From: John Levon <levon@movementarian.org>
To: linux-kernel@vger.kernel.org
Cc: willy@debian.org
Subject: flock(fd, LOCK_UN) taking 500ms+ ?
Date: Wed, 2 Oct 2002 03:39:01 +0100 [thread overview]
Message-ID: <20021002023901.GA91171@compsoc.man.ac.uk> (raw)
In 2.5.40, our application is getting seemingly very large
flock(LOCK_UN) latencies :
Unlock, took 541386 usecs
Old was 567999237 secs, 131042 usecs
now is 567999237 secs, 672428 usecs
Unlock, took 125083 usecs
Old was 567999237 secs, 699310 usecs
now is 567999237 secs, 824393 usecs
Unlock, took 151245 usecs
Old was 567999237 secs, 825119 usecs
now is 567999237 secs, 976364 usecs
(using gettimeofday ...)
No similar times are observed during the corresponding LOCK_EX call.
Is this just a silly app bug somewhere, or something funny in locks.c ?
More details, testing etc. on request ...
regards
john
--
"I never understood what's so hard about picking a unique
first and last name - and not going beyond the 6 character limit."
- Toon Moene
next reply other threads:[~2002-10-02 2:33 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-10-02 2:39 John Levon [this message]
2002-10-02 3:23 ` flock(fd, LOCK_UN) taking 500ms+ ? John Levon
2002-10-02 13:14 ` Matthew Wilcox
2002-10-02 17:04 ` Andrew Morton
2002-10-02 18:30 ` Matthew Wilcox
2002-10-02 18:58 ` John Levon
2002-10-02 19:10 ` Robert Love
2002-10-02 19:21 ` Robert Love
2002-10-02 19:23 ` Andrew Morton
2002-10-02 20:05 ` Matthew Wilcox
-- strict thread matches above, loose matches on Subject: below --
2002-10-02 21:36 Manfred Spraul
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