Mailinglist Archive: opensuse-programming (8 mails)

[Per Jessen <per@xxxxxxxxxxxx>]

Marcus Meissner wrote:

> On Sun, Mar 20, 2011 at 09:34:24AM -0400, Jerry Feldman wrote:
> > On 03/19/2011 02:21 PM, Per Jessen wrote:
> > > I'm trying to optimize some assembler code for which I'm measuring
> > > runtime over a <slice of data>.  Is there any easy (in C or
> > > assembler )
> > > access to counters for pipeline stalls and cache misses available? 
> > > At some point I'd also like to look at context switches, although
> > > I'm not sure how I might affect those.
> > Valgrind can give you some of what you want. I've also used Intel's
> > Vtune. The Linux Trace Toolkit may also be useful. But, I think for
> > things like pipeline stalls you would need one of the profiling
> > tools.
>
> oprofile is also at this kind of lowlevel.

Thanks, I'll have to take a closer look.  I had sort of hoped to be able
to something like this:

a=readcounter()
<run my code>
b=readcounter()

b-a = number of events (stalls, context switch, cache miss etc).


/Per Jessen, Zürich

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