Dear All:

I need to transfer some messages from workers master node on MPI cluster with Open MPI.

I use boost MPI API in my program. 

The number of messages is fixed. 

When I increase the number of worker nodes, i got error: 

------------------------------------------

terminate called after throwing an instance of 'boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::mpi::exception> >'

  what():  MPI_Unpack: MPI_ERR_TRUNCATE: message truncated

[n231:45873] *** Process received signal ***

[n231:45873] Signal: Aborted (6)

[n231:45873] Signal code:  (-6)

[n231:45873] [ 0] /lib64/libpthread.so.0 [0x3c50e0e4c0]

[n231:45873] [ 1] /lib64/libc.so.6(gsignal+0x35) [0x3c50230215]

[n231:45873] [ 2] /lib64/libc.so.6(abort+0x110) [0x3c50231cc0]

--------------------------------------------------------------

For 40 workers , it works well. 

But for 50 workers, it got this error. 

The largest message size is not more then 72 bytes. 

Any help is appreciated. 

thanks

Jack

July 7 2010