Hi, Rafael, Could you provide the output when you run with `QT_INFO=1` set in the environment? Assuming you¹re using hwloc, could you also provide the output of `lstopo -v`?
Dylan On 5/31/15, 10:53 AM, "Rafael Larrosa Jiménez" <[email protected]> wrote: >Hi, > >I have found a problem while using qthreads with gastnet, to make it >simpler I >will consider only one locale, but when more are used the problem is >exactly >the same. > >The platform is a cluster of locales (each with 16 cores and 64 GBytes of >RAM). More precisely, each locale has two sockets with 8 cores each and >Hyper-Threading has been disabled. > >The Chapel program has just these two lines: >---- >use Time; >sleep(50); >---- > >When compiled with gasnet, two threads use 100% of CPU while the sleep is >executed, with one of them using about 34.9%user, 62.5%sys, and the other >100% >user. I ended up checking this simple chapel code because for another >(more >realistic) application, I obtained some scalability when moving from 1 to >8 >threads per locale, but execution time increase if I use more than 8 >threads >although, as I said, the locale has 16 cores. > >Any thoughts? > >Thank you very much in advance, > >Rafael >-- >Rafael Larrosa Jiménez >Centro de Supercomputación y Bioinformática - http://www.scbi.uma.es >Universidad de Málaga > >EMAIL: [email protected] Edificio de Bioinnovación >TELEF: + 34951952788 C/ Severo Ochoa 34 >FAX : +34951952792 Parque Tecnológico de Andalucía > 29590 Málaga (SPAIN) > > >-------------------------------------------------------------------------- >---- >_______________________________________________ >Chapel-developers mailing list >[email protected] >https://lists.sourceforge.net/lists/listinfo/chapel-developers ------------------------------------------------------------------------------ _______________________________________________ Chapel-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/chapel-developers
