Speed of Krita 2.4

[Sven Langkamp]

On Tue, Aug 2, 2011 at 5:09 PM, Sven Langkamp <sven.langkamp at gmail.com>wrote:

> On Mon, Aug 1, 2011 at 11:42 PM, Sven Langkamp <sven.langkamp at gmail.com>wrote:
>
>> On Sat, Jul 30, 2011 at 11:41 AM, Silvio Heinrich <plassy at web.de> wrote:
>>
>>> Am 29.07.2011 23:30, schrieb JL VT:
>>> > I don't know how fast Krita is in the other branches (I haven't tested)
>>> > however I'd like to ask if there's a good date to start feeling really
>>> > worried about speed?, I don't want 2.4 to be a single bit slower than
>>> > 2.3, so I'd like to start hacking to try to find where our current
>>> > bottlenecks are; but I don't know which parts deep in Krita to touch
>>> > without stepping on other developer's toes, moreover, my fears may be
>>> > unfounded, maybe we're just a couple weeks shy of a branch merge
>>> solving
>>> > all these problems, but, again, I haven't kept up enough with our IRC
>>> > backlogs and Krita branches to be sure.
>>> >
>>> > Should I be worried?.
>>> >
>>> > Is there an upcoming branch I should be testing to help with the speed
>>> > bottlenecks instead?.
>>> >
>>>
>>> As far as I know we have two big bottle necks.
>>> The first is the creation and transformation (rotation, scaling) of the
>>> brush masks. The last time I profiled krita it spent 20-30% (I can't
>>> remember exactly anymore) of the whole processing time while painting
>>> with this operations.
>>>
>>
>>
>> Depends on which brush is used. Autobrush shows about 30% of the time in
>> processing the mask, but it's not using 100% cpu. I think there is another
>> bottleneck that callgrind doesn't show. Painting with predefined brushes
>> shows a big performance bottleneck in scaling the brush (callgrind file:
>> http://depot.tu-dortmund.de/get/syvg6 ) in the stroke benchmark. There is
>> a single method that takes most of the time, so that should be the first
>> target when trying to speed up things.
>>
>
> I have attached a patch that turns off interpolation. It should give about
> double the performance when painting with predefined brushes. Can the
> artists here check how big the impact on quality is?
>

As first tested showed that it my patch also reduces some artifacts too, I
have commited it. Please check out if it's ok. If not I will revert it.
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