[PJUG Javamail] Optimizing Java

[Gera Shegalov]

I would also suggest Oracle Jdeveloper
http://www.oracle.com/technology/products/jdev/index.html. It is a
free IDE that comes with a CPU Profiler (cpu time, elapsed time,
blocked and wait time, io wait time, etc), and a Memory profiler (you
can attack components that overwhelm GC by creating too many objects
and memory leaks). Jdeveloper proved itself useful during my
"performance weeks".

Thanks,

Gera


On Tue, Sep 29, 2009 at 11:14 AM, Zack Radick <zack at crc-corp.com> wrote:
> 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 <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
>
> This book was published 9 years ago:
> 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 <gohilumesh at hotmail.com >
> wrote: May be this might help you
>
> http://java.sun.com/performance/reference/whitepapers/tuning.html
>
> ________________________________
> Date: Tue, 29 Sep 2009 10:09:01 -0700 From: richardj at lingosys.com To:
> 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://www.amazon.com/exec/obidos/ASIN/0201704293/none0b69
> 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   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®. See how.
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