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Chad Whitacre
chad at zetaweb.com
Fri Sep 1 17:17:27 EDT 2006
All,
Perhaps I ought to include more detail. Below are my install notes thus
far. Thanks.
chad
========================================
INSTALLING MOD_PYTHON ON FREEBSD
========================================
Download from http://www.modpython.org/
$ ./configure --with-apxs=/usr/local/apache2/bin/apxs
$ make
$ sudo make install
Unfortunately, doing the standard dance on FreeBSD gives you the
following error when you try to LoadModule:
Syntax error on line 36 of /usr/local/apache2/conf/httpd.conf:
Cannot load /usr/local/apache2/modules/mod_python.so into server:
/usr/local/apache2/modules/mod_python.so: Undefined symbol
"pthread_attr_init"
"[T]hreads do not work well with Apache on FreeBSD",[1] so Apache does
not build with them by default on FreeBSD. You can get mod_python to
minimally work by compiling Apache with --enable-threads,[2] but using a
threaded Apache on FreeBSD does indeed appear to be a bad idea:
* "The general experience is that after not very long, Apache starts
eating 100% of the CPU and not answering queries."[3]
* "After doing a apache benchmark test with 'ab' I see a lot of
stuck http gets in /server-status listing."[4]
Grisha's answer is to "cause Apache to start with threaded libs"[5] by
adding this to /usr/local/apache2/bin/envvars:[6]
export LD_PRELOAD=/usr/lib/libc_r.so
But is this the same as compiling Apache with --enable-threads? There be
dragons, as noted above. Per ld.so(1),[7] LD_PRELOAD denotes "[a] list
of shared libraries, separated by colons and/or white space, to be
linked in before any other shared libraries." And here my knowledge
ends: does linking in the library mean that Apache uses it (acquires
threadedness), or just that mod_python does? Does this mean I can use
threads from Python?
Here's the thread on this problem on the mod_python dev list:
* Re: FreeBSD compile problem (was Getting ready for 3.2 beta 2)[8]
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[1]
http://mail-archives.apache.org/mod_mbox/httpd-python-dev/200509.mbox/%[email protected]%3e
[2]
http://www.monkey.org/freebsd/archive/freebsd-questions/200506/msg02836.html
[3] http://archives.seul.org/or/dev/Sep-2003/msg00016.html
[4]
http://lists.freebsd.org/pipermail/freebsd-apache/2005-November/000404.html
[5]
http://mail-archives.apache.org/mod_mbox/httpd-python-dev/200509.mbox/%[email protected]%3e
[6]
http://mail-archives.apache.org/mod_mbox/httpd-python-dev/200509.mbox/%[email protected]%3e
[7]
http://www.freebsd.org/cgi/man.cgi?query=ld.so&manpath=FreeBSD+6.0-RELEASE
[8]
http://mail-archives.apache.org/mod_mbox/httpd-python-dev/200509.mbox/thread
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