Re: Tomcat server Performance imporvement required

[André Warnier]

Paul, Subhro wrote:
Thanks Ameer for your reply.
What is the max value we can assign to heap space?

Under a 64-bit OS and a 64-bit JVM, as much as you want (taking into account the amount of 
memory available on the host of course).
Whether that is efficient, is another matter entirely, and depends entirely on the 
characteristics of your own systems and applications. (I am mentioning that to fend off 
your probable next question, which could be along the lines of : what should I allocate in 
my case ? Nobody else but you can answer that one, and you can answer that only after 
monitoring your system while running your applications, over a period of time).

As to how this all works : search Google for "java jvm memory management" and read one of 
the many introductions on the subject.
I find "Memory Management in the Java HotSpot™ Virtual Machine" (a PDF) to be a 
good one.

One more thing : on this forum, it is preferred that you do not "top post", and try to 
keep the conversation in a logical order.  See 
http://tomcat.apache.org/lists.html#tomcat-users
item #6.


Regards,
Subhro Paul

-----Original Message-----
From: Ameer Mawia [mailto:ameer.ma...@gmail.com] 
Sent: Sunday, March 29, 2015 3:02 AM
To: Tomcat Users List
Subject: Re: Tomcat server Performance imporvement required

Email sent from outside of PSEG. Use caution before using links/attachments.


On Mar 29, 2015 2:53 AM, "Paul, Subhro" <subhro.p...@pseg.com> wrote:
Dear Team,

I am an application developer from TCS and working for PSEG (
https://www.pseg.com).
You might have seen my queries which I forwarded on 12 Feb, 2015 for
Tomcat server crashing issue. After that we have added some resources to
the servers. Now we have two Tomcat6 servers each one is having 16GB of RAM
and 8CUPS. All server are Linux 6.5 64 bit OS.
As per application architecture we have two Apache Proxy servers and two
Tomcat servers. Also we have two loadbalancers, one for Proxy loadbalancing
and another for Tomcat loadbalancing. So, when request comes that comes to
proxy loadbalncer first then Apache Proxy server -> Tomcat loadbalancer ->
Tomcat server.
Some days back on 19th and 23rd of March another incident occurs when
server faced some issues again. This time none of the servers where crashed
but for some highly used pages in the site, Apache proxy server started
complaining Timeout which is 60 seconds. After googling we thought we could
increase the Time out in Proxy but client don't accept that.
So we need some tuning parameters on Tomcat server for better
performance. Below are some of the setting parameters from actual server.
Ports are masked.

Initializing param:

JAVA_OPTS="${JAVA_OPTS} -Xms1024M -Xmx1024M"
CATALINA_OPTS="${CATALINA_OPTS} -Xms1024M -Xmx1024M"



Connector Initialization param:

<Connector port="XXXX" protocol="HTTP/1.1"
        connectionTimeout="20000"
        server=" "
        secure="true"
        redirectPort="YYYY"
        maxThreads="512"/>

All other parameters are kept as default.


Also we did some load testing on the servers in Test environment and
found that if we restart the Tomcat server it works absolutely fine but
gradually performance decrease though the garbage collection happening and
very little memory captured by "PS Old Gen'.

You almost HIT the point. You have to allocate more heap space..Xmx..to
your Tomcat JVM, OR else if you can't afford that, then obviously analyse
your application and try reducing the memory footprint.
Is there any other parameters we can add in the servers to increase
performance?
Thanks & Regards,
Subhro Paul



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Regards,
Ameer Mawia


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