "stew" for awhile before moving to 2.0. I believe only Cisco has been running MTT against that setup so far. On Thu, Feb 4, 2016 at 6:04 AM, Gilles Gouaillardet < gilles.gouaillar...

Re: [OMPI devel] RFC: set MCA param mpi_add_procs_cutoff default to 32

2016-02-04 Thread Gilles Gouaillardet
+1 should we also enable sparse groups by default ? (or at least on master, and then v2.x later) Cheers, Gilles On Thursday, February 4, 2016, Joshua Ladd wrote: > +1 > > > On Wed, Feb 3, 2016 at 9:54 PM, Jeff Squyres (jsquyres) < > jsquy...@cisco.com > > wrote: > >> WHAT: Decrease default va

Re: [OMPI devel] RFC: set MCA param mpi_add_procs_cutoff default to 32

2016-02-04 Thread Joshua Ladd
+1 On Wed, Feb 3, 2016 at 9:54 PM, Jeff Squyres (jsquyres) wrote: > WHAT: Decrease default value of mpi_add_procs_cutoff from 1024 to 32 > > WHY: The "partial add procs" behavior is supposed to be a key feature of > v2.0.0 > > WHERE: ompi/mpi/runtime/ompi_mpi_params.c > > TIMEOUT: Next Tuesday

[OMPI devel] RFC: set MCA param mpi_add_procs_cutoff default to 32

2016-02-03 Thread Jeff Squyres (jsquyres)
WHAT: Decrease default value of mpi_add_procs_cutoff from 1024 to 32 WHY: The "partial add procs" behavior is supposed to be a key feature of v2.0.0 WHERE: ompi/mpi/runtime/ompi_mpi_params.c TIMEOUT: Next Tuesday teleconf (9 Feb 2016) MORE DETAIL: The mpi_add_procs_cutoff MCA param controls th