ShedSkin
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When you have the module on your phone or in scratchbox, you can see the dependencies with ldd: | When you have the module on your phone or in scratchbox, you can see the dependencies with ldd: | ||
ldd | ldd | ||
| - | + | libgc.so.1 => not found | |
| - | There you also will see if a dependency is missing and you have to add it to your package. | + | libpcre.so.3 => /usr/lib/libpcre.so.3 (0x40053000) |
| + | libpthread.so.0 => /lib/libpthread.so.0 (0x40079000) | ||
| + | libdl.so.2 => /lib/libdl.so.2 (0x4009a000) | ||
| + | libutil.so.1 => /lib/libutil.so.1 (0x400a5000) | ||
| + | libpython2.5.so.1.0 => /usr/lib/libpython2.5.so.1.0 (0x400b0000) | ||
| + | libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0x401d4000) | ||
| + | libm.so.6 => /lib/libm.so.6 (0x402b7000) | ||
| + | libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x4032d000) | ||
| + | libc.so.6 => /lib/libc.so.6 (0x40340000) | ||
| + | /lib/ld-linux.so.3 (0x2a000000) | ||
| + | |||
| + | There you also will see if a dependency is missing and you have to add it to your package. In the above example you can see that libgc is missing, so you should add it as a dependency to your application. | ||
Revision as of 19:59, 22 November 2010
Shed Skin is an experimental compiler, that can translate pure, but implicitly statically typed Python programs into optimized C++. It can generate stand-alone programs or extension modules that can be imported and used in larger Python programs.
For more information, check out http://code.google.com/p/shedskin/
On a simple test I could see a speed improvement of up to 18 times. The great thing is, you can more or less write normal python and then let ShedSkin convert it to C code, so it can get compiled by gcc. To see an application which uses Shedskin, have a look in SleepAnalyser. It has one file "mylib.py" which gets normal imported into the python application. How ever if there is a file mylib.so in the same folder, python will use that one.
How to use it in scratchbox
Install scratchbox as described in http://wiki.maemo.org/Documentation/Maemo_5_Final_SDK_Installation . Then install Shedskin with "apt-get install shedskin" from the Extras-Devel repository.
There is also a good tutorial of how to use it: http://shedskin.googlecode.com/files/shedskin-tutorial-0.6.html .
How to use it with the autobuilder
First of all, try to test it on your device with the deb-package generated in scratchbox. Do not forget to change the architecture to ARMEL, else it will not run:
sb-conf se FREMANTLE_ARMEL dpkg-buildpackage -sa -rfakeroot -k<my email address>
Missing depencies
The generated module is dependant on some other modules. When you have the module on your phone or in scratchbox, you can see the dependencies with ldd:
ldd
libgc.so.1 => not found
libpcre.so.3 => /usr/lib/libpcre.so.3 (0x40053000)
libpthread.so.0 => /lib/libpthread.so.0 (0x40079000)
libdl.so.2 => /lib/libdl.so.2 (0x4009a000)
libutil.so.1 => /lib/libutil.so.1 (0x400a5000)
libpython2.5.so.1.0 => /usr/lib/libpython2.5.so.1.0 (0x400b0000)
libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0x401d4000)
libm.so.6 => /lib/libm.so.6 (0x402b7000)
libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x4032d000)
libc.so.6 => /lib/libc.so.6 (0x40340000)
/lib/ld-linux.so.3 (0x2a000000)
There you also will see if a dependency is missing and you have to add it to your package. In the above example you can see that libgc is missing, so you should add it as a dependency to your application.