[Varnish] #575: Python Tools Enhancement

Varnish varnish-bugs at varnish-cache.org
Mon Oct 11 18:33:18 CEST 2010

#575: Python Tools Enhancement
 Reporter:  justquick    |       Owner:  kristian          
     Type:  enhancement  |      Status:  new               
 Priority:  low          |   Milestone:                    
Component:  varnishadm   |     Version:  trunk             
 Severity:  minor        |    Keywords:  python enhancement

Comment(by justquick):

 I look forward to seeing your changes to python-varnish!

 I separated the work among several classes so that the same process can be
 run in parallel across multiple varnish instances. The core VarnishHandler
 class is the only thing that actually does the work on talking to the
 varnish instance and can be instantiated just by itself for single
 instance use. The other classes implement run methods which are wrappers
 and only useful for multi-instance handling and threading. If you can
 think of a better way to organize it, I am open to changing the layout.

 threading.Thread has been deprecated (in py2.6) in favor of
 multiprocessing.Process because it avoids threads and uses subprocesses to
 completely eliminate the use of the GIL. It is very handy for
 thread/process intensive applications because GIL switching among threads
 can drastically impact performance. Thread performance in this application
 is not a concern of mine since there is only one thread per varnish
 instance and there shouldnt be a whole lot of switching unless you run a
 whole mess of commands at once. Implementing multiprocessing in this
 application would introduce the python>=2.6 dependency which i also dont

Ticket URL: <http://varnish-cache.org/trac/ticket/575#comment:3>
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