| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
| Cc: | Peter Geoghegan <peter(at)2ndquadrant(dot)com>, PG Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Reduced power consumption in autovacuum launcher process |
| Date: | 2011-07-18 15:32:39 |
| Message-ID: | 16642.1311003159@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Robert Haas <robertmhaas(at)gmail(dot)com> writes:
> On Mon, Jul 18, 2011 at 10:35 AM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>> A wakeup once every half hour would surely not be an issue from a power
>> consumption standpoint. However, I'm not sure I understand here: aren't
>> we trying to remove the timeouts completely?
> Well, in the case of the AV launcher, the issue is that the main loop
> is timed by definition, cf. autovacuum_naptime, and the WaitLatch()
> interface is apparently designed so that we can't sleep longer than 35
> minutes.
Hmm. Well, it's not too late to rethink the WaitLatch API, if we think
that that might be a significant limitation. Offhand I don't see that
it is, though.
regards, tom lane
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