Thank you, and Jeff, for clarification.
Before I bother you all more without the need, I should probably say I
was hoping to use libfabric/OpenMPI on an InfiniBand cluster. Somehow
now I feel I have confused this altogether, so maybe I should go one
step back:
1. libfabric is hardware independent, and does support Infiniband, right?
2. I read that OpenMPI provides interface to libfabric through
btl/usnic and mtl/ofi. can any of those use libfabric on Infiniband
networks?
Please forgive my ignorance, the amount of different options is rather
overwhelming..
Marcin
On 09/30/2015 04:26 PM, Howard Pritchard wrote:
Hello Marcin
What configure options are you using besides with-libfabric?
Could you post your config.log file tp the list?
Looks like you only install fi_ext_usnic.h if you could build the
usnic libfab provider. When you configured libfabric what providers
were listed at the end of configure run? Maybe attach config.log from
the libfabric build ?
If your cluster has cisco usnics you should probably be using
libfabric/cisco openmpi. If you are using intel omnipath you may want
to try the ofi mtl. Its not selected by default however.
Howard
----------
sent from my smart phonr so no good type.
Howard
On Sep 30, 2015 5:35 AM, "Marcin Krotkiewski"
<marcin.krotkiew...@gmail.com <mailto:marcin.krotkiew...@gmail.com>>
wrote:
Hi,
I am trying to compile the 2.x branch with libfabric support, but
get this error during configure:
configure:100708: checking rdma/fi_ext_usnic.h presence
configure:100708: gcc -E
-I/cluster/software/VERSIONS/openmpi.gnu.2.x/include
-I/usit/abel/u1/marcink/software/ompi-release-2.x/opal/mca/hwloc/hwloc1110/hwloc/include
conftest.c
conftest.c:688:31: fatal error: rdma/fi_ext_usnic.h: No such file
or directory
[...]
configure:100708: checking for rdma/fi_ext_usnic.h
configure:100708: result: no
configure:101253: checking if MCA component btl:usnic can compile
configure:101255: result: no
Which is correct - the file is not there. I have downloaded fresh
libfabric-1.1.0.tar.bz2 and it does not have this file. Probably
OpenMPI needs some updates?
I am also wondering what is the state of libfabric support in
OpenMPI nowadays. I have seen recent (March) presentation about
it, so it seems to be an actively developed feature. Is this
correct? It seemed from the presentation that there are benefits
to this approach, but is it mature enough in OpenMPI, or it will
yet take some time?
Thanks!
Marcin
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