On 13/10/2015 15:33, Richard Gaskin wrote:
Peter TB Brett wrote:
> On 13/10/2015 14:42, hh wrote:
>> There is an interesting difference between LC versions 6 and 7.
>>...
>> [a] LC 6.7.7
>> repeat-PMB 0.326 <- fastest
>> repeat-GC 0.350
>> repeat-hh 0.445
>> sort-GC 0.985
>>
>> [b] LC 7.1.0
>> repeat-PMB 3.562
>> repeat-GC 1.483 <- fastest, the only one with a factor < 9
>> repeat-hh 1163.0 <- an ARRAY BUG? :-(
>> sort-GC 8.156
>
> There's no array bug -- it's an aspect of its intentional behaviour.
> Appending to an element of an array always causes a copy, so you get
> O(N^2) complexity.
Thanks for the background, Peter, but what accounts for the difference
between version (v6 @ 0.445ms vs v7 @ 1163.0ms)?
I don't know anything about the way arrays are implemented in LiveCode
6.x, so I can't tell you how they've changed.
> Please re-test in LiveCode 8.0.0-dp-7, because there are some large
> performance optimisations in that release that may affect these
> results.
Being part of LiveCode Script and not specific to Builder, will these
changes also be in v7.x?
The changes will be in 7.1.1-rc-1.
Peter
--
Dr Peter Brett <peter.br...@livecode.com>
LiveCode Open Source Team
LiveCode on reddit: https://reddit.com/r/livecode
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