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

[Greg Barton]

Oops!  It's attached, and https://jira.jboss.org/browse/JBRULES-2685
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 at codehaus.org> wrote:

From: Mark Proctor <mproctor at codehaus.org>
Subject: Re: [rules-dev] FYI: Performance degradation from 5.0.1 to 5.1.0
To: rules-dev at 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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