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Re: Defaulting wal_sync_method to fdatasync on Linux for 9.1?

From: Mladen Gogala <mladen(dot)gogala(at)vmsinfo(dot)com>
To: Josh Berkus <josh(at)agliodbs(dot)com>
Cc: "pgsql-performance(at)postgresql(dot)org" <pgsql-performance(at)postgresql(dot)org>
Subject: Re: Defaulting wal_sync_method to fdatasync on Linux for 9.1?
Date: 2010-11-17 00:05:05
Message-ID: 4CE31C31.6090108@vmsinfo.com (view raw or flat)
Thread:
Lists: pgsql-performance
Josh Berkus wrote:
> On 11/16/10 12:39 PM, Greg Smith wrote:
>   
>> I want to next go through and replicate some of the actual database
>> level tests before giving a full opinion on whether this data proves
>> it's worth changing the wal_sync_method detection.  So far I'm torn
>> between whether that's the right approach, or if we should just increase
>> the default value for wal_buffers to something more reasonable.
>>     
>
> We'd love to, but wal_buffers uses sysV shmem.
>
>   
Speaking of the SYSV SHMEM, is it possible to use huge pages?

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Mladen Gogala 
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Subject: Re: Defaulting wal_sync_method to fdatasync on Linux for 9.1?
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