[Beowulf] itanium vs. x86-64

Tom Elken tom.elken at qlogic.com
Tue Feb 10 13:17:44 PST 2009

> Which profilers can 
> benefit from all this info?

We have found Oprofile to be a useful text-oriented tool:
>From the Overview on this page:
"OProfile is a system-wide profiler for Linux systems, capable of profiling all running code at low overhead. OProfile is released under the GNU GPL.

It consists of a kernel driver and a daemon for collecting sample data, and several post-profiling tools for turning data into information.

OProfile leverages the hardware performance counters of the CPU to enable profiling of a wide variety of interesting statistics, which can also be used for basic time-spent profiling. All code is profiled: hardware and software interrupt handlers, kernel modules, the kernel, shared libraries, and applications."


> This monster suite (free!):
> http://www.cs.uoregon.edu/research/tau/docs.php
> Which I have been pushing around for a while and it's quite impressive
> IMHO. Weird thing is I seem to be the only one interested in 
> profiling and
> metrics and all that gunk around here. Guess that will change 
> now that it
> is actually possible to _measure_ the FLOPS your application _truely_
> consumes thanks to these counters (I mean, for us laymans 
> that never had
> access to such cool hardware :P )
> >
> > toon
> >
> Eric
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