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From Leon Rosenberg <rosenberg.l...@gmail.com>
Subject Re: Tomcat Performance Turning.
Date Fri, 02 Sep 2011 20:19:19 GMT
Hello Talha,

On Fri, Sep 2, 2011 at 6:16 PM, Talha Fazal <tfazal@credera.com> wrote:
> PLEASE SEE MY ANSWERS BELOW IN UPPER CAPS.
>
> ONE IMPORTANT OBSERVATION: Even though, tomcat's response time is decent, for some reason,
apache is taking a lot longer to serve requests. We are using mod_jk with Tomcat using AJP1.3
protocol in the connector setting in server.xml. We plan to try mod_proxy_ajp and mod_proxy
instead of mod_jk. Any thoughts here?

Interesting observation. Have you tried running directly against
tomcat without apache inbetween?
<holywar>from my experience there is no need for apache in your setup
anyway </holywar>.

In the past we used both mod_jk and mod_proxy_ajp, and even
mod_proxy_ajp is somewhat faster, the difference where never 17
seconds.
Your best guess would probably be to test without httpd to rule out if
tomcat or httpd is the bottleneck.

regards
Leon

>
> Thanks,
>
>
> -----Original Message-----
> From: R Batchelor [mailto:rsbatch8@yahoo.com]
> Sent: Friday, September 02, 2011 10:10 AM
> To: Tomcat Users List
> Subject: Re: Tomcat Performance Turning.
>
> Have you ruled out issues with db connection pooling? NO. IN FACT, THERE ARE KNOWN DBCP
CONNECTION POOLING DEADLOCK ISSUES IN TOMCAT 6.0.26 [https://issues.apache.org/jira/browse/DBCP-270].
I AM LOBBYING TO UPGRADE TO TOMCAT 7.0.20 AND USE THE JDBC CONNECTION POOL INSTEAD OF DBCP
CONNECTION POOL.
>
> You might consider setting your dbcp maxWait to 8000 or less and watch
> for "timeout waiting for idle object" exceptions.  Also, you could
> monitor database connections/active-users on the DB side to see if your
> dbcp pools are max'd but all the database users/connections are idle.
> These can be symptoms of an application mis-managing its dbcp pools.
> I WILL DEFINITELY TRY THIS OUT. THANKS!
>
> ________________________________
> From: Leon Rosenberg <rosenberg.leon@gmail.com>
> To: Tomcat Users List <users@tomcat.apache.org>
> Sent: Friday, September 2, 2011 7:55 AM
> Subject: Re: Tomcat Performance Turning.
>
> Hello Talha,
>
> well... the quickshots are through.
> You should really create some threaddumps after each other (for
> example with jstack) and try to find out which thread is slowing the
> app down.
> For starters you could try with code you changed for tomcat
> adaptations if any. The problem seems to lie beneath the surface, so
> you will have to start
> performance monitoring and look into the inside.
> However, time difference of 17 seconds must be something very very
> obvious like a synchronized block in a valve/filter, db lock (have you
> checked the db locks?), or an if (tomcat)
> Thread.sleep(1000L*60*17);....
>
> regards
> Leon
>
> On Fri, Sep 2, 2011 at 4:21 PM, Talha Fazal <tfazal@credera.com> wrote:
>> Hi Leon,
>>
>> Please see any answers in CAPS below.
>>
>>
>>
>> -----Original Message-----
>> From: Leon Rosenberg [mailto:rosenberg.leon@gmail.com]
>> Sent: Friday, September 02, 2011 9:06 AM
>> To: Tomcat Users List
>> Subject: Re: Tomcat Performance Turning.
>>
>> Hello Talha,
>>
>> seems that your tomcats are fine.
>> Question, you mention that the tomcat do not perform, but you don't
>> tell us how you come to this conclusion except for cpu load. ANSWER: LOOKING INTO
THE TOMCAT ACCESS LOGS, THE RESPONSE TIME (%D) IS HORRIBLE).
>> What is the difference in response times between weblogic and tomcat? ANSWER: FOR
PAGES THAT WEBLOGIC SERVES IN 500 ms ON AVERAGE, TOMCAT IS TAKING 17000 ms ON AVERAGE.
>> Maybe your tomcat just perform the job MUCH faster ;-)
>> The thread dump you posted in another reply indicates that your
>> tomcats are idling.
>> Do you have manager installed? NO. With manager you could monitor active
>> connections and requests.
>> Do you have probe installed? YES, WE HAVE IT INSTALLED. A LOT OF THREADS ARE IDLING
IS WHAT WE OBSERVE.
>> Finally, if you really want to profile your application, do you have
>> moskito installed? :-) (the one i initially wrote
>> -moskito.anotheria.net, therefore the shameless advertisement). :-) SURE WILL GIVE
IT A TRY [TIME PERMITTING].
>>
>> In the last case I can offer you to provide support getting it running. WILL LET
YOU KNOW IF WE ARE INTERESTED. THANKS.
>>
>> regards
>> Leon
>>
>> On Fri, Sep 2, 2011 at 3:50 PM, Talha Fazal <tfazal@credera.com> wrote:
>>> Plz. see my answers below in UPPERCAPS.
>>>
>>> Thanks!
>>>
>>> -----Original Message-----
>>> From: Leon Rosenberg [mailto:rosenberg.leon@gmail.com]
>>> Sent: Friday, September 02, 2011 8:35 AM
>>> To: Tomcat Users List
>>> Subject: Re: Tomcat Performance Turning.
>>>
>>> Hello Talha,
>>>
>>> from a quick glance at your post, do you have the same 30 max threads
>>> limit in weblogic? YES.
>>> Because sending 525 users through 2x30=60 max threads seems a little
>>> bottlenecky. I FORGOT TO MENTION THAT ON EACH TOMCAT SERVER, WE ARE RUNNING 3
INSTANCES OF TOMCAT ON EACH OF OUR TOMCAT SERVERS (2 SERVERS), THUS 2*3*30=180 maxThreads.
WE EVEN INCREASED THE maxThreads TO 120 FOR EACH INSTANCE (thus 120*6=720 maxThreads), AND
MATCHED maxActive IN JNDI RESOURCE TO 120, BUT WE STILL DIDN'T SEE CONSIDERABLE IMPROVEMENT.
THE CPU USAGE INCREASED FROM 7% to 10%.
>>>
>>> Which software are you using to produce the load? LOADRUNNER. Does it keepalive
the connections? YES.
>>>
>>> regards
>>> Leon
>>>
>>> On Fri, Sep 2, 2011 at 3:31 PM, Talha Fazal <tfazal@credera.com> wrote:
>>>> Background:
>>>>
>>>> We have a moderately high traffic web application (between 8 to 21 million
hits/day) running Apache to serve static content (also to load balance and create a DMZ) and
Weblogic to serve dynamic content (Struts 1.1 based Java web application).
>>>> We are trying to replace Weblogic with Tomcat and we have ported our code
to work with Tomcat. All works well in Tomcat in the DEV, QA, and STAGING environment as long
as there is no real load.
>>>>
>>>> The Issue - Load Testing:
>>>>
>>>> In our staging environment for load testing, when we run the load test using
525 concurrent users, the app doesn't perform at all. The CPU usage (on Apache and Tomcat
Servers) hovers between 7% to 8%. The database server CPU usage is also between 4 and 5%.
>>>>
>>>> Setup for Load Testing:
>>>>
>>>> We have setup 2 apache web servers (4 Quad Processors i.e. 16 CPUs each),
2 Tomcat (version 6.0.29) servers (4 Quad Processors i.e. 16 CPUs each). Each server has 32
Gb ram. We are using AJP 1.3 to connect Tomcat and Apache.
>>>>
>>>> Mentioned below is the version information:
>>>> Apache Version 2.2.14 (with mod_jk module)
>>>> Tomcat: 6.0.29
>>>> Database: Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bits
>>>> Connection Pool: DBCP.
>>>>
>>>> Mentioned below are connector settings in conf/server.xml:
>>>>
>>>>  <Connector
>>>>        address="stagingTCserver01"
>>>>        backlog="300"
>>>>        connectionTimeout="60000"
>>>>        enableLookups="false"
>>>>        maxPostSize="2097152"
>>>>        maxSpareThreads="10"
>>>>        maxThreads="30"
>>>>        minSpareThreads="5"
>>>>        port="8006"
>>>>        protocol="AJP/1.3"
>>>>        tcpNoDelay="true"
>>>>    />
>>>>
>>>> Mentioned below are the settings for JNDI resource configured in conf/context.xml:
>>>>
>>>>  <Resource
>>>>        name="jdbc/onlinedb"
>>>>        auth="Container"
>>>>        type="javax.sql.DataSource"
>>>>        driverClassName="oracle.jdbc.OracleDriver"
>>>>        url="jdbc:oracle:thin:@192.168.12.10:1521:WEBDB"
>>>>        initialSize="1"
>>>>        maxActive="30"
>>>>        minIdle="1"
>>>>        maxIdle="5"
>>>>        maxWait="300000"
>>>>        poolPreparedStatements="true"
>>>>        maxOpenPreparedStatements="300"
>>>>        validationQuery="SELECT 1 FROM BB_DUAL"
>>>>        testOnBorrow="true"
>>>>        validationInterval="10000"
>>>>        testWhileIdle="true"
>>>>    />
>>>>
>>>> JVM Parameters:
>>>>
>>>> -Xms512m -Xmx2048m
>>>> -XX:PermSize=128m -XX:MaxPermSize=256m
>>>> -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/logs/WL2TC/app/
>>>> -verbose:gc -Xloggc:/logs/WL2TC/app/WL2TC_1-gc.log
>>>>
>>>> It must be noted that Weblogic setup performs very well using similar settings.
>>>>
>>>> Garbage Collection: While the load test is running, Garbage collection works
just fine i.e. Young GC occurring every 2-3 minutes and takes less than half a second. Full
GC occurs every hour and takes a little over 2 seconds.
>>>>
>>>> Any tips/pointers will be greatly appreciated.
>>>>
>>>> Talha.
>>>>
>>>
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