nanogui: Thread: pre89 slow X11

Hi,

the X11-Version of the new pre89 release is very slow at screen-updates.
After commenting out the XSynchronize() in drivers/scr_x11 it has the speed
known from the pre-Releases.

I really dont know what the XSychronize() is good for, I dont experience any
problems without it. Maybe it would only be needed when using threads (I
have just many seperate client-processes writing to the nanox-server)?

chris

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> the X11-Version of the new pre89 release is very slow at screen-updates.
> After commenting out the XSynchronize() in drivers/scr_x11 it has the
speed
> known from the pre-Releases.

Yes - I added the XSynchronize call from a patch stating that
it was required for screen results to be exact.  I haven't seen
incorrect screen results, and don't know the sample program
used when they happened.



> I really dont know what the XSychronize() is good for, I dont experience
any
> problems without it. Maybe it would only be needed when using threads (I
> have just many seperate client-processes writing to the nanox-server)?

If threads are used, the new config option THREADSAFE=Y should
be used.

I would suggest commenting out XSynchronize in src/drivers/scr_x11.c
for now.  I'm currently adding some other large patches that
enhance the speed in the X11 screen driver significantly; as well,
I'm going to tackle the internal image-handling code, and restructure
it so that blits can be used.  This will greatly speed up most X11
screen output.  (you can tell I've done all my development on
the framebuffer itself...)

Regards,

Greg




>
> chris
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