Hi Paul,
So Barcelona doesn't support dispatched op mode. From which version of
processors, it supports this mode?
Thanks,
Xu
----- Original Message -----
From: "Drongowski, Paul" <paul.drongow...@amd.com>
To: "Ramachandra CN" <cn.ramachan...@gmail.com>;
<perfmon2-devel@lists.sourceforge.net>
Sent: Wednesday, March 17, 2010 4:11 PM
Subject: Re: [perfmon2] IBS on Opteron
> Hello Ram --
>
> Instruction-Based Sampling (BS) is supported on AMD Family 10h
> processors (both Phenom(tm) and Opteron(tm)).
>
> An AMD Opteron 180 is a so-called "K8" processor and
> pre-dates AMD Family 10h. So, The AMD Opteron 180's do
> not support IBS, I'm sorry to say.
>
> The AMD Opteron 2354 is a Family 10h processor and does
> support IBS. The 2354 is a stepping B3 processor ("Barcelona").
> It supports IBS cycles mode for op selection/tagging. It does _not_
> support IBS dispatched op mode for op selection/tagging.
> IBS cycles mode is subject to dispatch stalls, so the
> resulting distribution of IBS op samples is biased.
> IBS dispatched op mode is the preferred mode. Unfortunately,
> this mode is not supported on a stepping B3 processor.
>
> Hope this information helps!
>
> -- pj
>
> Paul Drongowski
> AMD CodeAnalyst team
> AMD Boston Design Center
>
>
> -----Original Message-----
> From: Ramachandra CN [mailto:cn.ramachan...@gmail.com]
> Sent: Wednesday, March 17, 2010 4:27 PM
> To: perfmon2-devel@lists.sourceforge.net
> Subject: [perfmon2] IBS on Opteron
>
> Hi,
>
> I was planning to use IBS (Instruction-based sampling) on an Opteron
> cluster that we have in our University. And had some questions about
> setting it up.
>
> The cluster has a collection of dual core and quad core Opteron
> processors. Model types are:
> Dual Core AMD Opteron(tm) Processor 180
> Quad-Core AMD Opteron(tm) Processor 2354
>
> The current kernel version is 2.6.25.11. The machine has the perfctr
> and PAPI library installed over it. So I as understand I still need to
> install the perfmon kernel patch.
>
> I wanted to know if the above processors have support for IBS, and
> what patch I have to install for the kernel to support it.
>
> Thank you
> Regards,
> Ram
> Graduate Student
> University of Houston
>
> ------------------------------------------------------------------------
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------------------------------------------------------------------------------
Download Intel® Parallel Studio Eval
Try the new software tools for yourself. Speed compiling, find bugs
proactively, and fine-tune applications for parallel performance.
See why Intel Parallel Studio got high marks during beta.
http://p.sf.net/sfu/intel-sw-dev
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