PDA

View Full Version : Squyres: Are MPI-3 Non-Blocking Barriers a Crazy Idea?


News
09-16-12, 03:50 PM
http://blogs.cisco.com/wp-content/uploads/userphoto/JeffSquyres.jpgCisco‚??s Jeff Squyres writes that the MPI-3 (http://meetings.mpi-forum.org/MPI_3.0_main_page.php) non-blocking ‚??barrier‚?? collective (MPI_Ibarrier) may seem counter-intuitive, but it is actually very useful. I mean, why would you block while waiting?

Here‚??s an analogy: a barrier is very much like the start of a meeting. You can‚??t start the meeting until all the participants of the meeting arrive. And there‚??s always That Guy who‚??s 15 minutes late (yeah, we all know That Guy). Think of non-blocking barriers as a notification mechanism that everyone has reached (or passed) a common milestone.

Read the Full Story (http://blogs.cisco.com/performance/mpi_ibarrier-crazy).

http://insidehpc.com/?ak_action=api_record_view&id=31620&type=feedRelated posts:

Squyres on Process Affinity in Open MPI v1.7 (http://insidehpc.com/2012/09/13/squyres-on-process-affinity-in-open-mpi-v1-7/)
Squyres on MPI Connection Management (http://insidehpc.com/2011/09/04/squyres-on-mpi-connection-management/)
Exascale by 2018: Crazy ‚?¶or Possible? (http://insidehpc.com/2012/02/21/exascale-by-2018-crazy-or-possible/)


http://feeds.feedburner.com/~ff/InsideHPC?d=yIl2AUoC8zA (http://feeds.feedburner.com/~ff/InsideHPC?a=QfWZT1j4ErI:jFrUjjUmlK4:yIl2AUoC8zA) http://feeds.feedburner.com/~ff/InsideHPC?i=QfWZT1j4ErI:jFrUjjUmlK4:F7zBnMyn0Lo (http://feeds.feedburner.com/~ff/InsideHPC?a=QfWZT1j4ErI:jFrUjjUmlK4:F7zBnMyn0Lo) http://feeds.feedburner.com/~ff/InsideHPC?i=QfWZT1j4ErI:jFrUjjUmlK4:V_sGLiPBpWU (http://feeds.feedburner.com/~ff/InsideHPC?a=QfWZT1j4ErI:jFrUjjUmlK4:V_sGLiPBpWU)
http://feeds.feedburner.com/~r/InsideHPC/~4/QfWZT1j4ErI

More... (http://feedproxy.google.com/~r/InsideHPC/~3/QfWZT1j4ErI/)