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POmod_wsgi daemon mode, WSGIApplicationGroup and Python interpreter separation
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5021424
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2011-02-16T19:54:30.783
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2014-11-03T17:36:36.973
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2014-11-03T17:36:36.973
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Body
I have Apache with 2 virtual hosts, each having a Django site attached using mod_wsgi, daemon mode, like this: <pre><code><VirtualHost 123.123.123.123:80> WSGIDaemonProcess a.com user=x group=x processes=5 threads=1 WSGIProcessGroup a.com WSGIApplicationGroup %{GLOBAL} </VirtualHost> <VirtualHost 123.123.123.123:80> WSGIDaemonProcess b.com user=x group=x processes=5 threads=1 WSGIProcessGroup b.com WSGIApplicationGroup %{GLOBAL} </VirtualHost> </code></pre> I use <code>WSGIApplicationGroup %{GLOBAL}</code> because of <a href="http://trac.xapian.org/ticket/185" rel="nofollow noreferrer">a known problem with Xapian</a>. Now, if I understand what's going on behind the scenes, mod_wsgi launches 5 daemon processes for each of my sites. I can see this in Apache log: <pre><code>[info] mod_wsgi (pid=8106): Attach interpreter ''. [info] mod_wsgi (pid=8106): Adding '.../lib/python2.5/site-packages' to path. [info] mod_wsgi (pid=8106): Enable monitor thread in process 'a.com'. [info] mod_wsgi (pid=8106): Enable deadlock thread in process 'a.com'. [info] mod_wsgi (pid=8107): Attach interpreter ''. [info] mod_wsgi (pid=8107): Adding '.../lib/python2.5/site-packages' to path. [info] mod_wsgi (pid=8107): Enable monitor thread in process 'a.com'. [info] mod_wsgi (pid=8107): Enable deadlock thread in process 'a.com'. ... </code></pre> What I don't understand is if those <code>"Attach interpreter ''"</code> lines indicate that all of those processes share the same Python interpreter, or if there is one interpreter per process. (BTW I realize that the empty interpreter name '' is caused by passing <code>%{GLOBAL}</code> to <code>WSGIApplicationGroup</code>). I tried checking if maybe <code>sys.path</code> entries cumulated in subsequent processes, but they didn't - which could indicate that there's a separate Python interpreter for each of the 5 daemon processes... but I don't quite understand all these things so I'm asking here.
Tags
<python><apache><mod-wsgi>
Title
mod_wsgi daemon mode, WSGIApplicationGroup and Python interpreter separation
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1. USTomasz Zielinski
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1. USTomasz Zielinski
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