Re: SIGUSR1 pingpong between master na autovacum launcher causes crash

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Zdenek Kotala <Zdenek(dot)Kotala(at)Sun(dot)COM>
Cc: Alvaro Herrera <alvherre(at)commandprompt(dot)com>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: SIGUSR1 pingpong between master na autovacum launcher causes crash
Date: 2009-08-24 15:51:54
Message-ID: 12548.1251129114@sss.pgh.pa.us
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Zdenek Kotala <Zdenek(dot)Kotala(at)Sun(dot)COM> writes:
> ... We can see there that AVlauncher really wait 100ms, but it is not enough
> when system is under stress.

OK, thanks for checking that.

> I think that Alvaro's patch is good and it fix a crash problem. I also
> think that AVlauncher could wait little bit more then 100ms. When system
> cannot fork, I don't see any reason why hurry to repeat a fork
> operation. Maybe 1s is good compromise.

Seems reasonable to me. Alvaro, do you want to take care of applying
these three fixes?

regards, tom lane

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