| From: | Heikki Linnakangas <heikki(at)enterprisedb(dot)com> |
|---|---|
| To: | Simon Riggs <simon(at)2ndquadrant(dot)com> |
| Cc: | PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Maximum reasonable bgwriter_delay |
| Date: | 2007-06-19 20:09:44 |
| Message-ID: | 46783808.1040900@enterprisedb.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-hackers |
Simon Riggs wrote:
> On Tue, 2007-06-19 at 15:53 +0100, Heikki Linnakangas wrote:
>> The maximum for bgwriter_delay is currently 10 seconds. That's a long
>> time, and in fact if you set it to a value greater than 1 s, the sleep
>> is split into 1 s intervals with a call to AbsorbFsyncRequests in
>> between them.
>>
>> Is there a use case for a setting > 1 s? We could simplify that logic a
>> little bit if we just set the maximum at 1 s.
>
> Laptop mode? Linux has it...
Granted, though you're still going to wake up every second, so I'm not
sure how much it helps with battery life.
(/proc/sys/vm/laptop_mode won't make a difference here, AFAICS.)
--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com
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