[tips] using flup as trac's default fastcgi backend. (with lighttpd)

I've found trac's fastcgi backend simply out-dated. I thinks it's direct copied from an old flup source, and since then flup really updates a lot, I've already use thread pool techniques everywhere in our web applications/frameworks for a while, so current trac's fastcgi backend implement just so out-dated and looks wierd when I installed it, really.

But thanks there's WSGI to save us ! I could just replace the fastcgi backend to flup-0.5 (latest, and author claims it maybe final version of flup) and SAVE MEMORY !

and it's simple too,
just install the flup package, and edit your old trac.fcgi / lighttpd's settings.

trac.fcgi:

try:
    import pkg_resources
    
    from trac import __version__ as VERSION
    from trac.web.main import dispatch_request
 
    from flup.server.fcgi import WSGIServer   
    WSGIServer(dispatch_request,maxSpare=100,minSpare=100,maxThreads=100).run()
    
except SystemExit:
    raise
except Exception, e:
    print 'Content-Type: text/plain\r\n\r\n', 
    print 'Oops...'
    print
    print 'Trac detected an internal error:'
    print
    print e
    print
    import traceback
    import StringIO
    tb = StringIO.StringIO()
    traceback.print_exc(file=tb)
    print tb.getvalue()

you can change the line which specify
maxSpare,minSpare,maxThreads,I use 100,
you should use less than 381 if you're using
python 2.4 (you'll hit stack limit at least on i386-linux) however if you're using python 2.5 you can change stack size via thread.stack_size,
though I don't think anyone would need that high concurrency (who knows?!).

below's also a sample setting in lighttpd.conf,

what really matters here is to remember add a
"max-procs" => 1
line in it, since we've already using thread pools technique, forking another process seems redundant (and WASTE memory).

fastcgi.server += ("/sandbox" =>
                   ("sandbox" =>
                     ("socket" => "/tmp/trac-sandbox.sock", #need to change for each
                      "bin-path" => "/var/trac/cgi-bin/trac.fcgi",
                      "max-procs" => 1, #default 4
                      "check-local" => "disable",
                      "bin-environment" =>
                        ("TRAC_ENV" => "/var/trac/sandbox")   
                     )
                   )
                 )

oh, btw I'm using trac-0.11dev, but I think any version below 0.11 which implement WSGI should also works.