On Aug 9, 2005, at 8:48 AM, Sridhar Chirravuri wrote:
Does r6774 has lot of changes that are related to 3rd generation
point-to-point? I am trying to run some benchmark tests (ex:
pallas) with Open MPI stack and just want to compare the
performance figures with MVAPICH 095 and MVAPICH 092.
In order to use 3rd generation p2p communication, I have added the
following line in the /openmpi/etc/openmpi-mca-params.conf
pml=ob1
I also exported (as double check) OMPI_MCA_pml=ob1.
Then, I have tried running on the same machine. My machine has got
2 processors.
Mpirun -np 2 ./PMB-MPI1
I still see the following lines
Request for 0 bytes (coll_basic_reduce_scatter.c, 79)
Request for 0 bytes (coll_basic_reduce.c, 193)
Request for 0 bytes (coll_basic_reduce_scatter.c, 79)
Request for 0 bytes (coll_basic_reduce.c, 193)
These errors are coming from the collective routines, not the PML/BTL
layers. It looks like the reduction codes are trying to call malloc
(0), which doesn't work so well. We'll take a look as soon as we
can. In the mean time, can you just not run the tests that call the
reduction collectives?
Brian
--
Brian Barrett
Open MPI developer
http://www.open-mpi.org/
