the limit could come from the JVM. iirc, you have to add extra flags to the java command line so the JVM can allocate more memory. java -Xmx=... or something like that (and that could be JVM dependent)
Cheers, Gilles On Thursday, January 21, 2016, Saliya Ekanayake <esal...@gmail.com> wrote: > Hi Ibrahim, > > This is most likely due to a ulimit setting. Check with *ulimit -a* and > set *ulimit -n unlimited* and *ulimit -l unlimited*. > > I've experienced the same problem in the past and this was the reason. > > Hope this helps > > On Wed, Jan 20, 2016 at 9:49 AM, Ibrahim Ikhlawi <ibrahim_...@hotmail.com > <javascript:_e(%7B%7D,'cvml','ibrahim_...@hotmail.com');>> wrote: > >> >> >> Hi Howard, >> >> I use 64bit JVM. The problem is not in the code, because I am still >> getting the same error when I run the Hello.java from examples folder. >> Any other suggestion? >> >> Ibrahim >> >> ------------------------------ >> Date: Tue, 19 Jan 2016 09:48:24 -0700 >> From: hpprit...@gmail.com >> <javascript:_e(%7B%7D,'cvml','hpprit...@gmail.com');> >> To: us...@open-mpi.org >> <javascript:_e(%7B%7D,'cvml','us...@open-mpi.org');> >> Subject: Re: [OMPI users] How to allocate more memory to java OpenMPI >> >> >> HI Ibrahim, >> >> Are you using a 32bit or 64bit JVM? >> >> I don't think this is an Open MPI issue, but likely something owing to >> your app or your java setup. >> You may want to checkout >> >> >> http://javaeesupportpatterns.blogspot.com/2012/09/outofmemoryerror-unable-to-create-new.html >> >> If you'd like to post the java code to the list, I can try it out on some >> of the servers I use. >> >> Howard >> >> >> 2016-01-19 8:03 GMT-07:00 Ibrahim Ikhlawi <ibrahim_...@hotmail.com >> <javascript:_e(%7B%7D,'cvml','ibrahim_...@hotmail.com');>>: >> >> >> Hallo, >> >> I'm working with java OpenMPI on a server with 64GB memory. But when I >> run the java class I can only run it on until 15 processes (with this >> command: mpirun -np 15 java Multiplikation). Although there is 64GB memory, >> only about 3 GB will be used(with top command can I see that, the first two >> lines are below). When I run more than 15 processes I get this error: >> >> Error occurred during initialization of VM >> java.lang.OutOfMemoryError: unable to create new native thread >> >> >> But I want to run it on more than 15 processes and use more than 3 GB. In >> Addition, after searching in google I have tried to run it with this >> command: >> >> mpirun -np 20 java -Xmx2096M -Xms1048M Multiplikation >> >> but I still get the same error. >> >> My question: How can I allocate java more memory, so that I run my >> program with more than 15 processes and more than 3GB memory? >> >> thanks in advance >> Ibrahim >> >> PS: >> It may help, these are the first two lines from the top command: >> >> PID PRI VIRT RES SHR S CPU% MEM% >> 23255 20 0 20.7G 103M 11916 S 2.0 0.2 0:52.14 java >> 23559 20 0 20.7G 33772 11916 S 1.0 0.1 0:50.82 java >> >> >> >> >> >> >> >> >> >> >> >> >> >> _______________________________________________ >> users mailing list >> us...@open-mpi.org <javascript:_e(%7B%7D,'cvml','us...@open-mpi.org');> >> Subscription: http://www.open-mpi.org/mailman/listinfo.cgi/users >> Link to this post: >> http://www.open-mpi.org/community/lists/users/2016/01/28301.php >> >> >> >> _______________________________________________ users mailing list >> us...@open-mpi.org <javascript:_e(%7B%7D,'cvml','us...@open-mpi.org');> >> Subscription: http://www.open-mpi.org/mailman/listinfo.cgi/users Link to >> this post: >> http://www.open-mpi.org/community/lists/users/2016/01/28302.php >> >> _______________________________________________ >> users mailing list >> us...@open-mpi.org <javascript:_e(%7B%7D,'cvml','us...@open-mpi.org');> >> Subscription: http://www.open-mpi.org/mailman/listinfo.cgi/users >> Link to this post: >> http://www.open-mpi.org/community/lists/users/2016/01/28308.php >> > > > > -- > Saliya Ekanayake > Ph.D. Candidate | Research Assistant > School of Informatics and Computing | Digital Science Center > Indiana University, Bloomington > Cell 812-391-4914 > http://saliya.org >
