On Thu, Nov 8, 2012 at 11:07 AM, Jeff Squyres <jsquy...@cisco.com> wrote: > Correct. PLPA was a first attempt at a generic processor affinity solution. > hwloc is a 2nd generation, much Much MUCH better solution than PLPA (we > wholly killed PLPA > after the INRIA guys designed hwloc).
Edwin, We ported OGS/Grid Engine to hwloc 1.5 years ago (the original core binding code in Grid Engine uses PLPA). http://gridscheduler.sourceforge.net/projects/hwloc/GridEnginehwloc.html >From an API consumer (both PLPA & hwloc) point of view, some of the important hwloc advantages are: 1) Grid Engine now can use the same piece of code for different platforms: Linux, Solaris, AIX, Mac OS X, FreeBSD, Tru64, HP-UX, Windows. Before with PLPA, we only have support for Linux & Solaris. 2) Support for newer CPU architectures & hardware. As the development of PLPA stopped a few years ago, many of the newer architectures did not get recognized properly. We switched over to hwloc when the original Grid Engine core binding code stopped working on the AMD Magny-Cours (Opteron 6100 series). To be fair to PLPA, had the development continued, then it should have no issues with those new architectures. But then, the data structures of hwloc seem to be able to handle newer hardware components more nicely! We now use information from hwloc to optimize job placement on AMD Bulldozers (including Piledriver). Currently hwloc just treats each of the Bulldozer module as 2 cores, so we still have to code a bit of logic in the Grid Engine code to do what we need. http://blogs.scalablelogic.com/2012/07/optimizing-grid-engine-for-amd.html Rayson ================================================== Open Grid Scheduler - The Official Open Source Grid Engine http://gridscheduler.sourceforge.net/ > >> Re: layering, I believe you are saying that the relationship to libnuma is >> not one where hwloc is adding higher-level functionalities to libnuma, but >> rather hwloc is a much improved alternative except for a few system calls it >> makes via libnuma out of necessity or convenience. > > Correct. > > -- > Jeff Squyres > jsquy...@cisco.com > For corporate legal information go to: > http://www.cisco.com/web/about/doing_business/legal/cri/ > > > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users > > http://gridscheduler.sourceforge.net/GridEngine/GridEngineCloud.html
