Re: any performance profiling tools ??

On 30 Sep 1997 16:29:13 -0400, Glenn Everhart <everhart@gce.com>
wrote:


>David Coote wrote:
>> [ re profiling tools ]


>My understanding of ATOM is that it works at the executable or object
>layer...not sure which offhand...so should work for basically anything
>that the loader understands. What ATOM does is global optimization and
>I believe some customization for particular alpha chip. I've heard of
>20% gains in execution speed through the thing, though YMMV as usual...


As I understand it ATOM is a general purpose code munger - it
lets you manipulate the final executable, allowing global
optimisation, profiling, instrumentation, most things. The global
optimisation phase of the Digital compiler is just one of the things
it's used for.


>[Do any of these address the original question about profiling at a low
>enough level to count cache misses and the like? -John]


Not directly, but it's possible to use atom to instrument an
executable, integrating it with a traditional simulator. This lets
you write cycle accurate architectural simulators that burn
through a lot of simulated cycles per second.


Nothing at all to do with SPARC though, which I think is where
this started. Anyone from Sun out there?


Cheers,
    Steve
--
-- Steve Atkins -- steve@blighty.com
--

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