Is the equality comparison using "==" or "equals"? -Russ -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ernest Friedman-Hill Sent: Friday, August 29, 2008 2:26 PM To: jess-users Subject: Re: JESS: Performance question
On Aug 29, 2008, at 12:58 PM, [EMAIL PROTECTED] wrote: > The performance of the second version is much slower, especially as > the number of facts increases. Is this just the overhead of my > function call vs. "equals". Does anyone have suggestions about > possible restructuring of the problem that might minimize the calls > necessary?. For an equality comparison, Jess can use the hashcodes of the tested values to sort the facts into bins, and then actually do the comparison on only a comparatively small fraction of th facts. This is a big win. For a function, though, Jess has to do *all* the comparisons, since it doesn't know how to organize the data to eliminate any. > > As a side note, I'm noticing that the performance of Jess7.1p1 is > slower than 70p2. I was expecting a performance increase because > of the use of the "test" CE but that doesn't seem to be making a > difference. Jess 7.1 has a lot of different optimizations, some for speed, some for space, and there's always a tradeoff between these two. Some programs do run faster (some *much* faster), while others might run a little slower. If you're seeing a nontrivial slowdown, though, I'd be interested in hearing the details. --------------------------------------------------------- Ernest Friedman-Hill Informatics & Decision Sciences, Sandia National Laboratories PO Box 969, MS 9012, Livermore, CA 94550 http://www.jessrules.com -------------------------------------------------------------------- To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED] -------------------------------------------------------------------- -------------------------------------------------------------------- To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED] --------------------------------------------------------------------
