mirror of
https://github.com/python/cpython.git
synced 2024-12-12 11:23:56 +08:00
94800df632
svn+ssh://pythondev@svn.python.org/python/branches/py3k ........ r88430 | georg.brandl | 2011-02-15 20:48:59 +0100 (Di, 15 Feb 2011) | 1 line #730467: Another small AIX fix. ........ r88438 | georg.brandl | 2011-02-19 09:44:47 +0100 (Sa, 19 Feb 2011) | 1 line #10709: add back an updated AIX-NOTES (as README.AIX). ........ r88440 | georg.brandl | 2011-02-19 09:58:23 +0100 (Sa, 19 Feb 2011) | 1 line #11184: Fix large file support on AIX. ........
138 lines
5.0 KiB
Plaintext
138 lines
5.0 KiB
Plaintext
|
|
This documentation tries to help people who intend to use Python on
|
|
AIX.
|
|
|
|
There used to be many issues with Python on AIX, but the major ones
|
|
have been corrected for version 3.2, so that Python should now work
|
|
rather well on this platform. The remaining known issues are listed in
|
|
this document.
|
|
|
|
|
|
======================================================================
|
|
Compiling Python
|
|
----------------------------------------------------------------------
|
|
|
|
You can compile Python with gcc or the native AIX compiler. The native
|
|
compiler used to give better performances on this system with older
|
|
versions of Python. With Python 3.2 it may not be the case anymore,
|
|
as this compiler does not allow compiling Python with computed gotos.
|
|
Some benchmarks need to be done.
|
|
|
|
Compiling with gcc:
|
|
|
|
cd Python-3.2
|
|
CC=gcc OPT="-O2" ./configure --enable-shared
|
|
make
|
|
|
|
There are various aliases for the native compiler. The recommended
|
|
alias for compiling Python is 'xlc_r', which provides a better level of
|
|
compatibility and handles thread initialization properly.
|
|
|
|
It is a good idea to add the '-qmaxmem=70000' option, otherwise the
|
|
compiler considers various files too complex to optimize.
|
|
|
|
Compiling with xlc:
|
|
|
|
cd Python-3.2
|
|
CC=xlc_r OPT="-O2 -qmaxmem=70000" ./configure --without-computed-gotos --enable-shared
|
|
make
|
|
|
|
Note:
|
|
On AIX 5.3 and earlier, you will also need to specify the
|
|
"--disable-ipv6" flag to configure. This has been corrected in AIX
|
|
6.1.
|
|
|
|
|
|
======================================================================
|
|
Memory Limitations
|
|
----------------------------------------------------------------------
|
|
|
|
Note: this section may not apply when compiling Python as a 64 bit
|
|
application.
|
|
|
|
By default on AIX each program gets one segment register for its data
|
|
segment. As each segment register covers 256 MB, a Python program that
|
|
would use more than 256MB will raise a MemoryError. The standard
|
|
Python test suite is one such application.
|
|
|
|
To allocate more segment registers to Python, you must use the linker
|
|
option -bmaxdata or the ldedit tool to specify the number of bytes you
|
|
need in the data segment.
|
|
|
|
For example, if you want to allow 512MB of memory for Python (this is
|
|
enough for the test suite to run without MemoryErrors), you should run
|
|
the following command at the end of compilation:
|
|
|
|
ldedit -b maxdata:0x20000000 ./python
|
|
|
|
You can allow up to 2GB of memory for Python by using the value
|
|
0x80000000 for maxdata.
|
|
|
|
It is also possible to go beyond 2GB of memory by activating Large
|
|
Page Use. You should consult the IBM documentation if you need to use
|
|
this option. You can also follow the discussion of this problem
|
|
in issue 11212 at bugs.python.org.
|
|
|
|
http://publib.boulder.ibm.com/infocenter/aix/v6r1/index.jsp?topic=/com.ibm.aix.cmds/doc/aixcmds3/ldedit.htm
|
|
|
|
|
|
======================================================================
|
|
Known issues
|
|
----------------------------------------------------------------------
|
|
|
|
Those issues are currently affecting Python on AIX:
|
|
|
|
* Python has not been fully tested on AIX when compiled as a 64 bit
|
|
application.
|
|
|
|
* issue 3526: the memory used by a Python process will never be
|
|
released to the system. If you have a Python application on AIX that
|
|
uses a lot of memory, you should read this issue and you may
|
|
consider using the provided patch that implements a custom malloc
|
|
implementation
|
|
|
|
* issue 11184: support for large files is currently broken
|
|
|
|
* issue 11185: os.wait4 does not behave correctly with option WNOHANG
|
|
|
|
* issue 1745108: there may be some problems with curses.panel
|
|
|
|
* issue 11192: test_socket fails
|
|
|
|
* issue 11190: test_locale fails
|
|
|
|
* issue 11193: test_subprocess fails
|
|
|
|
* issue 9920: minor arithmetic issues in cmath
|
|
|
|
* issue 11215: test_fileio fails
|
|
|
|
* issue 11188: test_time fails
|
|
|
|
|
|
======================================================================
|
|
Implementation details for developers
|
|
----------------------------------------------------------------------
|
|
|
|
Python and python modules can now be built as shared libraries on AIX
|
|
as usual.
|
|
|
|
AIX shared libraries require that an "export" and "import" file be
|
|
provided at compile time to list all extern symbols which may be
|
|
shared between modules. The "export" file (named python.exp) for the
|
|
modules and the libraries that belong to the Python core is created by
|
|
the "makexp_aix" script before performing the link of the python
|
|
binary. It lists all global symbols (exported during the link) of the
|
|
modules and the libraries that make up the python executable.
|
|
|
|
When shared library modules (.so files) are made, a second shell
|
|
script is invoked. This script is named "ld_so_aix" and is also
|
|
provided with the distribution in the Modules subdirectory. This
|
|
script acts as an "ld" wrapper which hides the explicit management of
|
|
"export" and "import" files; it adds the appropriate arguments (in the
|
|
appropriate order) to the link command that creates the shared module.
|
|
Among other things, it specifies that the "python.exp" file is an
|
|
"import" file for the shared module.
|
|
|
|
This mechanism should be transparent.
|