[PJUG Javamail] Optimizing Java

Tue Sep 29 14:14:52 EDT 2009

Vincent,
Unfortunately nobody has wanted to pay me to 
optimize our software recently, so I haven't had 
much chance to work with a profiler in the last 
few years.  I used JProfiler a number of years 
ago and it did what I needed at the time.  JBoss 
has some built-in profiling that is using JMX 
data, but I haven't had a chance to play with it 
much so I can't say how useful it is.  Perhaps 
someone who has had a chance to do profiling 
recently can give some suggestions.  What 
specifically are you trying to profile (e.g. JEE 
app on JBoss 4.2, stand-alone client/server apps, a WAR on Tomcat...)?
Good luck!
--Zack

At 11:02 AM 9/29/2009, VY wrote:
>Zack:  Thanks for your reply.
>
>What is a good and widely used Java profiler?
>I saw those MxBeans classes in Java 1.5 and 1.6 
>and was thinking of using them.
>So wondering if those are the profiling you are referring to.
>
>
>
>
>On Tue, Sep 29, 2009 at 10:56 AM, Zack Radick 
><<mailto:zack at crc-corp.com>zack at crc-corp.com> wrote:
>Vincent,
>The modern JVM is highly tuned and many of the 
>old ways of ensuring JVM optimization do not 
>matter so much at this point (e.g. declaring 
>your variables as final inside of a loop as 
>opposed to declaring them outside is moot 
>because the JVM will do the right 
>thing).  However, there is still value to good 
>coding and if you have inefficiencies in your 
>algorithms it may make sense to spend some time 
>cleaning them up (especially if someone actually 
>wants to pay you to do so).  A good profiler can 
>help you determine where in your application you 
>are spending the most time and can potentially 
>point you in the right direction.  I'm afraid I 
>can't recommend anything specific as it depends 
>on your environment, but I would encourage you 
>to look into where your trouble spots are before 
>you start investigating optimization to make the best use of your time.
>--Zack
>
>
>At 10:41 AM 9/29/2009, VY wrote:
>>Thanks for the tips.
>>However, this raised a question that I have had before I email the group.
>>
>>This link is 4 years old:
>><http://java.sun.com/performance/reference/whitepapers/tuning.html>http://java.sun.com/performance/reference/whitepapers/tuning.html
>>
>>This book was published 9 years ago:
>><http://www.amazon.com/exec/obidos/ASIN/0201704293/none0b69>http://www.amazon.com/exec/obidos/ASIN/0201704293/none0b69
>>
>>
>>If I am using the latest JDK, are these resources still applicable?
>>I did some search myself and I ran into a lot of these somewhat dated
>>resources as well.
>>
>>It leaves me the impression that perhaps modern day Java VM is already
>>VERY optimized as is.
>>
>>--Vincent
>>
>>
>>
>>
>>On Tue, Sep 29, 2009 at 10:20 AM, Umesh Gohil 
>><<mailto:gohilumesh at hotmail.com>gohilumesh at hotmail.com > wrote:
>>May be this might help you
>>
>><http://java.sun.com/performance/reference/whitepapers/tuning.html>http://java.sun.com/performance/reference/whitepapers/tuning.html
>>
>>
>>----------
>>Date: Tue, 29 Sep 2009 10:09:01 -0700
>>From: <mailto:richardj at lingosys.com>richardj at lingosys.com
>>To: <mailto:javamail at pjug.org>javamail at pjug.org
>>Subject: Re: [PJUG Javamail] Optimizing Java
>>
>>
>>Vincent asks:
>>
>>" I have the need to optimize a server side Java application.  Is
>>" there any good book, website or reference   that talks about
>>" Java optimization?
>>
>>
>>Maybe these things from a quick search will get you started:
>>
>><http://bdn.backbase.com/node/5253>http://bdn.backbase.com/node/5253
>>http://www.amazon.com/exec/obidos/ASIN/0201704293/none0b69
>><http://software.intel.com/en-us/articles/optimizing-java-on-intel-server-platforms/>http://software.intel.com/en-us/articles/optimizing-java-on-intel-server-platforms/ 
>>
>>http://www.borland.com/us/products/index.html
>><http://www.excelsior-usa.com/jetserver.html>http://www.excelsior-usa.com/jetserver.html 
>>
>>
>>I think there's a local company that does 
>>optimization (and obfuscation) tools but who 
>>they are escapes me at the moment.  Good 
>>luck.  Let us know what you come up with, maybe do a talk for a meeting.  :-)
>>--
>>Richard J.
>>----------
>>Insert movie times and more without leaving 
>>Hotmail®. 
>><http://windowslive.com/Tutorial/Hotmail/QuickAdd?ocid=TXT_TAGLM_WL_HM_Tutorial_QuickAdd_062009>See 
>>how.
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