From: compudj@krystal.dyndns.org (Mathieu Desnoyers)
Subject: [ltt-dev] Need for zipped traces ?
Date: Tue, 4 Aug 2009 09:41:26 -0400 [thread overview]
Message-ID: <20090804134126.GD23807@Krystal> (raw)
In-Reply-To: <68119.30361.qm@web63207.mail.re1.yahoo.com>
* Ajit R (ajitrzid at yahoo.com) wrote:
>
> Hi
> Just wondering if zipping traces as they are being generated makes sense. This would be useful on embedded targets which could quickly run out of resources.
>
It could, but it requires extra CPU time while tracing.
I would rather use something based on gzip (zlib1). Using the most
lightweight compression levels should be able to compress one subbuffer
after another without wasting too much resources.
However, with the recent LTTng versions, given we use zero-copy splice
to write to disk, the "easy way" to do it (maybe not the best) is to
write data to a temporary file (which will stay in the buffer cache),
compress it and append it to the tracefile, and clear the temporary
file.
All this can be done by modifying lttd.
Mathieu
> Thanks
> Ajit
>
>
>
>
> _______________________________________________
> ltt-dev mailing list
> ltt-dev at lists.casi.polymtl.ca
> http://lists.casi.polymtl.ca/cgi-bin/mailman/listinfo/ltt-dev
>
--
Mathieu Desnoyers
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68
prev parent reply other threads:[~2009-08-04 13:41 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-08-04 13:28 Ajit R
2009-08-04 13:41 ` Mathieu Desnoyers [this message]
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