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Re: #15646 BerkeleyDB hybrid mutexes

To: OpenLDAP Devel <openldap-devel@openldap.org>
Subject: Re: #15646 BerkeleyDB hybrid mutexes
From: Howard Chu <hyc@symas.com>
Date: Mon, 08 Oct 2007 21:05:45 -0700
In-reply-to: <470AFD53.3090202@highlandsun.com>
References: <470AFD53.3090202@highlandsun.com>
User-agent: Mozilla/5.0 (X11; U; Linux i686; rv:1.9a8pre) Gecko/2007091708 SeaMonkey/2.0a1pre

Howard Chu wrote:

Fyi, hybrid mutex support in BDB 4.6.21 is still not a good idea on 2.6 Linux systems.

And just to be clear, because I probably didn't include enough context above - the "fix" for the poor locking behavior in 4.6.19 was just the addition of a yield() call in the spinlock loop, and yield() is known to have very poor behavior on 2.6 Linux NPTL systems. -- -- Howard Chu Chief Architect, Symas Corp. http://www.symas.com Director, Highland Sun http://highlandsun.com/hyc/ Chief Architect, OpenLDAP http://www.openldap.org/project/

References:
- #15646 BerkeleyDB hybrid mutexes
  - From: Howard Chu <hyc@highlandsun.com>

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