Server (memory/storage occupied at runtime) maintenance, and performance

["Angeles Jesus Jr. Calimlim" <jc...@hotmail.com>]

Hi Tomcat users,

I run a website using Tomcat 6.

i was wondering if there are things i should do e.g.:
- to free up some hdisk space occupied by Tomcat
- or free up some memory occupied by Tomcat
- or anything that can improve its performance

I use it for my production website, but have no sufficient knowledge on maintaining (or improving performance) it in production.

Re: Server (memory/storage occupied at runtime) maintenance, and performance

[Edson Richter <ed...@hotmail.com>]

Em 16/02/2013 03:15, Angeles Jesus Jr. Calimlim escreveu:
> Hi Tomcat users,
>
> I run a website using Tomcat 6.
>
> i was wondering if there are things i should do e.g.:
> - to free up some hdisk space occupied by Tomcat
> - or free up some memory occupied by Tomcat
> - or anything that can improve its performance
>
> I use it for my production website, but have no sufficient knowledge on maintaining (or improving performance) it in production.
>
>
Do you have any goal or is just throwing up disparate ideas?

This is a long answer just because I can't understand what you want to know.

I can't answer your points above, but I can tell what **I** have as 
minimum server:

1) Hardware: Cloud server, 1GB RAM, 40GB HD, 1 core x 1Ghz.
2) Software:
2.1) How much disk space for a minimal Tomcat application: 8,5 MB
2.2) How much disk space for 5 web apps: 369Mb (including libraries)
2.3) Temporary space (work and temp folders): 16,5Mb
2.4) Space for logs (more than a year of collected logs): 10Mb
3) How many users served by this server: 50
4) Other software in same server: PostgreSQL 9.2 database, using 5,3Gb 
for data and regular backups

As server has 1Gb of RAM, I have setup swap - but never used it. Tomcat 
7.0.35 behaves correctly, latest JDK 7 Virtual Machine with some 
tunning, and I was able to balance memory between Tomcat and PostgreSQL. 
I've set maximum of 768Mb for Tomcat, and 256 Mb for PostgreSQL. Result is:



Looking VisualVM statistics of this production server in a typical day 
of work, I get the following:



So, as you can see, Java applications are not that "huge memory eater" 
as normally people advertise.


My startup parameters follow (they don't guarantee success, but they are 
working for me):

-XX:+UseParNewGC -XX:+UseConcMarkSweepGC -Xmx768m -XX:NewSize=160m 
-XX:MaxNewSize=200m -XX:PermSize=96m -XX:MaxPermSize=200m


**Test everything before putting this in production**. Just because it 
works for me, doesn't guarantee it will work for you (or your applications).

After all, BE CAREFUL.

I've complete control of how my apps are being developed, and I'm very 
careful with resources release - most of problems in Java applications 
are related to not releasing resources in appropriate way (I mean, 
files, JDBC connections, transactions, network connections, temporary 
files, session content, patterns like utility or builder, caches, 
threads, etc).

Kind regards,

Edson Richter

Re: Server (memory/storage occupied at runtime) maintenance, and performance

[Darryl Lewis <da...@unsw.edu.au>]

Do you have a problem, or you just want to learn 'best practice'?
I would suggest you gather some performance statistics to start with, as
each application is different.
I lie to use a tool called Melody to gather running stats (maybe some
others on the list can suggest others) as I found it easy to install, and
it gave me the basics of what I needed.
Something like this will give you a baseline envelope that you can use to
see how well it is performing.



On 16/02/13 8:19 PM, "André Warnier" <aw...@ice-sa.com> wrote:

>Angeles Jesus Jr. Calimlim wrote:
>> Hi Tomcat users,
>> 
>> I run a website using Tomcat 6.
>> 
>> i was wondering if there are things i should do e.g.:
>> - to free up some hdisk space occupied by Tomcat
>> - or free up some memory occupied by Tomcat
>> - or anything that can improve its performance
>> 
>> I use it for my production website, but have no sufficient knowledge on
>>maintaining (or improving performance) it in production.
>> 
>
>Do you really think that anyone can answer this, and in how many pages
>would you like it ?
>Does your production application display "Hello World", or does it
>calculate the GDP of
>the OECD countries over the last 20 years ?
>Read the Tomcat on-line documentation, buy a book, understand how it
>works, figure out 
>what the problem is (if there is a problem), and then if you have a real
>problem, come 
>back here and ask a specific question.
>
>
>
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Re: Server (memory/storage occupied at runtime) maintenance, and performance

[André Warnier <aw...@ice-sa.com>]

Angeles Jesus Jr. Calimlim wrote:
> Hi Tomcat users,
> 
> I run a website using Tomcat 6.
> 
> i was wondering if there are things i should do e.g.:
> - to free up some hdisk space occupied by Tomcat
> - or free up some memory occupied by Tomcat
> - or anything that can improve its performance
> 
> I use it for my production website, but have no sufficient knowledge on maintaining (or improving performance) it in production.
> 

Do you really think that anyone can answer this, and in how many pages would you like it ?
Does your production application display "Hello World", or does it calculate the GDP of 
the OECD countries over the last 20 years ?
Read the Tomcat on-line documentation, buy a book, understand how it works, figure out 
what the problem is (if there is a problem), and then if you have a real problem, come 
back here and ask a specific question.



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