Re: ia64 dispersal analysis capability

From: Jack Steiner <>
Date: 2005-09-23 02:58:42
On Wed, Sep 21, 2005 at 10:45:37PM -0700, David Mosberger-Tang wrote:
> On 9/21/05, Jack Steiner <> wrote:
> > In 2002, Gary Hade posted a patch to binutils that added dispersal
> > analysis to the output of objdump. Does anyone know what happened to
> > the patch? Is there another tool that provides the same information?
> Yeah, a tool called Montecito! ;-)

Is montecito a free opensource tool   :-)

> I don't remember whether you were at the last Gelato meeting and
> whether you attended the PMU talk.  If you didn't: I had some slides
> in there that showed how the IP-EAR can be used to get
> instruction-group issue traces which show you exactly how many
> stall-cycles there are between subsequent instruction-groups.  Yes,
> that's a bit different from the static info you are looking for, but
> in many ways it's much better info, so it's real (measured) data and
> takes into affect all corner cases, including memory latency etc.

Yes, I was at the meeting but I had forgotten about the IP-EAR  :-(

It looks like the IP-EAR will be useful in a lot of cases. However, a 
static analysis tool would also be useful. It would be nice to have both.

BTW, does the current version of pfmon support montecito? Are any 
perfmon.c kernel patches needed??

>   --david
> --
> Mosberger Consulting LLC, voice/fax: 510-744-9372,
> 35706 Runckel Lane, Fremont, CA 94536


Jack Steiner (          651-683-5302
Principal Engineer                      SGI - Silicon Graphics, Inc.

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Received on Fri Sep 23 02:59:22 2005

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