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>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> 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 > Subscription: 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 > > > _______________________________________________ > 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/2016/05/29244.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 > Subscription: https://www.open-mpi.org/mailman/listinfo.cgi/usersLink to this post: http://www.open-mpi.org/community/lists/users/2016/05/29245.php
