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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