Hi Tim,
Well, in general and not on MIC I usually build the MPI stacks using the
Intel compiler set. Have you ran into s/w that requires GCC instead of
Intel
compilers (beside Nvidia Cuda)? Did you try to use Intel compiler to
produce
MIC native code (the OpenMPI stack for that matter)?
[Tom]
Good idea Michael, With the Intel Compiler, I would use the -mmic flag to
build MIC code.
Tim wrote: “My first pass at doing a cross-compile with the GNU compilers
failed to produce something with OFED support (not surprising)
export PATH=/usr/linux-k1om-4.7/bin:$PATH
./configure --build=x86_64-unknown-linux-gnu --host=x86_64-k1om-linux \
--disable-mpi-f77
checking if MCA component btl:openib can compile... no
Regarding a Gnu cross compiler, this worked for one of our engineers
building for True Scale HCAs and PSM/infinipath. But it may give useful
tips for building for btl:openib as well:
3. How to configure/compile OpenMPI:
a). untar the openmpi tarball.
b). edit configure in top directory, add '-linfinipath' after
'-lpsm_infinipath "
but not necessary for messages, only for command lines.
c). run the following script,
#!/bin/sh
./configure \
--host=x86_64-k1om-linux \
--enable-mpi-f77=no --enable-mpi-f90=no \
--with-psm=/…/psm-7.6 \
--prefix=/…/openmpi \
CC=x86_64-k1om-linux-gcc CXX=x86_64-k1om-linux-g++ \
AR=x86_64-k1om-linux-ar RANLIB=x86_64-k1om-linux-ranlib
d). run 'make' and 'make install'
OK, I see that they did not configure for mpi-f77 & mpif90, but perhaps
this
is still helpful, if the AR and RANLIB flags are important.
-Tom
regards
Michael
On Mon, Jul 8, 2013 at 4:30 PM, Tim Carlson <tim.carl...@pnl.gov> wrote:
On Mon, 8 Jul 2013, Elken, Tom wrote:
It isn't quite so easy.
Out of the box, there is no gcc on the Phi card. You can use the cross
compiler on the host, but you don't get gcc on the Phi by default.
See this post http://software.intel.com/en-us/forums/topic/382057
I really think you would need to build and install gcc on the Phi first.
My first pass at doing a cross-compile with the GNU compilers failed to
produce something with OFED support (not surprising)
export PATH=/usr/linux-k1om-4.7/bin:$PATH
./configure --build=x86_64-unknown-linux-gnu --host=x86_64-k1om-linux \
--disable-mpi-f77
checking if MCA component btl:openib can compile... no
Tim
Thanks Tom, that sounds good. I will give it a try as soon as
our Phi host
here host gets installed.
I assume that all the prerequisite libs and bins on the Phi side
are
available when we download the Phi s/w stack from Intel's site,
right ?
[Tom]
Right. When you install Intel’s MPSS (Manycore Platform
Software Stack),
including following the section on “OFED Support” in the readme
file, you
should have all the prerequisite libs and bins. Note that I
have not built
Open MPI for Xeon Phi for your interconnect, but it seems to me
that it
should work.
-Tom
Cheers
Michael
On Mon, Jul 8, 2013 at 12:10 PM, Elken, Tom
<tom.el...@intel.com> wrote:
Do you guys have any plan to support Intel Phi in the future?
That is,
running MPI code on the Phi cards or across the multicore and
Phi, as Intel
MPI does?
[Tom]
Hi Michael,
Because a Xeon Phi card acts a lot like a Linux host with an x86
architecture, you can build your own Open MPI libraries to serve
this
purpose.
Our team has used existing (an older 1.4.3 version of) Open MPI
source to
build an Open MPI for running MPI code on Intel Xeon Phi cards
over Intel’s
(formerly QLogic’s) True Scale InfiniBand fabric, and it works
quite well.
We have not released a pre-built Open MPI as part of any Intel
software
release. But I think if you have a compiler for Xeon Phi
(Intel Compiler
or GCC) and an interconnect for it, you should be able to build
an Open MPI
that works on Xeon Phi.
Cheers,
Tom Elken
thanks...
Michael
On Sat, Jul 6, 2013 at 2:36 PM, Ralph Castain <r...@open-mpi.org>
wrote:
Rolf will have to answer the question on level of support. The
CUDA code is
not in the 1.6 series as it was developed after that series went
"stable".
It is in the 1.7 series, although the level of support will
likely be
incrementally increasing as that "feature" series continues to
evolve.
On Jul 6, 2013, at 12:06 PM, Michael Thomadakis
<drmichaelt7...@gmail.com>
wrote:
> Hello OpenMPI,
>
> I am wondering what level of support is there for CUDA and
GPUdirect on
OpenMPI 1.6.5 and 1.7.2.
>
> I saw the ./configure --with-cuda=CUDA_DIR option in the FAQ.
However, it
seems that with configure v1.6.5 it was ignored.
>
> Can you identify GPU memory and send messages from it directly
without
copying to host memory first?
>
>
> Or in general, what level of CUDA support is there on 1.6.5
and 1.7.2 ? Do
you support SDK 5.0 and above?
>
> Cheers ...
> Michael
> _______________________________________________
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> us...@open-mpi.org
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