Check out, in particular, the section "Single-task and multi-task modes".
On Dec 11, 2014, at 11:06 PM, Jeff Hammond <jeff.scie...@gmail.com> wrote: > Can someone post docs for this resource halving Squyres claims? I've never > heard of this. > > Jeff > > On Thursday, December 11, 2014, Samuel Thibault <samuel.thiba...@inria.fr> > wrote: > Jeff Squyres (jsquyres), le Thu 11 Dec 2014 21:12:27 +0000, a écrit : > > When the BIOS is set to enable hyper threading, then several resources on > > the core are split when the machine is booted up (e.g., some of the queue > > depths for various processing units in the core are half the length that > > they are when hyperthreading is disabled in the BIOS). > > Perhaps some queues get divided, but most of the resources (such as > cache, TLB, etc.) are completely available when using only one > hyperthread, like they would be with HT disabled. > > Samuel > _______________________________________________ > hwloc-users mailing list > hwloc-us...@open-mpi.org > Subscription: http://www.open-mpi.org/mailman/listinfo.cgi/hwloc-users > Link to this post: > http://www.open-mpi.org/community/lists/hwloc-users/2014/12/1132.php > > > -- > Jeff Hammond > jeff.scie...@gmail.com > http://jeffhammond.github.io/ > _______________________________________________ > hwloc-users mailing list > hwloc-us...@open-mpi.org > Subscription: http://www.open-mpi.org/mailman/listinfo.cgi/hwloc-users > Link to this post: > http://www.open-mpi.org/community/lists/hwloc-users/2014/12/1134.php -- Jeff Squyres jsquy...@cisco.com For corporate legal information go to: http://www.cisco.com/web/about/doing_business/legal/cri/
Hyperthreading.pdf
Description: Hyperthreading.pdf
