[PJUG Javamail] Optimizing Java

[VY]

sending response to the group.


On Tue, Sep 29, 2009 at 10:47 AM, Joe Sam Shirah <joe_sam at bellsouth.net>wrote:

>
>   Hi Vincent,
>
>   This site is probably foremost in Java performance, although not always
> dealing with web sites:
>
> http://www.javaperformancetuning.com/
>
>
>   This one has lots of information on many aspects of Java, and the
> newsletter is well respected:
>
> http://www.javaspecialists.eu/
>
>
>   Having pointed those out, they may be less than helpful if you don't have
> ideas about *where* the bottleneck(s) exist.  I can say that, short of run
> amuck loops and absolutely crazy code - which does exist - the typical areas
> where you can actually expect an order of magnitude increase in performance
> are:
>
>   memory management - IF you have memory problems.
>
>   I/O
>
>   Database
>
>   Sooooooometimes, the network itself.
>
>   While I know all about "premature optimization," my experience over a
> long time, with different systems and different languages, is that
> performance normally results from lots of little efficiencies rather than
> one big "Aha!" moment.  There are, of course, always exceptions, like
> repeatedly loading classes that do heavy lifting in constructors.
>
>   I'm at the tail end of a seriously warped project that, among other
> things, had a production system running half on an AS/400 DB2 database and
> half on SQL Server.  There have been *lots* of tricks I had to do there,
> mostly to avoid distributed joins.
>
>   This advice is guaranteed to be worth at least what you paid for it.
>
>   HTH,
>
>
>                                                        Joe Sam
>
> Joe Sam Shirah -        http://www.conceptgo.com
> conceptGO       -        Consulting/Development/Outsourcing
> Java Filter Forum:       http://www.ibm.com/developerworks/java/
> Just the JDBC FAQs: http://www.jguru.com/faq/JDBC
> Going International?    http://www.jguru.com/faq/I18N
> Que Java400?            http://www.jguru.com/faq/Java400
>
> ----- Original Message ----- From: "VY" <vyau5678 at gmail.com>
> To: <javamail at pjug.org>
> Sent: Tuesday, September 29, 2009 12:50 PM
> Subject: [PJUG Javamail] Optimizing Java
>
>
>
>  Hi:
>>
>> I have the need to optimize a server side Java application.  Is there any
>> good book, website or reference
>> that talks about Java optimization?
>>
>> thanks
>>
>> --Vincent
>>
>>
>
>
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>
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