[concurrency-interest] [CPU Affinity] ThreadPoolExecutor to improve"O.S Scheduler" ?

David M. Lloyd david.lloyd at redhat.com
Fri Nov 20 14:45:05 EST 2009


He's saying it's probably a config issue with your OS, not a Java problem.

- DML

On 11/20/2009 01:35 PM, Safe P. wrote:
> David, thank you for your answer.
>
> The problem is exactly this:
>
> when I run java -cp . MyProcess & java -cp .MyProcess & ... in a 12-core
> machine that runs HP-UX, all processes are assign to one processor.
>
> That means that an instance must wait until the end of the previous
> instance to start. I want to run all instances in parallel, using all 12
> processors. Is this possibly? Maybe using ThreadPoolExecutor to execute
> each instance of this "java -cp .."?
>
> Thank you very much in advance!
>
>
> --- El *jue 19-nov-09, David Holmes /<davidcholmes at aapt.net.au>/* escribió:
>
>
>     De: David Holmes <davidcholmes at aapt.net.au>
>     Asunto: RE: [concurrency-interest] [CPU Affinity] ThreadPoolExecutor
>     to improve"O.S Scheduler" ?
>     Para: "Safe P." <z8sbk at yahoo.com.ar>, concurrency-interest at cs.oswego.edu
>     Fecha: jueves, 19 de noviembre de 2009, 9:45 pm
>
>     Matias,
>     I'm not really understanding your problem/issue, but most systems
>     have some notion of processing domains that let you allocate
>     resources (memory and CPU) to a domain and then run specific
>     processes in specific domains. On Solaris this is done with
>     processor sets, while on Linux there are CPU-sets. I don't know what
>     HP-UX has.
>     There are no Java API's to control thread or process affinity (other
>     than by exec'ing OS utilities to do it, or calling your own native
>     code routines.
>     Normally, absent any domains, all processes (and all their threads)
>     can run on any available processor/core.
>     HTH.
>     David Holmes
>
>         -----Original Message-----
>         *From:* concurrency-interest-bounces at cs.oswego.edu
>         [mailto:concurrency-interest-bounces at cs.oswego.edu]*On Behalf Of
>         *Safe P.
>         *Sent:* Friday, 20 November 2009 9:35 AM
>         *To:* concurrency-interest at cs.oswego.edu
>         *Subject:* [concurrency-interest] [CPU Affinity]
>         ThreadPoolExecutor to improve"O.S Scheduler" ?
>
>         Hi,
>         I'm very new to concurrent programming and I couldn't find
>         anywhere if this is an issue or just a limitation.
>         I'm running several instances of a java process like "process.sh
>         & process.sh & process.sh ..." in an HP-UX that runs over a
>         12-core machine.
>
>         When I use sar, top, and other utilities I can see that HP-UX is
>         using just 1 core. It doesn't manage to assign one processor per
>         process.
>         Can I get this using ThreadPoolExecutor (like one
>         System.Runtime.exec() per thread)?
>         Unfortunately, this machine is a production server so I can't
>         get access to it in order to do some test and verify that, and
>         of course, if this make a significant time improvement.
>
>         Thank you very much in advanced.
>         --Matias
>
>
>         ------------------------------------------------------------------------
>
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>
>
> ------------------------------------------------------------------------
>
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>
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