From: Venkatesh Srinivas <me@endeavour.zapto.org>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
Subject: [9fans] LOCK XADD for i386 incref/decref
Date: Wed, 28 Apr 2010 15:16:28 -0400 [thread overview]
Message-ID: <u2vf75780241004281216q98cedf0bpa528b406a4f833ff@mail.gmail.com> (raw)
In-Reply-To: <r2zf75780241004281003ua9c23045xc4831f3735477989@mail.gmail.com>
Hi,
A few months ago, I added a patch to inferno-npe to use LOCK XADD
instead of the current lock/add/unlock sequence for incref and decref:
(http://code.google.com/p/inferno-npe/source/detail?r=b83540e1e77e62a19cbd21d2eb54d43d338716a5
and http://code.google.com/p/inferno-npe/source/detail?r=82f13e6755218ecb7dec0f1392b2eb8bfe0bb2c7).
On a 2.66 GHz Core 2 Duo, we noticed a full 14% reduction in runtime
(9.6s vs 11.2s) of the thread-ring test. Similar performance gains
were noticed on a Core i7 machine, but I no longer have the numbers
handy.
Perhaps this change is interesting for Plan 9...
-- vs
next parent reply other threads:[~2010-04-28 19:16 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <r2zf75780241004281003ua9c23045xc4831f3735477989@mail.gmail.com>
2010-04-28 19:16 ` Venkatesh Srinivas [this message]
2010-04-29 2:39 ` Federico G. Benavento
2010-04-29 2:46 ` Federico G. Benavento
2010-09-07 19:48 ` erik quanstrom
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