-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Dario Lopez-Kästen wrote:
<snip> > Let me be the first to admit my total lack of knowledge of kernel task > schedulers, but generally speaking, unless the scheduler makes sure that > a threaded python process never ever gets distributed over two > processors simultaniously, then the GIL *will* be an issue. The hypothesis is that the scheduler "notices" that threads in a single Python process are always blocking on a single kernel resource (the semaphore / mutex which is the GIL), and hence migrates them all to the same CPU (over time). I could imagine that this is like the "hand-rolled assembly vs. compiler-generated code" case: older kernels (like the one your old app was dpeloyed atop, perhaps?) didn't have such smarts, but newsr ones do. > In any event, I'd love to be proved wrong about the need for taskset > (especially if someone comes up with measurable data to that effect) > because it means that my sysadmins can simplify their setup for managing > Zope (making Zope even more acceptable :-). WHile at ZC, one of the other engineers and I did some testing on SMB boxes, and found that "one appserver per CPU" gave us near linear scaling of the application, without any explicit affinity set. I don't have the numbers (we were using stock Dell 1U dual CPU boxes, I think), but the win seemed clear enough that we quit invesigating taskset. Tres. - -- =================================================================== Tres Seaver +1 202-558-7113 [EMAIL PROTECTED] Palladion Software "Excellence by Design" http://palladion.com -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.1 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org iD8DBQFEIVAK+gerLs4ltQ4RAnb9AKC7qw38+BqNdAbY79bqPR4/G7USCwCbBmit UX+GcftjNQ5fUKajALsEbSk= =+E5c -----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 )
