Re: Slow XQueryPointer?
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Hi @Alan: > You don't have to convert the entire app to XCB to be able to use it for > just one or two calls, for example, most of xdpyinfo uses libX11 calls > still, but the loop to list extensions uses xcb to be able to send all > the queries and then wait for all the responses instead of doing a > blocking call for every single extension: Yes, but then I'd depend on libxcb (or have to dive into dlopen and friends). > Simplest thing (although kind of hideous) might be to launch another > thread with its own Display connection and only ever run XQueryPointer > from that, save the coordinates in some shared variable protected by a > mutex, and read from that in the main thread. Or in a separate process > over a pipe, if you don't like threads. > > I don't really know what you need the result for, though, so I don't > know if that's a viable technique for you. It's used once per frame for 3d movement (yeh, game). A thread might work. Attaching a bench app I've used in tracking this down. Run it with some apps open (browser, IRC client, some terminals...) and watch the max number. Perhaps it'll help, I don't remember how long running a x11perf test took. -- - Lauri
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