Hi Ulf, Just my 2$c: When requesting the node exclusive then overcommitting the node scatters the tasks over the cores of the node. That is, not all tasks are placed on a single core. Moreover, you can specify the cores you would like to use by "--cpu_bind".
Cheers, Oliver -- Dr. Oliver Fortmeier Technical Analyst High-Performance Computing Phone: +49 (0) 2203 / 305 2465 Mobile: +49 (0) 173 / 5887589 E-mail: [email protected] > -----Ursprüngliche Nachricht----- > Von: Ulf Markwardt [mailto:[email protected]] > Gesendet: Mittwoch, 29. Januar 2014 18:24 > An: slurm-dev > Betreff: [slurm-dev] Re: Overcommit sets wrong affinity mask > > Hello Moe, > > > That is exactly what the overcommit option is designed to do. > > >> when I do > >> salloc -p sandy --overcommit --ntasks-per-node=16 --ntasks-per-core=2 > -t 10 > >> all tasks run on a single core: > > Hm, thats a bit confusing for me. It looks like "--overcommit" and > "--ntasks-per-core=2" do not work together. > > Is there a way to tell SLURM that I want to run exactly two processes > per core? > > Thanks > Ulf > > > -- > ___________________________________________________________________ > Dr. Ulf Markwardt > > Technische Universität Dresden > Center for Information Services and High Performance Computing (ZIH) > 01062 Dresden, Germany > > Phone: (+49) 351/463-33640 WWW: http://www.tu-dresden.de/zih Bull GmbH Sitz Köln, Amtsgericht Köln, HR B 8173 Ust-Id-Nr.: DE 121965133, WEEE-Reg.-Nr. DE 64193985 Geschäftsführer: Gerd-Lothar Leonhart, Michael Heinrichs, Philippe Miltin Zentrale: 51149 Köln, Von-der-Wettern-Strasse 27 Telefon: +49 (0) 2203 305-0 Telefax: +49 (0) 2203 305-1699 http://www.bull.de Bull, Architect of an Open World TM ** Folgen Sie uns auf Twitter: http://twitter.com/bull_de ** Bull Firmenprofil bei XING: https://www.xing.com/companies/bullgmbh
