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From "Rahul Tandon" <rahul.tan...@flextrade.com>
Subject RE: tomcat 5.5
Date Thu, 15 Mar 2007 15:38:02 GMT
Thanks rashmi. After trial and error I found out that 704m is fine but 768
is giving me trouble. I would check the link that you send.

Thanks again.

 

Rahul Tandon

516-627-8993 Xtn 208

rahul.tandon@flextrade.com

 

111 Great Neck Rd.,Suite #314

Great Neck, NY 11021

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-----Original Message-----
From: Rashmi Rubdi [mailto:dev_subscriptions@yahoo.com] 
Sent: Thursday, March 15, 2007 11:24 AM
To: Tomcat Users List
Subject: Re: tomcat 5.5

I think you do have the Native library, but since you're getting
OutOfMemoryError the garbage collector is unable to free additional memory
for further work, and this is why the application hangs.

This article
http://www.adobe.com/cfusion/knowledgebase/index.cfm?id=tn_17470 explains it
well.

One suggestion made in the above aritcle would be to gradually increase the
memory, by trial and error until you don't get the OutOfMemoryError, since
the memory setting you have right now is not working out. 

-Rashmi

----- Original Message ----
From: Rahul Tandon <rahul.tandon@flextrade.com>
To: Tomcat Users List <users@tomcat.apache.org>
Sent: Thursday, March 15, 2007 11:08:29 AM
Subject: RE: tomcat 5.5


Thanks Rashmi for the suggestion. My application is using (some time) quite
a big memory (I need 1GB once in a while!!!), that's why I wanted to have
this setting.
One other thing I notice(which I am not sure of), will this error would have
any effect:

The Apache Tomcat Native library which allows optimal performance in
production environments was not found


Thanks again.



Rahul Tandon

516-627-8993 Xtn 208

rahul.tandon@flextrade.com



111 Great Neck Rd.,Suite #314

Great Neck, NY 11021

This communication is for informational purposes only. The contents of this
transmission are confidential and are intended solely for the use of the
individual or entity to whom they are addressed.If you have received this
email in error please notify the sender by return email and delete this
message from your system. Flextrade Systems Inc., its subsidiaries and
affiliates do not guarantee the completeness and accuracy of this
transmission's contents. Moreover, Flextrade Systems Inc., its subsidiaries
and affiliates do not guarantee this communication to be free of viruses and
accept no liability for any damage caused thereof.


-----Original Message-----
From: Rashmi Rubdi [mailto:dev_subscriptions@yahoo.com] 
Sent: Thursday, March 15, 2007 10:59 AM
To: Tomcat Users List
Subject: Re: tomcat 5.5

I think trying to increase the memory configuration in any application
doesn't necessarily contribute to it's speed because the garbage collector 
does not perform serious attempts to release memory until the heap size
limit is reached. 

So, having a lower heap size limit (lower max memory setting), ensures that
the garbage collector releases as much memory as possible in a shorter
interval and having a higher memory setting significantly delays the garbage
collection. 

My suggestion is that it is better to keep the original memory settings than
increase it, and only increase it if your project is too large or resource
intensive and requires additional memory and not because there's plenty of
memory available - why not use it.

-Rashmi


----- Original Message ----
From: Rahul Tandon <rahul.tandon@flextrade.com>
To: Tomcat Users List <users@tomcat.apache.org>
Sent: Thursday, March 15, 2007 10:25:22 AM
Subject: tomcat 5.5


Hi,

I had posted this yesterday and got some feedback from chuck, but still
there is no concrete resolution to the problem, if somebody knows anything
about this kind of issue, please help me.





I am using following configuration:



Red Hat Enterprise Linux AS release 3 (Taroon Update 4)



4GB RAM



Tomcat version 5.5



Java version "1.5.0_06"



Tomcat connectors setting: maxThreads="150" minSpareThreads="25"
maxSpareThreads="75"

ulimit -a also seems ok:



core file size        (blocks, -c) unlimited

data seg size         (kbytes, -d) unlimited

file size             (blocks, -f) unlimited

max locked memory     (kbytes, -l) 4

max memory size       (kbytes, -m) unlimited

open files                    (-n) 1024

pipe size          (512 bytes, -p) 8

stack size            (kbytes, -s) 10240

cpu time             (seconds, -t) unlimited

max user processes            (-u) 7168

virtual memory        (kbytes, -v) unlimited







. I am using CATALINA_OPTS "-Xms512m -Xmx512m -Djava.awt.headless=true" and

tomcat comes up fine and my http requests are processed normal.



            If I change memory setting to 1024m (-Xmx1024m -Xms512m) then I

am getting this error:





java.lang.reflect.InvocationTargetException

        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

        at

sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39

)

        at

sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl

.java:25)

        at java.lang.reflect.Method.invoke(Method.java:585)

        at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:275)

        at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)

Caused by: java.lang.OutOfMemoryError: unable to create new native thread

        at java.lang.Thread.start0(Native Method)

        at java.lang.Thread.start(Thread.java:574)

        at

org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.<init>(ThreadPool.

java:643)

        at

org.apache.tomcat.util.threads.ThreadPool.openThreads(ThreadPool.java:515)

        at

org.apache.tomcat.util.threads.ThreadPool.start(ThreadPool.java:148)

        at

org.apache.tomcat.util.net.PoolTcpEndpoint.startEndpoint(PoolTcpEndpoint.jav

a:315)

        at

org.apache.coyote.http11.Http11BaseProtocol.start(Http11BaseProtocol.java:15

0)

        at

org.apache.coyote.http11.Http11Protocol.start(Http11Protocol.java:75)

        at

org.apache.catalina.connector.Connector.start(Connector.java:1089)

        at

org.apache.catalina.core.StandardService.start(StandardService.java:459)

        at

org.apache.catalina.core.StandardServer.start(StandardServer.java:709)

        at org.apache.catalina.startup.Catalina.start(Catalina.java:551)

        ... 6 more



And tomcat hangs and does not respond to http requests.





I am checking vmstat at this time and see 3GB free memory.



I would appreciate any help.



Thanks,

Rahul Tandon



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