On Oct 23, 2012, at 9:51 PM, Yoshiki SATO <yosh...@ci.i.u-tokyo.ac.jp> wrote:
> Hi, > > Recently, I tried to use Java bindings in Open MPI released this February. > As far as mentioned in the Java FAQ ( > http://www.open-mpi.org/faq/?category=java ), the Java binding implementation > doesn't cause any performance degradation because of just wrapping native > Open MPI with mpiJava-based APIs. I believe this means no Java code is > required to run on all processing nodes (workers) but it has only to run on a > master node. Is this understanding correct? Not sure I fully understand, but I believe the answer is no - Java code is going to run on all nodes where there are processes. > > If so, my question is if I need NOT to install JDK to the all nodes. In > other words is it possible to have a machine used as a worker without JDK > installed? > You do not need JDK installed on worker nodes - it only has to be on the node where you compile your code. However, we launch a JVM for each process, so you must at least have the JVM installed on each worker. This is typically included in a base Linux installation (just look for the "java" command, usually in /usr/bin), so you usually don't have to do anything special (as opposed to installing the JDK, which doesn't usually come in the base install) HTH Ralph > Thanks a lot for any comment in advance. > > Regards, > --yoshiki > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users
