Victor, (I missed the first part of today's meeting, and only heard the later part of your intro to the condor-jdrmaa project. May be you mentioned something that I am missing here) The condor-jdrmaa SF page says "future versions will reduce the amount of JNI used, so that eventually, a pure Java..." IMO, it is hard to implement a pure Java DRMAA library, as the only way to talk to the Central Manager in Condor, or pbs_server in PBS/PBSPro/Torque, or mbatchd in LSF is via a TCP/IP socket connection, yet each DRM has its own protocol. It's a bit better on the SGE side, as it has JGDI (Java Grid engine Database Interface) and JMX, but it requires running a JVM in the qmaster, and it's not really for DRMAA yet: http://gridengine.sunsource.net/download/workshop10-12_09_07/SGE-WS2007-Futu... And my question is, what's the benefit of getting a pure Java implementation, and what are the problems that cannot be fixed in the current implementation of using Java wrappers+JNI+C DRMAA? Writing new Java code to talk to the master machine from scratch is a big effort, and doing that for each DRM may introduce compatibility issues -- SGE developers mentioned before that GDI compatibility is not guaranteed across versions. FYI, in 2006 the XGrid DRMAA Summer of Code project uses the Java wrappers+JNI+C DRMAA, and there were a number of things that Ed did to get it to work: http://code.edbaskerville.com/2006/07/11/java-bindings-working/ And you can see the background info here: http://www.ogf.org/pipermail/drmaa-wg/2006-June/000470.html Rayson On 9/2/08, Felix, Victor <vfelix@som.umaryland.edu> wrote:
Hello,
Just wanted to point out that a new project has been set up on SourceForge to provide a Java DRMAA implementation for Condor, which has been missing. It is called Condor-JDRMAA. The current release is simply a wrapper around the C implementation, however future releases will work toward a pure Java implementation...
http://sourceforge.net/projects/condor-jdrmaa/
Best regards,
-Victor
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