[mpich-discuss] Dismatch in the data size field of ch3 packet header between sender and receiver

[Bowen Zhou]

Hi all,

Please forgive my ignorance if the following question is silly and
meaningless in your opinion. I would be very thankful if you could shed
a light on it.

I am running NASPar benchmark on MPICH2 with the ch3 message debugging
enabled. By adding up the data size of sent and received packets in the
log respectively, I found the total amount of data sent from all nodes
is greater than the total amount of data received by all nodes. IMHO,
either I have misconfiguration in enabling the ch3 debugging log or the
ch3 message debugging does not cover all received packets. And maybe
something else. I hope you MPICH gurus could give some hints.

My one-line command for running NASPar on MPICH2 as follows:
mpiexec -n $nprocs $app -mpich-dbg=file -mpich-dbg-class=ch3_msg

And my configure for the MPICH2 I used is as follows:
./configure --enable-sharedlibs=gcc --enable-g=log

And I am willing to provide other info upon request.

TIA,

Bowen