[rules-dev] FYI: Performance degradation from 5.0.1 to 5.1.0

[Edson Tirelli]

   Greg,

   Can you check 5.1.1 instead? There was a problem in 5.1.0 that caused
indexes to be disabled in certain situations and also a bug on "exists". In
general, we had the opposite feedback: reduction of memory usage and
performance increase due to reduced GC overhead.

   Edson

2010/9/2 Greg Barton <greg_barton at yahoo.com>

> 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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>


-- 
  Edson Tirelli
  JBoss Drools Core Development
  JBoss by Red Hat @ www.jboss.com
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