On 10/20/09, Alexandre Ferrieux <alexandre.ferrieux@[...].com>  wrote:
>  Hello,
> 
>   I have now updated the patch for TIP #348 (errorStack) at
> 
>   https://sourceforge.net/tracker/index.php?func=detail&aid=2868499&group_id=10894&atid=310
894
> 
>   to comply with Joe's suggestions [info errorstack ?interp?] + [dict
>   get $d -errorstack].
> 
>   Please review the performance measurements there (and code).
> 
>   TIA,
> 
>   -Alex
> 

Patch extended to allow measurement of the faster construction of
errorstack as a flat list.
Timing results at the same place:

https://sourceforge.net/tracker/index.php?func=detail&aid=2868499&group_id=10894&atid=310894

Also, an I tried the Lisp-like linked list approach (each cell being a
Tcl_Obj), only to discover that it didn't gain any speed. So the final
choice is the following:

     (1) [use==2]: [info errorstack] + options dicts + nested list, <5% slowdown

     (2a) [use==6]: [info errorstack] + options dicts + flat list, <2% slowdown

     (2b) [use==6]: [info errorstack] + postprocessed nested list, <2% slowdown

I am hereby asking you to argue on this choice, even if you don't have
time to review the code.

-Alex

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