-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 This is relevant: http://docs.python.org/api/threads.html http://www.pyzine.com/Issue001/Section_Articles/article_ThreadingGlobalInterpreter.html
But notice some C extensions do allow concurrency by releasing the GIL. Most I/O operations in the standard library do that. And probably the network library used by python to connect to MySQL does that too. However, if I got everything Jon explained, the problems happens even with several DB servers. :? Best regards, Manuel. Sours, Kevin wrote: > What it sounds like is that Python is using a "sequential" threading > model. I don't know about Python in particular, but some languages > implement a sequential model internally so that multithreaded programs > will run correctly (if not effeciently) in the absense of whatever > thread libraries the language uses for normal threading. > > As an aside, something I learned the hard way is that Python doesn't > thread very well. The documentation talks a lot about threading, but in > most instances only one thread can run at a given time (it should still > swap between threads, though). I never saw any benefit to increasing > z-server-threads beyond 4 -- all the extra threads are going to do is > consume memory. If you need get real concurrency (for example to make > use of additional processors) you need to run multiple zope processes. > Kevin > > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of > Jon Emmons > Sent: Friday, May 23, 2008 8:10 AM > To: 'Jaroslav Lukesh'; zope@zope.org > Subject: RE: [Zope] Multithreading sessions > > Jaroslav and everyone, > > I have made the changes Jaroslav suggested and I cannot get Zope to > serve even 2 sessions simultaneously. > > In our testing, one client will start a query to the data servers. > Another will try to simply get the logon page to be served. Zope will > simply sit there and wait until the DB returns its results for the first > user before doing anything at all for the second. The 2nd user is not > hitting the DB server. The python script accessing the data is waiting > for the results for the first user. Could python be the problem? > > I am running python 2.4.4. > > Is it possible that I missed a flag or something when I build the Zope? > > Thanks for your suggestions so far, but I think I have missed a > fundamental setup step that allows zope to multithread sessions. > > If I were echoing what was being served to the clients, shouldn't I see > it interwoven? I don't, it is always (client 1's results) then (client > 2's results)... very atomic. > > Thanks again, > > Jon Emmons > > > > -----Original Message----- > From: Jaroslav Lukesh [mailto:[EMAIL PROTECTED] > Sent: Friday, May 23, 2008 9:37 AM > To: Jon Emmons; zope@zope.org > Subject: Re: [Zope] Multithreading sessions > > Hi Jon, > > I use 24 zserver-threads and I have here defined number of ZoDB > connections > (pool-size): > > in your instance etc/zope.conf look for that section: > > <zodb_db main> > # Main FileStorage database > <filestorage> > path $INSTANCE/var/Data.fs > </filestorage> > mount-point / > cache-size 1000 > pool-size 24 > </zodb_db> > > Please pay attention, if you have bunch of cache, your RAM shoul be > exhausted. > > Regards, JL. > > ----- Original Message ----- > From: "Jon Emmons" <[EMAIL PROTECTED]> > > >> I had already gone into zope.conf and added the line: >> >> zserver-threads 10 >> >> This seemed to have no effect. Is that what you mean? >> You think I should bump it higher? 100 maybe? > > _______________________________________________ > Zope maillist - Zope@zope.org > http://mail.zope.org/mailman/listinfo/zope > ** No cross posts or HTML encoding! ** > (Related lists - > http://mail.zope.org/mailman/listinfo/zope-announce > http://mail.zope.org/mailman/listinfo/zope-dev ) > _______________________________________________ > Zope maillist - Zope@zope.org > http://mail.zope.org/mailman/listinfo/zope > ** No cross posts or HTML encoding! ** > (Related lists - > http://mail.zope.org/mailman/listinfo/zope-announce > http://mail.zope.org/mailman/listinfo/zope-dev ) > -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFINvPgI2zpkmcEAhgRAgdwAKCAFmjuU93kwK/N9YG1rNFIsWF0vwCffP/D jii2wbhTczH9PhkD1VvdGYA= =vovu -----END PGP SIGNATURE----- _______________________________________________ Zope maillist - Zope@zope.org http://mail.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope-dev )