Re: [PATCH] BUG 11786 - squid: Remove setting for filter processes the number of Squid processes

[Matthias Fischer <matthias.fischer@ipfire.org>]

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On 30.10.2018 17:05, Michael Tremer wrote:
> On Tue, 2018-10-30 at 15:37 +0100, Matthias Fischer wrote:
>> On 30.10.2018 15:03, Michael Tremer wrote:
>> > Hey,

Hi,

> ...
> Looking at the options that we have (
> http://www.squid-cache.org/Doc/config/url_rewrite_children/), could you please
> test this:
> 
>   url_rewrite_children X startup=N idle=N queue-size=64
> 
> With N being the number of cores that your system has. I do not think that there
> is any point in trying to run more than N queries at a time.
> 
> But squid doesn't start anything when it starts up. startup= changes that and
> idle= makes sure that all processes remain active.
> 
> A queue size of 64 seems sensible to me because that is probably what the
> average tabloid newspaper page has. Maybe it should be 16 * N or so...
> ...
I tested this quite a while now. If I set 'queue-size' to 64, there will
be occasional warnings:

...
2018/12/15 14:10:59 kid1| comm_udp_sendto FD 8, (family=2) 127.0.0.1:53:
(1) Operation not permitted
2018/12/15 14:10:59 kid1| idnsSendQuery FD 8: sendto: (1) Operation not
permitted
2018/12/15 14:11:09 kid1| comm_udp_sendto FD 8, (family=2) 127.0.0.1:53:
(1) Operation not permitted
2018/12/15 14:11:09 kid1| idnsSendQuery FD 8: sendto: (1) Operation not
permitted
2018/12/15 14:11:19 kid1| comm_udp_sendto FD 8, (family=2) 127.0.0.1:53:
(1) Operation not permitted
2018/12/15 14:11:19 kid1| idnsSendQuery FD 8: sendto: (1) Operation not
permitted
...

With a value of '128' these warnings do not occur.

Running on Duo Box.

Corresponding 'squid.conf' line, latest 'squid 4.4', 32bit:

...
url_rewrite_children 2 startup=2 idle=2 queue-size=128
...

Best,
Matthias