Russel Winder <rus...@russel.org.uk> wrote on 11/03/2010 05:11:16 PM:
> I am fairly confident I am just missing something very simple but . . .
>
> I have a (trivial) embarrassingly parallel scatter/gather code which
> compiles fine in both Java back-end and C++ back-end modes. The Java
> backend-version runs nicely using all the cores it can for the number of
> places specified in the code -- though the code runs excruciatingly
> slowly compared to Java or Scala. The point is I see the scaling that
> should be present. Using the C++ backend, it is nice and fast
> (essentially as fast as C++ coded version using asynchronous function
> calls a la C++0x) but it only ever runs on one core. So how do I get
> the runx10 command to map places to cores?
>
> Am I just being very stupid and missing the line that tells me how to do
> this?
>
> Thanks.
>
> PS I remembers to switch off PGP signing before sending this one so
> hopefully it doesn't get rejected.
Russel,
You cannot run multi-place code with runx10 -- that script only supports
launching one place at a time.
With 2.1.0 using the pgas_sockets transport, you can either use mpiexec
from an existing MPI installation to launch multiple processes, or use
the manager/launcher combination (the process is described in the
INSTALL.txt file in the distribution).
Igor
P.S. The mime type filter for the list includes application/pgp-signature,
so I'm surprised the messages still get rejected...
--
Igor Peshansky (note the spelling change!)
IBM T.J. Watson Research Center
X10: Parallel Productivity and Performance (http://x10-lang.org/)
XJ: No More Pain for XML's Gain (http://www.research.ibm.com/xj/)
"I hear and I forget. I see and I remember. I do and I understand" --
Xun Zi
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