Re: Worker MPM configuration with High Load

[Harsimranjit singh Kler <simran4u2@xxxxxxxxx>]

Hi Jeff

 

Whenever i am increasing number of worker(tomcat) my response time increased.If i am running 1 tomcat & 1 LB with above configuration and hitting 400 concurrent requests it give me expected response time.when i added one more tomcat (so total 2 worker,1 LB) and hitting concurrent 800 requests my response time increased.i feel some issue at apache configuration so its not forwarding requests properly\timly to tomcat workers and slow down response. please help me out?

 

thanks

harsimran

On Mon, Apr 25, 2011 at 9:03 PM, Jeff Trawick <trawick@xxxxxxxxx> wrote:

On Mon, Apr 25, 2011 at 10:50 AM, Harsimranjit singh Kler
<simran4u2@xxxxxxxxx> wrote:
> Hi Jeff
>
> Thanks for update .I have gone through that Doc.
>
> Above configurations working for me Still i have some specific
> questions..:-)
> 1)Is it good to increase min\maxSparethread for increasing response time?

see if there is significant httpd child process creation/termination;
if so, these can be adjusted to reduce that

> And what should MaxRequestsPerChild?

0, unless you have a specific problem you're trying to work around

> 2)AJP ports should different for all tomcat worker ?
> 3)Why apache not complain(no error log) if we provide wrong configurations
> in worker properities for particular worker?

maybe there is a better mailing list for mod_jk?

>
>
> Thanks
>
>
> On Thu, Apr 21, 2011 at 4:50 PM, Jeff Trawick <trawick@xxxxxxxxx> wrote:
>>
>> On Wed, Apr 20, 2011 at 11:55 PM, Harsimranjit singh Kler
>> <simran4u2@xxxxxxxxx> wrote:
>>
>> > ServerLimit 30
>> > StartServers 20
>> > MaxClients 1500
>> > MinSpareThreads 40
>> > MaxSpareThreads 100
>> > ThreadsPerChild 50
>> > MaxRequestsPerChild 0
>>
>> > 1)i am hitting with 1500 concurrent user.is this configuration fine?
>>
>> you encountered the "reached maxclients" condition with MaxClients=1500...
>>
>> whether that is expected is up to your app and the traffic
>>
>> if the app hangs or takes a long time to respond, you could reach the
>> maxclients limit regardless
>>
>> if the app is responding appropriately and your machine has capacity,
>> increase maxclients
>>
>> > 3)I HAVE SET startserver 20(means 20 child processes with 50 thread per
>> > child) .but why am getting 2 with following command
>> >
>> > “ps aux | grep http | grep -v “\(root\|grep\)” | wc -l”–>2
>>
>> you set MaxSpareThreads to 100; that's 2 * your ThreadsPerChild
>>
>> don't worry about StartServers
>>
>> notice that your MinSpareThreads and MaxSpareThreads values and the
>> difference between them are a small percentage of MaxClients; if load
>> changes by a very small percentage, child processes will be terminated
>> or started
>>
>> perhaps this preso would help:
>> http://blogs.sun.com/trawick/resource/DeepDive/WebStackDeepDiveApache.pdf
>>
>> > 4)Any other configuration need to do for worker MPM?
>> >
>> > Thanks a lot in advance
>> >
>> > regards
>> > Harsimran
>>
>>
>>
>> --
>> Born in Roswell... married an alien...
>>
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>

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Born in Roswell... married an alien...

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