[MPICH] MPICH2 1.05 MPI_Send & MPI_Recv dropping packages randomly

[chong tan]

OS : RedHat Enterprise 4, 2.6.9-42.ELsmp
CPU   4 dual core Intel

the package was built with :
setenv CFLAGS "-m32 -O2"
setenv CC         gcc
./configure -prefix=/u/cgtan/my_release_dir --with-device=ch3:ssm --enable-fast |& tee configure.log

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the test programs run 5 processes, one master and 4 slaves.  Master always recv from slaves and them send to all of them.  Randomly, an MPI_Send performed in the master will complete, but the corresponidng MPI_Recv in the targeted slave would not complete, and the who thing hangs.  

I have a debugging mechanism that attachs a sequence id to all packages sent.  The packages are dumped before and after sent, and recv.  a message is also dumped on the the pending recv.  The sequence id traced OK all the way to the lost package.

The same code work fine with 2.1.04p1.  it has been tested on test cases longer than 100 million send/recv sequences.  any suggestions ?

tan


 
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