Open MPI logo

Hardware Locality Users' Mailing List Archives

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

Subject: Re: [hwloc-users] Magny Cours L3 cache issue
From: Samuel Thibault (samuel.thibault_at_[hidden])
Date: 2011-08-16 11:01:29


Wheeler, Kyle Bruce, le Tue 16 Aug 2011 16:52:54 +0200, a écrit :
> On Aug 15, 2011, at 4:14 PM, Samuel Thibault wrote:
> > Wheeler, Kyle Bruce, le Tue 16 Aug 2011 00:11:41 +0200, a écrit :
> >> I'm having the problem that my Magny Cours system is being identified (via hwloc-ls) as sharing an L3 cache between the NUMAnodes on a single socket. I know that this is not actually true, and I don't know how to begin debugging hwloc to see why it thinks that about the L3 cache. Thoughts?
> >
> > I guess you have updated to the latest Linux kernel version?
>
> Unfortunately, this is not on a machine I have root access to. But, for what it's worth, here's the uname -a output:
> Linux mzlogin01e 2.6.27.45-0.1-default #1 SMP 2010-02-22 16:49:47 +0100 x86_64 x86_64 x86_64 GNU/Linux

This is quite old indeed, I'm not surprised that there are topology
detection issues on it. And our x86 backend will probably not help since
it's not NUMA-aware.

Samuel