[stringtemplate-interest] caching getter lookup speedup

[Sam Harwell]

Object property lookup (ASTExpr.RawGetObjectProperty) doesn't even appear on
the profiling reports for the C# port of ST3. Attribute lookup
(StringTemplate.GetAttribute) on the other hand is well over 50% of the time
spent inside StringTemplate.Write tested with rendering large grammars with
the C# port of ANTLR. That optimization should result in a substantial
overall performance improvement. :)

Sam

-----Original Message-----
From: stringtemplate-interest-bounces at antlr.org
[mailto:stringtemplate-interest-bounces at antlr.org] On Behalf Of Terence Parr
Sent: Sunday, December 26, 2010 1:59 PM
To: stringtemplate-interest at antlr.org List
Subject: [stringtemplate-interest] caching getter lookup speedup

ok, added benchmarking code to v4.  Tested speed with and w/o Method/Field
caching.  about 10x improvement.  Average units of work went from 32.77 to
395.22. This is a micro benchmark for property lookup.

timeSimplePropsOfArgs  :   395.24  402.13  399.98  369.82  408.94 =   395.22
units of work / ms

timeSimplePropsOfArgs  :    32.63   32.74   32.68   32.95   32.83 =    32.77
units of work / ms

Now I'm optimizing local attribute (arg) access.  Sam Harwell will be happy
:)  I'll check those numbers after impl.

Ter
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