Sorry about not getting to this until after the release. I only recently (like, yesterday) got back to hacking after work hours after a multiple month hiatus.

--- On Thu, 9/2/10, Mark Proctor <mproctor@codehaus.org> wrote:

From: Mark Proctor <mproctor@codehaus.org>
Subject: Re: [rules-dev] FYI: Performance degradation from 5.0.1 to 5.1.0
To: rules-dev@lists.jboss.org
Date: Thursday, September 2, 2010, 9:51 PM
I think the attachment is missing, maybe use jira and attach it there?

Mark
On 03/09/2010 03:46, Greg Barton wrote:
I've observed a sizable (25%) performance degradation between the 5.0.1 and 5.1.0 releases. I've attached a sample project that tests the performance of matching nested objects. (ANd compares direct reference matching and the performance pitfalls of "from," but that's beside the current point.)

If you switch the pom.xml from using 5.0.1 to 5.1.0 for the drools dependencies you'll see 25% longer execution times on the tests. (mvn test)

Here's the test output:

5.0.1

reference.drl Count: 2000

reference.drl Time: 267ms

reference.drl Time per element: 0.1335ms

BAR Duplicates: 780

FOO Duplicates: 880

reference.drl Count: 20000

reference.drl Time: 1249ms

reference.drl Time per element: 0.06245ms

BAR Duplicates: 7702

FOO Duplicates: 8040

from.drl Count: 200

from.drl Time: 1139ms

from.drl Time per element: 5.695ms

BAR Duplicates: 112

FOO Duplicates: 102

reference.drl Count: 200

reference.drl Time: 5ms

reference.drl Time per element: 0.025ms

BAR Duplicates: 86

FOO Duplicates: 60

5.1.0

reference.drl Count: 2000

reference.drl Time: 300ms

reference.drl Time per element: 0.15ms

BAR Duplicates: 788

FOO Duplicates: 820

reference.drl Count: 20000

reference.drl Time: 1564ms

reference.drl Time per element: 0.0782ms

BAR Duplicates: 8142

FOO Duplicates: 7960

from.drl Count: 200

from.drl Time: 3543ms

from.drl Time per element: 17.715ms

BAR Duplicates: 68

FOO Duplicates: 90

reference.drl Count: 200

reference.drl Time: 13ms

reference.drl Time per element: 0.065ms

BAR Duplicates: 84

FOO Duplicates: 74

On the most taxing test (20k objects) 5.0.1 took 1249ms while 5.1.0 took 1564ms, and for larger tests the effect is more pronounced. This is primarily a test of == on object references.

GreG
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