hiiz...@gmail.com wrote on 01/08/2011 03:58:02 PM:
> Hello, X10 users
>
> I am writing this post about the question that is related to the the
size of
> EXE file based on the C++ backend.
>
> When it comes to compiling *.x10 source code, I would like to know the
> difference between one and two steps.
>
> In other words, due to some reasons, I am using the two-step-compile
way:
> (1) compile *.x10 to *.cc, then (2) *.cc to binary.
> When I use the two-step-compile, the final executable binary file size
is
> bigger than the one-step-compile -- compiling *.x10 to binary.
>
> Specifically, it would be about 3 times as bigger as the one by the one
step
> compile way. As my observation of the compile, it seemed to me that it
took
> longer time to generate the procedure of the final executable,
> rather than dealing with object files (*.o).
>
> It would be helpful if you give me some comments or advice.
>
> -----------------------------------------------------------------------
> Here are my system environment informations:
> -----------------------------------------------------------------------
> $ OS: Linux 2.6.32-26-generic-Ubuntu
> $ x10c++ version: 2.1.1
> $ g++ --version: g++ (Ubuntu 4.4.3-4ubuntu5) 4.4.3
> $ javac -version: javac 1.6.0_20
> $ java -version: java version "1.6.0_20"
> $ mpicxx --version: c++ (Ubuntu 4.4.3-4ubuntu5) 4.4.3
> -----------------------------------------------------------------------
>
> Attached is my Makefile, in which I used "make postmpicxx".
Hi, Myoungkyu,
You have not indicated what arguments you were using when invoking x10c++
for the single-step compilation.
However, you can give the "-report postcompile=1" arguments to x10c++ to
have it print out the exact post-compilation command it used. Then it's
up to you to compare the two post-compilation commands to see what may be
causing your code bloat.
My suspicion is that, unless you built with -x10rt mpi, x10c++ by default
does not use mpicxx as its postcompiler, and thus you are linking an
MPI library into a non-MPI executable, whereas with the single step
compilation this does not happen. But you should see that from the output
of the above command.
Hope this helps,
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" --
Xun Zi
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