As described at the documents, WSGIApplication directive "can be used to
specify which application group a WSGI application or set of WSGI applications
belongs to. All WSGI applications within the same application group will
execute within the context of the same Python sub interpreter. " .
In the source code, all sub interpreters are stored at a global variable
"wsgi_interpreters" and it is shared within a daemon process. I just curious
about the situation when multiple daemon processes (within the same process
group or not, whatever) are serving at the same time, WSGI applications, which
are within a same application group, will probably be execute at different
daemon process or even process group, depending on the configuration. So at
that case, WSGI applications don't execute witnin the context of the same
python sub interpreter. Considering the following cases:
1. Considering the following httpd.conf file, all scripts at /usr/wsgi/script
and /usr/wsgi/script2 belong to process group www.site1.com and www.site12.com
respectively, but to the same application group joshua_app_group_1, then all
scripts at /usr/wsgi/script/ and those at /usr/wsgi/script2/ will execute
within two distinct sub interpreters whose name are both 'joshua_app_group_1'.
WSGIScriptAlias /wsgi/script "/usr/wsgi/script/"
WSGIScriptAlias /wsgi/script2 "/usr/wsgi/script2/"
WSGIDaemonProcess www.site2.com processes=2 threads=25
display-name=%{GROUP}
WSGIDaemonProcess www.site1.com processes=2 threads=25
display-name=%{GROUP}
<Directory "/usr/wsgi/script/">
WSGIProcessGroup www.site1.com
WSGIApplicationGroup joshua_app_group_1
Allow from all
</Directory>
<Directory "/usr/wsgi/script2/">
WSGIProcessGroup www.site2.com
WSGIApplicationGroup joshua_app_group_1
Allow from all
</Directory>
2. unlike the previously case, all scripts at /usr/wsgi/script/ belong to the
same process group and application group, but multiple daemon process are still
serving. It still isn't guarantee that all scripts will execute at the same sub
interpreter. Actually, two sub interpreters named "joshua_app_group" will be
created at each daemon process. Which sub interpreter will be designated to
excute the script depends on which daemon process is designated to handle the
request.
WSGIScriptAlias /wsgi/script "/usr/wsgi/script/"
WSGIDaemonProcess www.site.com processes=2 threads=25
display-name=%{GROUP}
<Directory "/usr/wsgi/script/">
WSGIProcessGroup www.site.com
WSGIApplicationGroup joshua_app_group
Allow from all
</Directory>
So my conclusion is the scripts within the same application group "will execute
within the context of the same Python sub interpreter" if and only if those
scripts execute at a same process, daemon process(daemon mode) or Apache child
process ( embedded mode).
Is the conclusion correct, or I just misunderstand something? Any comments are
welcome. Thanks!
2009-06-22
Joshua Wang
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