Hi,
I have installed openmpi-v3.x-201705250239-d5200ea on my "SUSE Linux
Enterprise Server 12.2 (x86_64)" with Sun C 5.14 and gcc-7.1.0.
Depending on the machine that I use to start my processes, I have
a problem with "--host" for versions "v3.x" and "master", while
everything works as expected with earlier versions.
loki hello_1 111 mpiexec -np 3 --host loki:2,exin hello_1_mpi
--------------------------------------------------------------------------
There are not enough slots available in the system to satisfy the 3 slots
that were requested by the application:
hello_1_mpi
Either request fewer slots for your application, or make more slots available
for use.
--------------------------------------------------------------------------
Everything is ok if I use the same command on "exin".
exin fd1026 107 mpiexec -np 3 --host loki:2,exin hello_1_mpi
Process 0 of 3 running on loki
Process 1 of 3 running on loki
Process 2 of 3 running on exin
...
Everything is also ok if I use openmpi-v2.x-201705260340-58c6b3c on "loki".
loki hello_1 114 which mpiexec
/usr/local/openmpi-2.1.2_64_cc/bin/mpiexec
loki hello_1 115 mpiexec -np 3 --host loki:2,exin hello_1_mpi
Process 0 of 3 running on loki
Process 1 of 3 running on loki
Process 2 of 3 running on exin
...
"exin" is a virtual machine on QEMU so that it uses a slightly different
processor architecture, e.g., it has no L3 cache but larger L2 caches.
loki fd1026 117 cat /proc/cpuinfo | grep -e "model name" -e "physical id" -e
"cpu cores" -e "cache size" | sort | uniq
cache size : 15360 KB
cpu cores : 6
model name : Intel(R) Xeon(R) CPU E5-2620 v3 @ 2.40GHz
physical id : 0
physical id : 1
loki fd1026 118 ssh exin cat /proc/cpuinfo | grep -e "model name" -e "physical
id" -e "cpu cores" -e "cache size" | sort | uniq
cache size : 4096 KB
cpu cores : 6
model name : Intel Core Processor (Haswell, no TSX)
physical id : 0
physical id : 1
Any ideas what's different in the newer versions of Open MPI? Is the new
behavior intended? I would be grateful, if somebody can fix the problem,
if "mpiexec -np 3 --host loki:2,exin hello_1_mpi" should print my messages
in versions "3.x" and "master" as well, if the programs are started on any
machine. Do you need anything else? Thank you very much for any help in
advance.
Kind regards
Siegmar
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