OK - thanks. I will pass it on.
-----Original Message-----
From: web400-bounces@xxxxxxxxxxxx [mailto:web400-bounces@xxxxxxxxxxxx] On Behalf Of Jeffrey Day
Sent: 07 January 2011 18:35
To: 'Web Enabling the AS400 / iSeries'
Subject: Re: [WEB400] Summing up the Icebreak discussion
Hi Kevin,
Given that you are indeed getting MCH3601 or messages like:
(HTP8081) HTTP Server instance <instance name>, a thread failed.
(HTP8080) HTTP Server instance <instance name>, hot backup takeover.
then I'd up it about 10%, so if its "ThreadsPerChild 100", I'd try "ThreadsPerChild 110" for a week or two, and monitor it.
As you pointed out, it doesn't occur regularly, it is a volume of activity issue. At some point, there is too much activity, which causes the error. If it continues to happen, I'd suggest upping it another 10%. You should see this error occur less frequently, as you raise the ThreadsPerChild value.
Thanks,
Jeff
From: Kevin Turner <kevin.turner@xxxxxxxxxxxxxxx>
To:"'Web Enabling the AS400 / iSeries'" <web400@xxxxxxxxxxxx>
Date: 1/7/2011 12:26 PM
Subject: Re: [WEB400] Summing up the Icebreak discussion
Interesting. Jeffrey Day also asked about the ThreadsPerChild setting.
I have had a quick check and it seems that on IBMs recommendation (it was something they changed when trying to diagnose matters) they have the following settings:
MaxCGIJobs 100
ThreadsPerChild 100
Prior to that the defaults were in place.
-----Original Message-----
From: web400-bounces@xxxxxxxxxxxx [mailto:web400-bounces@xxxxxxxxxxxx] On Behalf Of Nathan Andelin
Sent: 07 January 2011 16:06
To: Web Enabling the AS400 / iSeries
Subject: Re: [WEB400] Summing up the Icebreak discussion
Kevin,
In the case that I referred to earlier, we set ThreadsPerChild to 3000, and over
a period of time the CGI jobs grow. We use a dispatcher architecture similar to
yours.
-Nathan
----- Original Message ----
From: Kevin Turner <kevin.turner@xxxxxxxxxxxxxxx>
To: Web Enabling the AS400 / iSeries <web400@xxxxxxxxxxxx>
Sent: Fri, January 7, 2011 1:35:16 AM
Subject: Re: [WEB400] Summing up the Icebreak discussion
Hi Nathan
Some installations run with the despatcher (the data queue isolating the CGI
stuff from the Apache thread) and some do not. In this case they do not - the
programs are all running in the thread. They are going to switch to use the
despatcher this month to see if it improves matters.
The odd thing is that it will behave for a week or so and then suddenly start to
issue thread failure messages to the QSYSOPR message queue. Sometimes that just
stops and other times it escalates until the server just crashes completely and
has to be restarted. I am sorry I haven't got the job log messages to hand, but
they are occurring in the bowels of the Apache software somewhere. It all sounds
like some sort of memory leak issue, but we haven't isolated one in the
application yet. IBM were not much help either.
"1-2 thousand CGI server jobs". Wow! No, nothing of that magnitude. They have
max out at just over a 1000 concurrent sessions during the day - about 3-400
call centre agents I guess, each with an average of 2 sessions (some more).
Those sessions are usually served by a 100 or so CGI threads - could be more but
certainly not a 1-2 thousand. That is an enormous number - are they running
persistent CGI?
Cheers
Kevin
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