From: Wolfgang Lux <wlux@uni-muenster.de>
To: Richard Jones <rich@annexia.org>
Cc: Ocaml Mailing List <caml-list@inria.fr>
Subject: Re: [Caml-list] Profiling a function execution
Date: Sat, 15 Nov 2003 12:11:17 +0100 [thread overview]
Message-ID: <6F530E3A-175C-11D8-A49C-0003937628DA@uni-muenster.de> (raw)
In-Reply-To: <20031114123358.GA24353@redhat.com>
Richard Jones wrote:
> If you're using a Pentium-class machine, then a nice trick is to wrap
> the RDTSC assembly instruction and call that. It returns number of
> clock cycles elapsed (a 64 bit number IIRC). Here's some code to get
> you started:
This looks like complete nonsense to me. This will neither distinguish
user and system mode execution times. Even worse, clock cycles will
not have any meaning if the operating system chooses to perform a
task switch while the profiled function is executed. It is for such
reasons that Unix systems have an getrusage call.
Regards
Wolfgang
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next prev parent reply other threads:[~2003-11-15 11:11 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-11-13 22:34 Daniel Bünzli
2003-11-13 23:53 ` Brian Hurt
2003-11-14 12:23 ` Ville-Pertti Keinonen
2003-11-14 12:33 ` Richard Jones
2003-11-15 11:11 ` Wolfgang Lux [this message]
2003-11-15 12:21 ` David MENTRE
2003-11-15 12:54 ` Richard Jones
2003-11-25 18:05 ` Xavier Leroy
2003-11-25 21:54 ` Daniel Bünzli
2003-11-25 22:38 ` Kim Nguyen
2003-11-26 12:23 ` Ville-Pertti Keinonen
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