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From: julien.desfossez@polymtl.ca (Julien Desfossez)
Subject: [ltt-dev] LTTng-UST vs SystemTap userspace tracing benchmarks
Date: Thu, 17 Feb 2011 12:33:35 -0500	[thread overview]
Message-ID: <4D5D5BEF.4040809@polymtl.ca> (raw)
In-Reply-To: <m37hd06lpj.fsf@fleche.redhat.com>

Hi,

On 02/16/2011 10:30 AM, Tom Tromey wrote:
> Julien> 0) Baseline : running the program without any instrumentation
> Julien> 1) Flight recorder tracing comparison UST vs SystemTap
> 
> I'd be interested to also see the numbers when the probes are in place
> in the source, but not enabled.  That is, what is the overhead of a
> disabled probe?
I disabled the probe by undefining HAVE_SYSTEMTAP, but I have the same
results in flight recorder mode. Of course if the module is not loaded
we have no overhead at all. It means that the module is responsible for
all the overhead regarless if the probe is called or not.
I would be really interested if you know why it happens (and how to fix it).
This last test was done on a Fedora Core 14 (kernel
2.6.35.10-74.fc14.x86_64 with SystemTap 1.3-3).

If you want to test, the benchmark code is here :
git://git.lttng.org/benchmarks.git

Thanks,

Julien




  parent reply	other threads:[~2011-02-17 17:33 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-02-15 15:53 Julien Desfossez
2011-02-15 16:25 ` William Cohen
2011-02-17 16:20   ` Julien Desfossez
2011-02-15 16:26 ` Frank Ch. Eigler
2011-02-15 16:54   ` Mathieu Desnoyers
2011-02-15 17:39     ` Frank Ch. Eigler
2011-02-15 22:25       ` Mathieu Desnoyers
2011-02-15 17:00   ` Stefan Hajnoczi
2011-02-15 17:04     ` Mathieu Desnoyers
2011-02-16 10:56     ` Mark Wielaard
2011-02-16 18:50       ` Roland McGrath
2011-02-16 20:00         ` [ltt-dev] Porting "jump labels" to userspace (was: Re: LTTng-UST vs SystemTap userspace tracing benchmarks) Mathieu Desnoyers
2011-02-16 20:04           ` Roland McGrath
2011-02-16 20:17             ` [ltt-dev] Porting "jump labels" to userspace David Daney
2011-02-16 20:39               ` Mathieu Desnoyers
2011-02-16 20:45                 ` Thomas Gleixner
2011-02-16 21:42                   ` Peter Zijlstra
2011-02-17 13:58                     ` Ingo Molnar
2011-02-16 20:14           ` David Daney
2011-02-16 20:36             ` Mathieu Desnoyers
2011-02-16 20:55         ` [ltt-dev] LTTng-UST vs SystemTap userspace tracing benchmarks Stefan Hajnoczi
2011-02-16 21:05           ` Mathieu Desnoyers
2011-02-16 21:16           ` Mark Wielaard
2011-02-15 17:03 ` Mark Wielaard
2011-02-16 15:30 ` Tom Tromey
2011-02-16 18:19   ` Roland McGrath
2011-02-17 17:33   ` Julien Desfossez [this message]
2011-02-17 19:11     ` Josh Stone
2011-02-17 19:33       ` Julien Desfossez
2011-02-17 19:47         ` Josh Stone

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