Window content update benchmark (code review)

[Yann Droneaud]

Hi,

Here is some code for reviews.

This program tries to benchmark window update using X11 + extensions
requests. The program uses Xlib functions such as XPutImage(),
XCopyArea(), XRender function XRenderComposite(), Pixmap, MIT-SHM shared
memory, shared memory Pixmap, etc.

The purpose of the program is to show how ARGB32 visual, composite
manager, drivers and shared memory interact between each others on
different hardware/driver configuration.

Running this program on different system configuration will show that
hardware and driver configuration (for example a nvidia card with X.org
driver vs proprietary driver) affect window update performance, which is
especially true regarding shared memory pixmap.

BTW, I'm sure I made some mistake and forgot some efficient/clever ways
of updating window content. Feel free to comment/improve this little
program.

Example, running on 855GM adapter, using intel_drv version 2.4.2
  Composite: 0.4
  Render: 0.10
  MIT-SHM: 1.1
  event 19
  Can't set priority, harmless: Permission denied
  Can't set scheduler, harmless: Operation not permitted
  Can't lock memory, harmless: Cannot allocate memory
  event 15
  event 12
  1: XPutImage(XImage): 6.842764797
  2: XPutImage(XImage): Pixmap, XCopyArea(Pixmap): 10.318757087
  3: XPutImage(XImage): Pixmap, XRenderComposite(Pixmap): 10.241974700
  4: XShmPutImage(XImage SHM): 4.224114416
  5: XShmPutImage(XImage SHM): Pixmap, XCopyArea(Pixmap): 6.694422568
  6: XShmPutImage(XImage SHM): Pixmap, XRenderComposite(Pixmap):
6.575778511
  7: XCopyArea(Pixmap SHM): 3.993095927
  8: XRenderComposite(Pixmap SHM): 3.805270309


Regards

-- 
Yann Droneaud

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