[ic] mod_interchange and Apache MaxClients

John1 list_subscriber at yahoo.co.uk
Thu Nov 17 09:09:35 EST 2005

On Thursday, November 17, 2005 1:45 PM, jeff at hisgirlfridays.com wrote:

> On Thu, Nov 17, 2005 at 10:46:37AM -0000, John1 wrote:
>> In effect, I think I have verified that Apache doesn't start
>> responding again even if port 80 were to be blocked.  Once
>> MaxClients has been hit Apache stops servicing requests as it won't
>> spawn any more processes and for whatever reason non of the Apache
>> processes ever die after this point, even if the server is left for
>> many hours over night when I know the traffic to my site is very low
>> indeed.  Ron & Jeff - do you also see this effect?
> Yes, none of the servers die.  I can also add that the event is
> predicated by mod_interchange and IC failing to communicate and
> holding apache children open.  During this initial period, the web
> server will serve non-IC content but any requests for IC pages
> "freeze up".  As requests for IC pages stack up, MaxClients is
> eventually reached and apache stops serving requests entirely.
Thanks for the extra insight.  Are you clear as to whether it is the 
Interchange service that has stopped responding or mod_interchange that is 
failing to communicate with the Interchange service?

> One of the reasons I never mentioned the issue before is because I am
> running the IC 4.8 series .  I am pretty sure a lot of the
> process-forking code was improved between 4.8 and the current version
> and those improvements could very well resolve the issue.
I am using a 5.3.0 nightly build from August 2004, but as far as I can 
remember have always had this problem with previous builds as well.

>> I don't think that the issue is anything to do with my Virtual Server
>> environment, but I thought I better throw it into the mix.
> On my side, the issue has spanned multiple physical servers with
> completely different hardware and multiple versions of linux and
> debian.
Thanks for the info - at least we can now disregard platform issues as a 
likely cause.

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