On Wed, 2006-03-22 at 08:24 -0500, Tres Seaver wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1
> > 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. > The other engineer was me, and it was close enough to double the load per instance, per cpu. If he needs to test it, the numbers are easy to get. Run a single instance on a SMP Server, and hit it with load. You will get Y. Run another instance and spread that load across both instances and you will get nearly 2xY. Take a single cpu server and run 1 instance and load test it, and you'll get Y. Take that same single cpu server and run 2 instance, and load test it across both instances, and you'll get Y. These tests were done on both Linux and FreeBSD and both were approximately the same. The conclusion was, no further complexity is required to get a substantial performance benfit by running SMP Servers with multiple Zeo Clients instances, where the # of CPUS == the # of Zeo Client instances. This has been posted to the lists serveral times BTW. The only snafu is to make sure you have enough RAM to run several zeo client instances. If you've got a 4way server, I'd recommend 16GBs of RAM if it's a big site. I personally like to put as much ram into a server as it can physically handle. Andrew Sawyers > > 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 ) _______________________________________________ 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 )