[Xcb] xlib versus xcb performance in Qt Applications?
jamey at minilop.net
Sat Mar 31 08:33:29 PDT 2012
On 3/31/12, Rick Stockton <rickstockton at reno-computerhelp.com> wrote:
> On 03/30/2012 07:39 PM, Jeremy Huddleston wrote:
>> On Mar 30, 2012, at 5:41 PM, Rick
>> Stockton<rickstockton at reno-computerhelp.com> wrote:
>>> And BTW, we've removed xlib support in Qt5, switching to xcb on X11
>>> platforms. :)
I'm super excited to hear that. :-)
> So, what kinds of things would you like me to compare? I've got a
> example Apps with flying things; one which plays a short movie; and
> various other examples of "Painting Goodness". Can I assume that input
> (keyboard, mouse) doesn't need testing, because input events from xcb
> are 1:1 with events from Xlib? Or should I cover some input events too?
XCB has a 4kB receive buffer, but Xlib doesn't buffer input. So it's
possible that under very heavy event load, XCB might do better. My
guess is it won't make a measurable difference, but it would be
interesting to find out.
I look forward to seeing your results!
BTW, how did you guys handle keyboard input? We haven't provided very
good help for that yet, that I'm aware of.
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