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Re: Repair move is slow and could be more intelligent

From: Robert Roessler <robertr_at_rftp.com>
Date: Sat, 25 Apr 2009 10:13:41 -0700

Stefan Küng wrote:
> Robert Roessler wrote:
>> Stefan Küng wrote:
>>> webpost_at_tigris.org wrote:
>>>>> webpost_at_tigris.org wrote:
>>>>>>> Alexander Iljin wrote:
>>>> ...
>>>> Not quite sure how you are sorting 15000 items that slow? On my
>>>> machine, sorting 15000 items of a decent size (300 bytes) takes less
>>>> than ½ sec in a completely un-optimized program and about half if I
>>>> sort the pointers to the objects only.
>>> It's not the sorting that takes so much time. But after sorting the list
>>> control must be filled again, and that takes more time than the actual
>>> sorting.
>>
>> Obviously everyone knows about turning off redraw while filling a
>> large[r] list control, but I have also had good results with "owner
>> DATA" (not owner DRAW, different issue).
>>
>> With owner DATA, the control doesn't store all of the data itself - the
>> owner just gets sent a message whenever the data for a particular item
>> needs to be displayed.
>>
>> This can work especially well with large numbers of items, both because
>> the control's own heavyweight storage mechanisms are not being used, but
>> also if one has list items that can easily be generated/synthesized on
>> demand, then NO ONE has to allocate the storage. ;)
>>
>
> There's no need to lecture me about the list control. Owner data is used
> in the log dialog and some other dialogs in TSVN that use the list control.
> And of course turning off redrawing is done too.
>
> The only reason why there's no owner-data used in the status list
> control (that's used in the commit dialog) is that it's a lot of work,
> and for most working copies wouldn't gain any speed improvements. Just
> as an example, my wc of the TSVN source with all the externals currently
> shows a size of 5GB in 30'000 files (that's of course including all the
> .svn folders and its content). And sorting/filling the list control
> takes half a second on my machine (which is not very fast).
>
> However, if you want to contribute more than lectures, feel free to
> provide a patch.

Chill, Stefan - that wasn't a "lecture", and was not in any case
targeted at you... at most, it is an educational tidbit for those
discovering this thread in some future search.

-- 
Robert Roessler
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Received on 2009-04-25 19:15:17 CEST

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