No!! A “slot” is purely a bookkeeping construct that schedulers use to tell you how many procs you can run. It has nothing to do with a core or any other physical resource.
It is true that we generally configure our schedulers to set the max #slots on each node to equal the #cores on the node - but that is purely a configuration choice. > On May 19, 2016, at 4:29 PM, Saliya Ekanayake <esal...@gmail.com> wrote: > > Thank you, Tetsuya. So is a slot = core? > > On Thu, May 19, 2016 at 7:26 PM, <tmish...@jcity.maeda.co.jp > <mailto:tmish...@jcity.maeda.co.jp>> wrote: > Hi Saliya and Ralph, > > I guess Ralph is confusing "bind-to core" with "bind-to slot". > > As far as I remember, when you add "PE=N" option to the map-by directive, > you can only use "bind to slot". > > So if you want to bind a process to specific slots(almost same as cores), > you should use "bind-to slot". > > Regards, > Tetsuya > > 2016/05/20 5:03:27、"users"さんは「Re: [OMPI users] The effect of --bind-to > in the presence of PE=N in --map-by」で書きました > > So if bind-to-core is in effect, does that mean it'll run only on 1 core > even though I'd like it to be able to utilize 4 cores. For examples, I'll > be creating 4 threads within the process and would > > like to pin them to each core the process has been bound to. > > > > On Thu, May 19, 2016 at 3:46 PM, Ralph Castain <r...@open-mpi.org > > <mailto:r...@open-mpi.org>>wrote: > > Perhaps we should error out, but at the moment, PE=4 forces bind-to-core > and so the bind-to socket is being ignored > > > > On May 19, 2016, at 12:06 PM, Saliya Ekanayake <esal...@gmail.com > > <mailto:esal...@gmail.com>> wrote: > > > > Hi, > > > > I understand --map-by will determine the process placement whereas > --bind-to will keep the processes pinned to the given resource. If this > understanding is correct, then I've got a doubt with the > > following. > > > > On a node with 2 sockets and 12 cores each, > > > > --map-by ppr:3:socket,PE=4 --bind-to socket > > > > My understanding is that this will give each process 4 cores. Now, with > bind to socket, does that mean it's possible that within a socket the > assgined 4 cores for a process may change? Or will they > > stay in the same 4 cores always? > > > > Thank you, > > Saliya > > > > -- > > Saliya Ekanayake > > Ph.D. Candidate | Research Assistant > > School of Informatics and Computing | Digital Science Center > > Indiana University, Bloomington > > > > > > _______________________________________________ > > users mailing list > > us...@open-mpi.org <mailto:us...@open-mpi.org> > > Subscription: https://www.open-mpi.org/mailman/listinfo.cgi/users > > <https://www.open-mpi.org/mailman/listinfo.cgi/users> > > Link to this post: > http://www.open-mpi.org/community/lists/users/2016/05/29243.php > <http://www.open-mpi.org/community/lists/users/2016/05/29243.php> > > > > > > _______________________________________________ > > users mailing list > > us...@open-mpi.org <mailto:us...@open-mpi.org> > > Subscription: https://www.open-mpi.org/mailman/listinfo.cgi/users > > <https://www.open-mpi.org/mailman/listinfo.cgi/users> > > Link to this post: > http://www.open-mpi.org/community/lists/users/2016/05/29244.php > <http://www.open-mpi.org/community/lists/users/2016/05/29244.php> > > > > > > > > -- > > Saliya Ekanayake > > Ph.D. Candidate | Research Assistant > > School of Informatics and Computing | Digital Science Center > > Indiana University, Bloomington > > > > _______________________________________________ > > users mailing list > > us...@open-mpi.org <mailto:us...@open-mpi.org> > > Subscription: https://www.open-mpi.org/mailman/listinfo.cgi/usersLink > > <https://www.open-mpi.org/mailman/listinfo.cgi/usersLink> to > this post: http://www.open-mpi.org/community/lists/users/2016/05/29245.php > <http://www.open-mpi.org/community/lists/users/2016/05/29245.php> > _______________________________________________ > users mailing list > us...@open-mpi.org <mailto:us...@open-mpi.org> > Subscription: https://www.open-mpi.org/mailman/listinfo.cgi/users > <https://www.open-mpi.org/mailman/listinfo.cgi/users> > Link to this post: > http://www.open-mpi.org/community/lists/users/2016/05/29248.php > <http://www.open-mpi.org/community/lists/users/2016/05/29248.php> > > > -- > Saliya Ekanayake > Ph.D. Candidate | Research Assistant > School of Informatics and Computing | Digital Science Center > Indiana University, Bloomington > > _______________________________________________ > users mailing list > us...@open-mpi.org > Subscription: https://www.open-mpi.org/mailman/listinfo.cgi/users > Link to this post: > http://www.open-mpi.org/community/lists/users/2016/05/29249.php
