Thanks for you comments. >> 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)
Ok, but I meant to say about JVM, because my requirement is to leverage such nodes as have no JVM supported, for example, Gentoo Linux/SPARC64 as workers. I thought that the Java binding implementation wraps Open MPI only on the rank zero side. This is because the FAQ says: > 8. Do the Java bindings impact performance of my non-Java application? > The Java bindings in Open MPI are completely transparent to all other Open > MPI users and have zero performance impact on the rest of the code/bindings. But I realize that this perhaps mentions about the Open MPI applications that use a Java-enabled Open MPI build. Meantime, the next FAQ is specifying the possibility of performance penalties for Java applications that use Open MPI. Regards, --yoshiki
