When -x10rt mpi is specified, X10 uses 'mpicxx' as the post compiler.
So to run the resulting executable, whatever is in LD_LIBRARY_PATH must
be consistent with the libraries linked by mpicxx.
You could specify a particular version of MPI to use as the post
compiler i.e.
$ x10c++ ... -post '/path/to/openmpi/bin/mpicxx # #
-I/path/to/openmpi/include/openmpi/ompi # -L/path/to/openmpi/lib ...'
(see
http://x10-lang.org/documentation/practical-x10-programming/native-code-integration.html)
... but this is probably overcomplicating it. Just make sure that your
environment is set up so that 'mpicxx' is the version you want.
Can you compile and run a simple MPI program using the same environment
(including LD_LIBRARY_PATH) as you are using for X10?
Cheers,
Josh
On 19/02/13 09:04, Sparsh Mittal wrote:
Thanks a lot. On my cluster, there are two mpi installations. The
default is old and what I installed is newer.
On compiling I get an error:
x10c++ -x10rt mpi MontePiCluster.x10 -o montepiobj -O
x10c++: /usr/bin/ld: warning: libmpi_cxx.so.1, needed by
~/X10Source/x10.dist/lib/*libx10rt_mpi.so, not found* (try using
-rpath or -rpath-link)
/usr/bin/ld: warning: libmpi.so.1, needed by
~/X10Source/x10.dist/lib/libx10rt_mpi.so, not found (try using -rpath
or -rpath-link)
~/X10Source/x10.dist/lib/libx10rt_mpi.so: undefined reference to
`MPI_Op_commutative'
~/X10Source/x10.dist/lib/libx10rt_mpi.so: undefined reference to
`MPI_Reduce_local'
collect2: ld returned 1 exit status
x10c++: Non-zero return code: 1
So I provided the path of newer installation using LD_LIBRARY_PATH. It
compiles but gives warning:
x10c++: /usr/bin/ld: warning: libmpi_cxx.so.1, needed by
~/X10Source/x10.dist/lib/libx10rt_mpi.so, may conflict with
libmpi_cxx.so.0
/usr/bin/ld: warning: libmpi.so.1, needed by
~/X10Source/x10.dist/lib/libx10rt_mpi.so, may conflict with libmpi.so.0
Moreover, on running it crashes!
My question is: can we specify the location of MPI from which X10
should connect, at the time we compile X10? I tried to see but could
not ascertain. I had compiled X10 as:
cd x10.dist && ant dist -DX10RT_MPI=true
Please let me know. Thanks a lot for your help.
Thanks and Regards
Sparsh Mittal
On Mon, Feb 18, 2013 at 2:27 PM, Josh Milthorpe
<josh.miltho...@anu.edu.au <mailto:josh.miltho...@anu.edu.au>> wrote:
Hi Sparsh,
to use MPI you must compile using the MPI version of X10RT.
$ /x10c++ //-x10rt mpi MontePiCluster.x10 -o montepiobj -O/
http://x10-lang.org/documentation/practical-x10-programming/x10rt-implementations.html
Cheers,
Josh
On 19/02/13 04:22, Sparsh Mittal wrote:
Hello
I am trying to run
http://x10-lang.org/documentation/code-examples/small-examples.html?id=103
example with MPI, as follows:
/export X10_NPLACES=2
x10c++ //MontePiCluster.x10 -o montepiobj -O
mpirun -np 4 ./montepiobj 1000 2 4
/
Here ./montepiobj 1000 2 4 tells to run with 1000 guesses, at 2
places with 4 threads.
In the MontePiCluster.x10 file, I have just added one statement:
/Console.OUT.println(" I am running at "+ places + " places ");/
So, the output comes:
/I am running at 2 places
I am running at 2 places
The value of pi is 3.112
I am running at 2 places
The value of pi is 3.112
The value of pi is 3.112
I am running at 2 places
The value of pi is 3.112/
So, my expectation was that with /-np *4,*/
and/**/X10/*_*/NPLACES=2/*, */it will make it 4*2 = 8 places; but
what is happening right now is that same m1 is being run at 4 mpi
processors. How can we use the mpi processor so that value of pi
is calculated at 8 places (only then using MPI is of any use )
and not at 2 places, repeated at 4 processors.
I will be thankful for your answers.
Thanks and Regards
Sparsh Mittal
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