Date: Sat, 17 May 2008 01:53:04 +0100 From: Thomas Hurst <tom.hurst@clara.net> To: Evren Yurtesen <yurtesen@ispro.net> Cc: Jeremy Chadwick <koitsu@FreeBSD.org>, freebsd-stable@freebsd.org Subject: Re: Approaching the limit on PV entries, consider increasing either the vm.pmap.shpgperproc or the vm.pmap.pv_entry_max sysctl. Message-ID: <20080517005304.GA63122@voi.aagh.net> In-Reply-To: <482DD410.6090102@ispro.net> References: <482B4DEE.3050705@ispro.net> <20080515010347.GA85202@eos.sc1.parodius.com> <482BE398.8010203@ispro.net> <20080516182044.GA5921@voi.aagh.net> <482DD410.6090102@ispro.net>
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* Evren Yurtesen (yurtesen@ispro.net) wrote:
> How do I see what process is sharing memory and how much memory?
Guessing is normally sufficient; typically it's processes with the same
name and similar size/res. On 7-STABLE you can use procstat -v to look
at the VM mappings for a process, but typically that'll be overkill.
> There are a bunch of apache 2.2 processes working normally about 20-30
> processes. This box doesnt do much more than that...
>
> I just checked the machine and here is what it looks like:
> 2:32PM up 18 days, 5:40, 3 users, load averages: 0.41, 0.36, 0.27
>
> web:/root#ps ax |grep http
> 21429 ?? Ss 0:18.08 /usr/local/sbin/httpd
> 86473 ?? S 0:00.09 /usr/local/sbin/httpd
> 86659 ?? S 0:00.09 /usr/local/sbin/httpd
>
> Although I see now that for 2 days the PV entries error did not appear. I
> wonder if it is spooling up somehow...
They do look a bit small to be triggering it; assuming they're sharing
most of that, that's still only about 400k pv entries; 5MB or so (12
bytes per entry). The systems I've seen pv entries run out on run to a
couple of orders of magnitude more than that.
> There is a cron job restarting apache everyday at midnight so it cant
> be apache leaking perhaps.
Load spikes maybe? Child count running into the stratosphere? Big PHP
opcode cache?
--
Thomas 'Freaky' Hurst
http://hur.st/
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