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Re: futex

From: Manfred Spraul <manfred(at)colorfullife(dot)com>
To: Josh Berkus <josh(at)agliodbs(dot)com>
Cc: pgsql-hackers(at)postgresql(dot)org, mendola(at)bigfoot(dot)com
Subject: Re: futex
Date: 2004-08-25 17:14:53
Message-ID: 412CC90D.5060005@colorfullife.com (view raw or flat)
Thread:
Lists: pgsql-hackers
Josh Berkus wrote:

>Gaetano,
>
>  
>
>>I knew there was an evaluation on the futex vs spinlock,
>>and Josh Berkus on IRC told me that there was only a 20%
>>performance increase, is this increase to throw away ?
>>    
>>
>
>Before we get totally off track here ....
>
>I evaluated futexes strictly as an attempt to solve the context switch storm 
>bug.   I did NOT test whether they improved performance overall.
>
>  
>
What did you test exactly and could you explain a bit about the context 
switch storm?
Did you use the futex interface directly or pthread_rwlock_rdlock?

--
    Manfred

In response to

  • Re: futex at 2004-08-25 01:43:14 from Josh Berkus

Responses

  • Re: futex at 2004-08-25 17:27:11 from Josh Berkus

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