Open MPI logo

Hardware Locality Development Mailing List Archives

  |   Home   |   Support   |   FAQ   |   all Hardware Locality Development mailing list

Subject: Re: [hwloc-devel] SWIG bindings
From: Samuel Thibault (samuel.thibault_at_[hidden])
Date: 2010-12-02 15:00:21

Jeff Squyres, le Thu 02 Dec 2010 20:42:40 +0100, a écrit :
> > These were my ideas. Comments are welcome. Note that we have very big
> > machines with complicated topologies. Executing lstopo (pure C API)
> > takes up to a second there. It made no sense to me to slow this down
> > more.
> Also agreed.
> Do you have any feel for if there are particular bottlenecks in hwloc / lstopo that make it take so long? I wonder if we should just attack those (if possible)...? Samuel and Brice have done all the work in the guts of the API, so they might know offhand if there are places that can be optimized or not...

Actually, considering the huge pile of /proc and /sys files that parsing
1024 processors requires, one second doesn't seem so much to me :) But
yes, an somethingprof output could be useful to determine whether there
is room for improvement.