MPJ-Express error mpjdev.MPJDevException: In Comm.irecv(), requested source 1 does not exist in communicator of size 1 - spn

Question

I'm trying to run some Sum Product Network code found at http://alchemy.cs.washington.edu/spn/
When I try to run this on my mac (ver 10.8.4) , I run into the following error:
mpjrun.sh -np 1 eval.Run -d O
MPJ Express (0.40) is started in the multicore configuration
[Rank=0] *** Parameters ***
[Rank=0] domain=O
[Rank=0] numSumPerRegion=20
[Rank=0] numComponentsPerVar=4
[Rank=0] sparsePrior=1.0
[Rank=0] baseResolution=4
[Rank=0] numSlavePerClass=50
[Rank=0] numSlaveGrp=1
[Rank=0] <TIME> init 1687 ms
mpjdev.MPJDevException: In Comm.irecv(), requested source 1 does not exist in
communicator of size 1
at mpjdev.Comm.recv(Comm.java:864)
at mpi.Comm.recv(Comm.java:1294)
at mpi.Comm.Recv(Comm.java:1255)
at spn.SPN.recvUpdate(SPN.java:650)
at spn.GenerativeLearning.learnHardEM(GenerativeLearning.java:52)
at spn.GenerativeLearning.learn(GenerativeLearning.java:16)
at eval.Run.runOlivetti(Run.java:147)
at eval.Run.proc(Run.java:46)
at eval.Run.main(Run.java:40)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at runtime.starter.MulticoreStarter$1.run(MulticoreStarter.java:277)
at java.lang.Thread.run(Thread.java:744)
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at runtime.starter.MulticoreStarter$1.run(MulticoreStarter.java:277)
at java.lang.Thread.run(Thread.java:744)
Caused by: mpi.MPIException: mpi.MPIException: mpjdev.MPJDevException: In Comm.irecv(), requested source 1 does not exist in communicator of size 1
at mpi.Comm.Recv(Comm.java:1259)
at spn.SPN.recvUpdate(SPN.java:650)
at spn.GenerativeLearning.learnHardEM(GenerativeLearning.java:52)
at spn.GenerativeLearning.learn(GenerativeLearning.java:16)
at eval.Run.runOlivetti(Run.java:147)
at eval.Run.proc(Run.java:46)
at eval.Run.main(Run.java:40)
... 6 more
Caused by: mpi.MPIException: mpjdev.MPJDevException: In Comm.irecv(), requested source 1 does not exist in communicator of size 1
at mpi.Comm.recv(Comm.java:1317)
at mpi.Comm.Recv(Comm.java:1255)
... 12 more
Caused by: mpjdev.MPJDevException: In Comm.irecv(), requested source 1 does not exist in communicator of size 1
at mpjdev.Comm.recv(Comm.java:864)
at mpi.Comm.recv(Comm.java:1294)
... 13 more
This happens for any value of np I give. I'm assuming this is not an issue with the SPN code but rather something I am doing with MPJ-Express. I have tried both version 0.40 and 0.37 for MPJ-Express and get the same result.
Thanks for your time.

Answer 1

I have the same problem when I run the code and found the answer in the SPN user guide.
The command to run SPN is:
mpjrun.sh -np [NUM_PROCESSOR] -dev niodev -mx8000m eval.Run [SPN OPTIONS] > [LOG FILE]
where NUM_PROCESSOR depends on the number of slave processes for each image category, and the number of slave groups. It should equal to (numSlavePerCat + 1) × numSlaveGroup, numSlavePerCat and numSlaveGroup can be found in common/Parameter.java. If you want to run in your machine which do not have so much processors, you can modify the numSlavePerCat.