Enable CSE in McLachlan

Comments (4)

1. 

   Frank Löffler

   • removed comment

   What out of http://en.wikipedia.org/wiki/CSE is the CSE you mean? :)

   • 2011-08-26T13:36:57+00:00
2. 

   Erik Schnetter reporter

   • removed comment

   The one activated by the UseCSE->True flag, <http://en.wikipedia.org/wiki/Common_subexpression_elimination>.

   • 2011-08-26T13:38:08+00:00
3. 

   Ian Hinder

   • removed comment

   Does CSE lead to improved performance on some systems? I believe Barry found that it gave improvements for !WeylScal4 but not for !McLachlan, but I might be misremembering.

   • 2011-08-26T15:31:00+00:00
4. 

   Barry Wardell

   • removed comment

   Yes, when I was testing it, I found that it actually slowed !McLachlan down a bit, but did give a speedup for !WeylScal4. This was before a lot of the recent speed improvements in !McLachlan so it would be worth checking again. I don't think we should just blindly enable it, though.

   The benefits of CSE might also depend on e.g. whether Jacobians are enabled or not, how aggressive the CSE is (this can be tuned), etc.

   • 2011-08-28T15:51:27+00:00
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