Re: [TCLCORE] Agressive shimmering

On Feb 5, 2013, at 5:42 AM, Jan Nijtmans wrote:

> 2013/1/29 Jan Nijtmans <jan....@gmail.com>:>> What I'm examining is some simple improvements which diminish>> the shimmering as reported by Brian without sacrificing binary>> compatibility (if possible) . This whole discussion is useful, because>> many people in this group have past experience why and how Tcl>> became how it is now. The best way to try things out is simply>> committing a proposal to a separate branch (which is cheap in>> fossil) and allow people to run their own benchmarks. If it>> doesn't give an improvement, throwing it away is easy as well.> > The "no-shimmer-string-length" is fully operational now, all test-cases> pass (even cmdIL-1.29!). Below is a simple example, which used to> shimmer between dict and string representation, with this change it> doesn't shimmer any more. The speed-up is from around 2 microseconds> per iteration to 0.5 microseconds per iteration.> > Brian, this should make significant difference in your benchmarks,> does it? All objTypes are fully compatible: the only change is that> internalRep.twoPtrValue.ptr2 is used now while it was not used> before. Therefore it would not be a problem even to put it in Tcl 8.5.

Thanks Jan!  I'll take a look at this once I get past my current project.

-Brian

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