[f2py] Re: f2py-users Digest, Vol 55, Issue 2

Hi Johanna,
Thanks for your kindly reply.
I have specified the number of the character string, however, segmentation
fault still occurs.
Could anyone help me fix it?

Here is my files:
! output.f95
subroutine output
implicit none
write(*,'(A2)') 'Hi'
end subroutine output

after executing f2py, everything went smoothly, until run it by the
following command
Python 2.6.2 (release26-maint, Apr 19 2009, 01:56:41)
[GCC 4.3.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import output
>>> output.output()
Segmentation fault



~$ f2py -c --fcompiler=gnu95 -m output output.f95
running build
running config_cc
unifing config_cc, config, build_clib, build_ext, build commands --compiler
options
running config_fc
unifing config_fc, config, build_clib, build_ext, build commands --fcompiler
options
running build_src
building extension "output" sources
f2py options: []
f2py:> /tmp/tmpflxkgj/src.linux-i686-2.6/outputmodule.c
creating /tmp/tmpflxkgj
creating /tmp/tmpflxkgj/src.linux-i686-2.6
Reading fortran codes...
Reading file 'output.f95' (format:free)
Post-processing...
Block: output
Block: output
Post-processing (stage 2)...
Building modules...
Building module "output"...
Constructing wrapper function "output"...
 output()
Wrote C/API module "output" to file
"/tmp/tmpflxkgj/src.linux-i686-2.6/outputmodule.c"
 adding '/tmp/tmpflxkgj/src.linux-i686-2.6/fortranobject.c' to sources.
 adding '/tmp/tmpflxkgj/src.linux-i686-2.6' to include_dirs.
copying /usr/lib/python2.6/dist-packages/numpy/f2py/src/fortranobject.c ->
/tmp/tmpflxkgj/src.linux-i686-2.6
copying /usr/lib/python2.6/dist-packages/numpy/f2py/src/fortranobject.h ->
/tmp/tmpflxkgj/src.linux-i686-2.6
running build_ext
customize UnixCCompiler
customize UnixCCompiler using build_ext
customize Gnu95FCompiler
Found executable /usr/bin/gfortran
customize Gnu95FCompiler using build_ext
building 'output' extension
compiling C sources
C compiler: gcc -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall
-Wstrict-prototypes -fPIC

creating /tmp/tmpflxkgj/tmp
creating /tmp/tmpflxkgj/tmp/tmpflxkgj
creating /tmp/tmpflxkgj/tmp/tmpflxkgj/src.linux-i686-2.6
compile options: '-I/tmp/tmpflxkgj/src.linux-i686-2.6
-I/usr/lib/python2.6/dist-packages/numpy/core/include
-I/usr/include/python2.6 -c'
gcc: /tmp/tmpflxkgj/src.linux-i686-2.6/outputmodule.c
gcc: /tmp/tmpflxkgj/src.linux-i686-2.6/fortranobject.c
compiling Fortran sources
Fortran f77 compiler: /usr/bin/gfortran -Wall -ffixed-form
-fno-second-underscore -fPIC -O3 -funroll-loops -march=nocona -mmmx -msse2
-msse -msse3 -fomit-frame-pointer -malign-double
Fortran f90 compiler: /usr/bin/gfortran -Wall -fno-second-underscore -fPIC
-O3 -funroll-loops -march=nocona -mmmx -msse2 -msse -msse3
-fomit-frame-pointer -malign-double
Fortran fix compiler: /usr/bin/gfortran -Wall -ffixed-form
-fno-second-underscore -Wall -fno-second-underscore -fPIC -O3 -funroll-loops
-march=nocona -mmmx -msse2 -msse -msse3 -fomit-frame-pointer -malign-double
compile options: '-I/tmp/tmpflxkgj/src.linux-i686-2.6
-I/usr/lib/python2.6/dist-packages/numpy/core/include
-I/usr/include/python2.6 -c'
gfortran:f90: output.f95
/usr/bin/gfortran -Wall -Wall -shared
/tmp/tmpflxkgj/tmp/tmpflxkgj/src.linux-i686-2.6/outputmodule.o
/tmp/tmpflxkgj/tmp/tmpflxkgj/src.linux-i686-2.6/fortranobject.o
/tmp/tmpflxkgj/output.o -lgfortran -o ./output.so
running scons
Removing build directory /tmp/tmpflxkgj


2009/9/17  <f2py-users-request-Y4l6ocDipWCuvFJfX82//[email protected]>:
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> Today's Topics:
>
>   1. Segmentation fault for format write (Shang-Jun Ye)
>   2. RE: Segmentation fault for format write (Torppa Johanna)
>   3. control number of OpenMP threads at runtime (Steve Schmerler)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Wed, 16 Sep 2009 11:51:57 +0100
> From: Shang-Jun Ye <[email protected]>
> Subject: [f2py] Segmentation fault for format write
> To: f2py-users-Y4l6ocDipWCuvFJfX82//[email protected]
> Message-ID:
>        <a0f7437b0909160351p22e25dcdncbce361367f786e8-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
> Content-Type: text/plain; charset=ISO-8859-1
>
> Hi,
> I try to integrate a Fortran output subroutine by Python, the f2py
> runs successfully, however, when I run the script, I have got a
> Segmentation fault without any more infomation. does f2py support
> format write?
> here is my Fortran subroutine :
> ! output.f95
> subroutine output
> implicit none
>  write(*,'(1x,a)') 'write something'
> !write(*,*)'write something' !works well
>
> end subroutine output
>
> the corresponding python script is
> import output
> output.output()
> ! >>>Segmentation fault
>
>
>
> ------------------------------
>
> Message: 2
> Date: Wed, 16 Sep 2009 14:28:23 +0300
> From: Torppa Johanna <[email protected]>
> Subject: RE: [f2py] Segmentation fault for format write
> To: For users of the f2py program <f2py-users-Y4l6ocDipWCuvFJfX82//[email protected]>
> Message-ID:
>
 <CDC71670B5C4D842B22F4C56819D4D8CB8EC3E27C1-YItVQVvtHi9tTTueRX380nsDi8qcUmLV0e7PPNI6Mm0@public.gmane.org>
>
> Content-Type: text/plain; charset="us-ascii"
>
>
> Formatted output with the 'write' command should work. With both strings
and numbers. Try to define the number of string digits, e.g., A20.
>
> bw, Johanna Torppa
>
> -----Original Message-----
> From: f2py-users-bounces-Y4l6ocDipWCuvFJfX82//[email protected] [mailto:
f2py-users-bounces-Y4l6ocDipWCuvFJfX82//[email protected]] On Behalf Of Shang-Jun Ye
> Sent: 16. syyskuuta 2009 13:52
> To: f2py-users-Y4l6ocDipWCuvFJfX82//[email protected]
> Subject: [f2py] Segmentation fault for format write
>
> Hi,
> I try to integrate a Fortran output subroutine by Python, the f2py
> runs successfully, however, when I run the script, I have got a
> Segmentation fault without any more infomation. does f2py support
> format write?
> here is my Fortran subroutine :
> ! output.f95
> subroutine output
> implicit none
>  write(*,'(1x,a)') 'write something'
> !write(*,*)'write something' !works well
>
> end subroutine output
>
> the corresponding python script is
> import output
> output.output()
> ! >>>Segmentation fault
>
> _______________________________________________
> f2py-users mailing list
> f2py-users-Y4l6ocDipWCuvFJfX82//[email protected]
> http://cens.ioc.ee/mailman/listinfo/f2py-users
>
>
>
> ------------------------------
>
> Message: 3
> Date: Thu, 17 Sep 2009 10:13:10 +0200
> From: Steve Schmerler <[email protected]>
> Subject: [f2py] control number of OpenMP threads at runtime
> To: f2py-users <f2py-users-Y4l6ocDipWCuvFJfX82//[email protected]>
> Message-ID: <20090917081310.GA3701-uj/[email protected]>
> Content-Type: text/plain; charset=us-ascii
>
> Hi
>
> I use OpenMP to speed up subroutines in my extension modules. I don't
> set the number of threads in the code (e.g. with !$omp parallel
> num_threads(N) or omp_set_num_threads(N)).
>
> Without these the code runs 4 threads on a quad-core box. The problem
> is: the extension module does not seem to honor the OMP_NUM_THREADS
> environment var (it does for a "normal" Fortran executable). How do I
> control the number of threads at runtime for the extension module?
>
> best,
> Steve
>
>
>
> ------------------------------
>
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>
> End of f2py-users Digest, Vol 55, Issue 2
> *****************************************
>

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