[zeromq-dev] Two apps on the same JVM

Min miniway at gmail.com
Sun May 26 14:11:45 CEST 2013


Hi,

In a benchmark, jeromq didn't have severe performance degration.
http://comments.gmane.org/gmane.network.zeromq.devel/18960

I would be happy if you test on both systems. You don't need to change your
application whichever you use.

Thanks
Min

2013년 5월 25일 토요일에 Erwin Karbasi님이 작성:

> Siam Rafiee <siamraf <at> gmail.com> writes:
>
> >
> >
> > What container are you using to bring up the applications? The JVM won't
> let you load the same native library from different classloaders. You'll
> need to ensure the library is loaded in a parent classloader, available to
> both application classloaders. For example, in Tomcat you would achieve
> this
> by placing the jzmq jar in 'tomcat/lib' and the native libraries in
> 'tomcat/bin'.
> >
> >
> > You might find it easier to swap out JZMQ for JeroMQ
> (https://github.com/zeromq/jeromq), which is a pure Java implementation
> with
> no need for native libraries.
> >
> > Siam
> >
> >
> > On 24 May 2013 12:51, Erwin Karbasi <erwin <at> optinity.com> wrote:
> >
> >
> >
> >
> > Hello Guys,
> > Following our use cases:
> >
> > 1. We have two applications that packaged the SO file (C lib files) and
> JZMQ.jar as part of the applications  jar.
> > We have tried to deploy these apps on the same JVM and encountered
> following error:
> >
> >
> > java.lang.UnsatisfiedLinkError:
> > jzmq (Not found in java.library.path)
> >
> > 2. We have also tried to set the lib files in the LD_LIBERARY_PATH
> (instead of above approach of packaging the lib as part of the application
> jar) and use separate Context object per application on the same JVM but we
> came across following error:
> >
> >
> >
> >
> >
> >
> > java.lang.UnsatisfiedLinkError:
> > jzmq (Library is already loaded in another ClassLoader)
> >
> >
> > at java.lang.ClassLoader.loadLibraryWithPath(ClassLoader.java:1053)
> >
> >
> > at
> java.lang.ClassLoader.loadLibraryWithClassLoader(ClassLoader.java:1017)
> >
> >
> > at java.lang.System.loadLibrary(System.java:474)
> >
> >
> > at org.zeromq.ZMQ.<clinit>(ZMQ.java:36)
> >
> >
> > Your insight regarding above two issues would highly appreciated.
> >
> > Thanks,
> > Erwin Karbasi
> >
> >
> > AT&T, Senior Software Architect
> >
> >
> > _______________________________________________
> > zeromq-dev mailing listzeromq-dev <at>
> lists.zeromq.orghttp://lists.zeromq.org/mailman/listinfo/zeromq-dev
> >
> >
> >
> >
> >
> >
> > _______________________________________________
> > zeromq-dev mailing list
> > zeromq-dev <at> lists.zeromq.org
> > http://lists.zeromq.org/mailman/listinfo/zeromq-dev
> >
>
>
> Hello Siam,
>
> Thanks a lot for fast turnaround response.
>
> I'm using WebSphere application server.
>
> 1. I know that if I'll add the library as a shared lib to the JVM I can use
> two Context object in the same JVM, but is it possible to add the
> LD_LIBERARY_PATH to the machine properties or using -Djava.lib.path as
> property of the JVM and to create two separate Context on separate app
> deployed on the same JVM?
>
> 2. I'd happy to use the JeroMQ, but as I know its performance is not a same
> as JZMQ and it could degrade the messaging performance significantly.
>
> Thanks,
> Erwin
>
> _______________________________________________
> zeromq-dev mailing list
> zeromq-dev at lists.zeromq.org <javascript:;>
> http://lists.zeromq.org/mailman/listinfo/zeromq-dev
>
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