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

[Mark Proctor]

  Thanks we'll look into it, now if you only gave that to us before 5.1 
final ;)

In general we've had some great performance improvements on systems with 
large number of facts due to "differential update".

Will be interesting to see where this slow down point is.

Thanks

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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