I found that ./openmpi-1.4.3/ompi/runtime/ompi_mpi_init.c was changed.
Calling opal_progress_event_users_decrement was deleted as below.
$diff openmpi-1.4.2/ompi/runtime/ompi_mpi_init.c openmpi-1.4.3
< /* Undo ORTE calling opal_progress_event_users_increment() during
< MPI lifetime, to get better latency when not using TCP. Do
< this *after* dyn_init, as dyn init uses lots of ORTE
< communication and we don't want to hinder the performance of
< that code. */
I confirmed that this change affects SYSTEM CPU & performace decrement.
Is it safe to replace the routine with older one?
Anyway, if it's just a mistake, please fix it in the next version.