mohammed elsaeedy <mohammed.elsae...@kaust.edu.sa> wrote on 06/30/2010
06:03:55 AM:
> Dear all,
>
> I'm totally new to X10, and I'm intending to implement some linear
> kernels with it, I have some questions that I hope you
> could help me with, first, what is the Java and C++ back ends of the
X10?
> What is the difference? does this mean that the X10
> code is ported to Java or C++ eventually? because if I'm going to
compare my
> linear kernels to MPI for example then I'll need to
> make a fair comparison, i.e I can't compare Java to Fortran.
Hi, Mohammed,
Thank you for your interest in X10.
The compilation strategy for X10 is to generate code in another language,
Java or C++, which is then compiled or interpreted by the corresponding
tools. So, the Java backend for X10 generates Java code and then uses the
JVM to execute the generated program. The C++ backend generates C++
source,
which is then post-compiled by a C++ compiler (g++ or xlC) to the target
architecture.
At the moment, the C++ backend is the only one that supports multi-node
execution (the Java backend is SMP-only until later this year). So, if
you
want to compare your X10 program with MPI code running in FORTRAN, then
the
C++ backend is your only option.
Please read the instructions on the various transports that can be used by
the X10 C++ backend. In particular, X10 can link to (and run on top of)
MPI itself, as well as use more specialized transports for various
architectures (e.g., BG/P).
Let us know if you have more questions,
Igor
--
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" --
Confucius
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