Hi Ralph, Yes the report bindings show the correct binding as expected for the processes. The doubt I am having is, say I spawn a thread within my process. If I don't specify affinity for it, is it possible for it to get scheduled to run in a core outside that of the process?
Second question is, does MPI provides an API such that I can retrieve the binding info from program to take decisions on setting thread affinity? Thank you, Saliya On Mon, Dec 22, 2014 at 1:18 PM, Ralph Castain <r...@open-mpi.org> wrote: > FWIW: it looks like we are indeed binding to core if PE is set, so if you > are seeing something different, then we may have a bug somewhere. > > If you add —report-bindings to your cmd line, you should see where we > bound the procs - does that look correct? > > > On Dec 22, 2014, at 9:49 AM, Ralph Castain <r...@open-mpi.org> wrote: > > They will be bound to whatever level you specified - I believe by default > we bind to socket when mapping by socket. If you want them bound to core, > you might need to add —bind-to core. > > I can take a look at it - I *thought* we had reset that to bind-to core > when PE=N was specified, but maybe that got lost. > > > On Dec 22, 2014, at 8:32 AM, Saliya Ekanayake <esal...@gmail.com> wrote: > > Hi, > > I've been using --map-by socket:PE=N, where N is used to control the > number of cores a proc gets mapped to. Does this also guarantee that a proc > is bound to N cores in the socket? I am asking this because I see some > threads spawned by the process run outside the given N cores in the socket. > > Is this expected or I guess I am missing some binding parameter here? > Also, is there some documentation on these different choices? Are the > options in [1] available in current release? > > [1] > http://www.slideshare.net/jsquyres/open-mpi-explorations-in-process-affinity-eurompi13-presentation > > Thank you, > Saliya > > -- > Saliya Ekanayake > Ph.D. Candidate | Research Assistant > School of Informatics and Computing | Digital Science Center > Indiana University, Bloomington > Cell 812-391-4914 > http://saliya.org > _______________________________________________ > users mailing list > us...@open-mpi.org > Subscription: http://www.open-mpi.org/mailman/listinfo.cgi/users > Link to this post: > http://www.open-mpi.org/community/lists/users/2014/12/26051.php > > > > > _______________________________________________ > users mailing list > us...@open-mpi.org > Subscription: http://www.open-mpi.org/mailman/listinfo.cgi/users > Link to this post: > http://www.open-mpi.org/community/lists/users/2014/12/26054.php > -- Saliya Ekanayake Ph.D. Candidate | Research Assistant School of Informatics and Computing | Digital Science Center Indiana University, Bloomington Cell 812-391-4914 http://saliya.org
