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Re: Tools/frameworks for Java multi-core programming?

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  To: Robert Klemme
From: Lew <lewbloch@gmail.com>

Robert Klemme wrote:
> anthonycwmak wrote:
>> I am trying to find tools/frameworks that help with writing Java
>> program that can utilize multi-core CPU. So far I only found

Java programs can "utilize" multi-core CPUs out of the box. You need do nothing 
special.

>> jconcurr, JOMP, JAMP, Ateji, but they all either requires special
>> shell command to compile and run the programs, or, in Ateji's case
>> use a special file extension which is converted to java file. This
>> doesn't seem to be ideal if I require to build multi-core programs
>> that can be built on Maven or similar,

> Why is that an issue?  Typically you can include custom build procedures
> in a build tool / framework.

>> and requires them to run on an
>> enterprise environment or application server.

> If you are on an JEE application server that will usually take care of
> the concurrency.  You typically need to use those APIs the JEE spec or
> AS at hand provides to not interfere with the framework in bad ways
> (e.g. by breaking transactions).  That does not seem like a bad option
> although AS come with their own learning curve.

>> Besides writing concurrent programs, by using Java Concurrency API
>> directly, to utilize the multi-core, are there other easier/simpler
>> way to create Java enterprise applications that utlize multi-core
>> CPUs? Preferably, just annotate my POJOs to make them multi-core
>> capable?

> "Making a POJO multi-core capable" is meaningless.  Using concurrency is
> more like an architectural property of your application (even though you
> need to take care to use POJOs properly - but it's not enough to make
> POJOs thread safe).  At this point I am suspecting that someone told you
> modern Java programs must use multiple cores and you want to get it done
> easily.  Unfortunately that won't work: you need to understand the
> particular issues associated with concurrency to properly craft such
> applications - even if you use a framework that takes away a large part
> of the work from you.

As Robert said, if you're writing enterprise apps using Java EE, then the 
threading is already done. You should pretty much never explicitly code a Java 
EE component to spawn a thread.

Java SE is another matter. You do have to use thread calls to spawn threads. 
Once you have at least two threads in a program (and all Java programs do), 
then you are multi-core capable.

Java programs that use threads are already multi-core capable.

Boom, done.

What are you really after?

--
Lew

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Tools/frameworks for Java multi-core programming? "anthonycwmak" <anthonycwmak@1:261/38.remove-fcj-this> - 2012-08-14 19:59 +0000
  Re: Tools/frameworks for Java multi-core programming? "mr amitghuge1" <mr.amitghuge1@1:261/38.remove-fcj-this> - 2012-08-14 19:59 +0000
    Re: Tools/frameworks for Java multi-core programming? "Arne Vajhøj" <arne.vajhøj@1:261/38.remove-fzq-this> - 2012-08-20 18:58 +0000
      Re: Tools/frameworks for Java multi-core programming? "anthonycwmak" <anthonycwmak@1:261/38.remove-fzq-this> - 2012-08-20 18:58 +0000
        Re: Tools/frameworks for Java multi-core programming? "Lew" <lew@1:261/38.remove-fzq-this> - 2012-08-20 18:58 +0000
  Re: Tools/frameworks for Java multi-core programming? "Robert Klemme" <robert.klemme@1:261/38.remove-z1z-this> - 2012-08-15 18:36 +0000
    Re: Tools/frameworks for Java multi-core programming? "Lew" <lew@1:261/38.remove-z1z-this> - 2012-08-15 18:36 +0000
    Re: Tools/frameworks for Java multi-core programming? "anthonycwmak" <anthonycwmak@1:261/38.remove-s96-this> - 2012-08-16 19:16 +0000
      Re: Tools/frameworks for Java multi-core programming? "markspace" <markspace@1:261/38.remove-s96-this> - 2012-08-16 19:16 +0000
      Re: Tools/frameworks for Java multi-core programming? "Arne Vajhøj" <arne.vajhøj@1:261/38.remove-fzq-this> - 2012-08-20 18:58 +0000

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