Re: Tomcat server Performance imporvement required
Paul, Subhro wrote:
-Original Message-
From: Konstantin Kolinko [mailto:knst.koli...@gmail.com]
Sent: Sunday, March 29, 2015 5:59 PM
To: Tomcat Users List
Subject: Re: Tomcat server Performance imporvement required
Email sent from outside of PSEG. Use caution before using links/attachments.
2015-03-29 9:52 GMT+03:00 Paul, Subhro subhro.p...@pseg.com:
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
Memory options should go into CATALINA_OPTS only, not both.
If you are using a 64-bit JVM, it needs more memory than a 32-bit JVM
would need, as object pointers require more memory.
...
Best regards,
Konstantin Kolinko
-
To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org
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Dear Team,
Thanks for your replies.
We are going to increase the heap size of CATALINA to 4GB like
CATALINA_OPTS=${CATALINA_OPTS} -Xms4096M -Xmx4096M.
Is it required to increase the maxThread count also as we are increasing the
heap size? As of now the this parameter is as below:
maxThreads=512
The size of the heap and the number of threads available to process transactions may have
a relationship with eachother, but it is indirect, and you do not have to modify them in
parallel.
In other words :
- the maxThreads parameter specifies how many independent threads (think agents) Tomcat
may start and have running at the same time, each one of them usually processing one HTTP
request from one client. It should be commensurate thus to how many HTTP requests you
expect your server to have to service simultaneously at any given moment in time.
Which itself is a factor of :
- how many new requests your server is expected to receive over a given period
of time
- and how long each request takes on average to be serviced by your server
Suppose that you expect 1000 new requests to arrive within 1 second.
And suppose that it takes on average 0.5 s to service one request.
Then you would need approximately 500 threads to do the job.
(Because the 1st request would be allocated to the first thread, etc. And after 0.5 s, the
first thread would be free again, so it could handle the 501st request and so on).
Conversely, if it took on average 2 s to process one request, then you would need 2000
threads to handle the load (because after 1 s, 1000 threads would be busy for at least
another second, but 1000 new requests will arrive during that next second.)
- each of these threads will use some capacity in the Heap. So if you have 1000 possible
threads active at some moment, it is likely that this will use up more Heap capacity than
if you had only 500.
And finally, memory is not the only thing which each thread is using; it also uses CPU
time, and there is always a limit somewhere, depending on the total resources of your system.
As mentioned before, the only way to actually find out what is optimal for your system, is
to monitor what actually is happening during a normal workload.
If the size of the Heap is not comfortable enough for the number of threads running in
your application, the JVM will start performing more frequent Garbage Collections to free
space on the Heap more often. This in itself uses up some processing capacity and thus
slows down your server, which may have the result of increasing the number of threads
active, which may have the result of increasing the demand on memory in the Heap, etc..
A general remark : starting to play around with such parameters is a real waste of time,
if you do not at least have some real-world measurements to back up your changes.
There is no general rule, it all depends
Re: Tomcat server Performance imporvement required
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA256
Subhru,
On 3/30/15 7:40 AM, Paul, Subhro wrote:
-Original Message- From: Konstantin Kolinko
[mailto:knst.koli...@gmail.com] Sent: Sunday, March 29, 2015 5:59
PM To: Tomcat Users List Subject: Re: Tomcat server Performance
imporvement required
Email sent from outside of PSEG. Use caution before using
links/attachments.
2015-03-29 9:52 GMT+03:00 Paul, Subhro subhro.p...@pseg.com:
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=${CATALINA_OPTS} -Xms1024M -Xmx1024M
Memory options should go into CATALINA_OPTS only, not both.
If you are using a 64-bit JVM, it needs more memory than a 32-bit
JVM would need, as object pointers require more memory.
...
Best regards, Konstantin Kolinko
-
To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org
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Dear Team,
Thanks for your replies.
We are going to increase the heap size of CATALINA to 4GB like
CATALINA_OPTS=${CATALINA_OPTS} -Xms4096M -Xmx4096M.
I'm not sure expanding your heap is going to help. If you aren't
getting OutOfMemoryError, then heap memory isn't your problem.
Is it required to increase the maxThread count also as we are
increasing the heap size? As of now the this parameter is as
below:
maxThreads=512
If you increase maxThreads, you will need more memory just for thread
stacks.
Your maxThreads should be adjusted based upon the amount of traffic
you need to be able to handle. If 512 threads is able to handle your
current workload, I don't see any reason to increase it.
- -chris
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RE: Tomcat server Performance imporvement required
-Original Message-
From: Konstantin Kolinko [mailto:knst.koli...@gmail.com]
Sent: Sunday, March 29, 2015 5:59 PM
To: Tomcat Users List
Subject: Re: Tomcat server Performance imporvement required
Email sent from outside of PSEG. Use caution before using links/attachments.
2015-03-29 9:52 GMT+03:00 Paul, Subhro subhro.p...@pseg.com:
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
Memory options should go into CATALINA_OPTS only, not both.
If you are using a 64-bit JVM, it needs more memory than a 32-bit JVM
would need, as object pointers require more memory.
...
Best regards,
Konstantin Kolinko
-
To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org
For additional commands, e-mail: users-h...@tomcat.apache.org
Dear Team,
Thanks for your replies.
We are going to increase the heap size of CATALINA to 4GB like
CATALINA_OPTS=${CATALINA_OPTS} -Xms4096M -Xmx4096M.
Is it required to increase the maxThread count also as we are increasing the
heap size? As of now the this parameter is as below:
maxThreads=512
Regards,
Subhro Paul
-
The information contained in this e-mail, including any attachment(s), is
intended solely for use by the named addressee(s). If you are not the intended
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to the intended recipient, you are not authorized to disclose, copy, distribute
or retain this message, in whole or in part, without written authorization from
PSEG. This e-mail may contain proprietary, confidential or privileged
information. If you have received this message in error, please notify the
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PSEG. Thank you for your cooperation.
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Tomcat server Performance imporvement required
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= protocol=HTTP/1.1
connectionTimeout=2
server=
secure=true
redirectPort=
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'.
Is there any other parameters we can add in the servers to increase performance?
Thanks Regards,
Subhro Paul
-
The information contained in this e-mail, including any attachment(s), is
intended solely for use by the named addressee(s). If you are not the intended
recipient, or a person designated as responsible for delivering such messages
to the intended recipient, you are not authorized to disclose, copy, distribute
or retain this message, in whole or in part, without written authorization from
PSEG. This e-mail may contain proprietary, confidential or privileged
information. If you have received this message in error, please notify the
sender immediately. This notice is included in all e-mail messages leaving
PSEG. Thank you for your cooperation.
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RE: Tomcat server Performance imporvement required
Thanks Ameer for your reply.
What is the max value we can assign to heap space?
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= protocol=HTTP/1.1
connectionTimeout=2
server=
secure=true
redirectPort=
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
-
The information contained in this e-mail, including any attachment(s), is
intended solely for use by the named addressee(s). If you are not the
intended recipient, or a person designated as responsible for delivering
such messages to the intended recipient, you are not authorized to
disclose, copy, distribute or retain this message, in whole or in part,
without written authorization from PSEG. This e-mail may contain
proprietary, confidential or privileged information. If you have received
this message in error, please notify the sender immediately. This notice is
included in all e-mail messages leaving PSEG. Thank you for your
cooperation.
-
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For additional commands, e-mail: users-h...@tomcat.apache.org
Regards,
Ameer Mawia
-
The information contained in this e-mail, including any attachment(s), is
intended solely for use by the named addressee(s). If you are not the intended
recipient, or a person designated as responsible for delivering such messages
to the intended recipient, you are not authorized to disclose, copy, distribute
or retain this message, in whole or in part, without written authorization from
PSEG. This e-mail may contain proprietary, confidential or privileged
information. If you have received this message in error, please notify the
sender immediately. This notice is included in all e-mail messages leaving
PSEG. Thank you for your cooperation.
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Re: Tomcat server Performance imporvement required
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= protocol=HTTP/1.1
connectionTimeout=2
server=
secure=true
redirectPort=
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
-
The information contained in this e-mail, including any attachment(s), is
intended solely for use by the named addressee(s). If you are not the
intended recipient, or a person designated as responsible for delivering
such messages to the intended recipient, you are not authorized to
disclose, copy, distribute or retain this message, in whole or in part,
without written authorization from PSEG. This e-mail may contain
proprietary, confidential or privileged information. If you have received
this message in error, please notify the sender immediately. This notice is
included in all e-mail messages leaving PSEG. Thank you for your
cooperation.
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Regards,
Ameer Mawia
Re: Tomcat server Performance imporvement required
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= protocol=HTTP/1.1
connectionTimeout=2
server=
secure=true
redirectPort=
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
-
The information contained in this e-mail, including any attachment(s), is
intended solely for use by the named addressee(s). If you are not the
intended recipient, or a person designated as responsible for delivering
such messages to the intended recipient, you are not authorized to
disclose, copy, distribute or retain this message, in whole or in part,
without written authorization from PSEG. This e-mail may contain
proprietary, confidential or privileged information. If you have received
this message in error, please notify the sender immediately. This notice is
included in all e-mail messages leaving PSEG. Thank you for your
cooperation.
-
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For additional commands, e-mail: users-h...@tomcat.apache.org
Regards,
Ameer Mawia
-
The information contained in this e-mail, including any attachment(s), is
intended solely for use by the named addressee(s). If you are not the intended
recipient, or a person designated as responsible for delivering such messages
to the intended recipient, you are not authorized to disclose, copy, distribute
or retain this message, in whole or in part, without written authorization from
PSEG. This e-mail may contain proprietary, confidential
Re: Tomcat server Performance imporvement required
2015-03-29 9:52 GMT+03:00 Paul, Subhro subhro.p...@pseg.com:
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
Memory options should go into CATALINA_OPTS only, not both.
If you are using a 64-bit JVM, it needs more memory than a 32-bit JVM
would need, as object pointers require more memory.
...
Best regards,
Konstantin Kolinko
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