From: Torvald Riegel <triegel@redhat.com>
To: Waiman Long <longman@redhat.com>
Cc: Florian Weimer <fw@deneb.enyo.de>,
GLIBC Devel <libc-alpha@sourceware.org>,
Carlos O'Donell <codonell@redhat.com>
Subject: Re: [PATCH v2] rwlock: Fix explicit hand-over.
Date: Thu, 06 Apr 2017 10:47:00 -0000 [thread overview]
Message-ID: <1491475613.5374.99.camel@redhat.com> (raw)
In-Reply-To: <58a61371-e31e-055a-d561-c0e1c13eb7c1@redhat.com>
On Mon, 2017-03-27 at 14:59 -0400, Waiman Long wrote:
> Just found out that there is a regression in performance when in writer
> preferring mode. The average per-thread throughput was 4,733 ops/s with
> the old glibc, but 2,300 ops/s with the new implementation vs 32,584
> ops/s for the reader-preferring mode.
Thanks for the note. How large is the performance difference for
different numbers of threads? Is the old rwlock always faster in
writer-preferring mode?
next prev parent reply other threads:[~2017-04-06 10:47 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-25 19:50 [PATCH] " Torvald Riegel
2017-03-25 20:17 ` Florian Weimer
2017-03-25 20:39 ` Torvald Riegel
2017-03-25 23:01 ` [PATCH v2] " Torvald Riegel
2017-03-27 16:09 ` Waiman Long
2017-03-27 17:54 ` Torvald Riegel
2017-03-27 18:16 ` Waiman Long
2017-03-27 18:59 ` Waiman Long
2017-03-27 19:11 ` Waiman Long
2017-04-06 10:51 ` Torvald Riegel
2017-04-06 10:47 ` Torvald Riegel [this message]
2017-04-06 10:51 ` Ping! " Torvald Riegel
2017-07-28 5:41 ` Carlos O'Donell
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