Re: [squid-users] restart url_redirector processe when it dies

On Mar 16, 2009, at 8:13 PM, Amos Jeffries wrote:

>> To elaborate, squid should restart new url_rewrite_program instances
>> when the number of live children falls to <= 50% of the configured
>> number. So once 8 processes out of 15 die, squid should launch a
>> whole
>> new set of 15. You'll then have 23 url_rewriter processes, but squid
>> will launch 15 more when they die and only 7 are left. The circle of
>> life continues...
>
> PS: yes that is a known bug. Squid should only start the 8 dead ones
> back.
> It's on the queue for fixing one day.
>
>>
>> In squid 2.7, if you don't want to wait for half your helpers to die
>> before squid launches more, you can adjust the threshold in
>> helper.c:helperServerFree() by changing the following line:
>>
>> if (hlp->n_active <= hlp->n_to_start / 2) {
>>
>> And changing the right size of the evaluation from "/ 2" to, say,
>> "* .
>> 75" or similar.
>>
>> This can be used as a somewhat ghetto way of dealing with a rewriter
>> that has a memory leak - put a dead-man's counter into the rewriter
>> that causes the process to exit after X number of requests, and let
>> squid launch new ones as needed. (Not that I've ever done anything
>> like that myself, nosiree...)
>>
>
> Hmm, inspiration for a new idea and explanation of a bug in one post.
> Thank you very much.

Not a problem - I guess you can consider this a feature request to
make that threshold tunable in squid.conf :)

-C

>
> Amos
>
>> -C
>>
>> On Mar 15, 2009, at 5:14 AM, Amos Jeffries wrote:
>>
>>> Dieter Bloms wrote:
>>>> Hi,
>>>> I use an url_rewrite_program, which seems to die after about 400000
>>>> requests.
>>>> Squid starts 15 processes, which are enough, but after some time
>>>> one
>>>> process after another die and at the end all processes where gone.
>>>> Is it possible to let squid restart an url_rewrite_program, when it
>>>> dies ?
>>>
>>> What version of Squid are you using that does not do this restart
>>> automatically?
>>> Squid only dies when ALL helpers for a needed service are dying too
>>> fast to recover quickly.
>>>
>>> Amos
>>> --
>>> Please be using
>>> Current Stable Squid 2.7.STABLE6 or 3.0.STABLE13
>>> Current Beta Squid 3.1.0.6
>>>
>>
>>
>
>
Received on Tue Mar 17 2009 - 03:33:16 MDT