Hello everybody,
first of all: I have read the post "VirtualGL performance impact" [1] and also
seen the conclusion that benchmarking is a "lost cause".
However, this case is somewhat different. I do not (well, not really) care about
theoretical details or performance impact. I simply want to be able to compare
multiple different remote graphics solutions, i.e. which product is capable of
delivering best performance (in FPS) to the end user. As these tests should be
done under different network conditions, I'd like to automate them as far as
possible (bash scripts, etc).
For the beginning I decided to try VirtualGL as it comes with a few tools for
that (glxspheres64, tcbench, ...). However, I'm having some trouble in
understanding and using these tools -- and maybe the whole thing.
My testing environment consists of two computers ("server" and "client")
connected via gigabit LAN. Setting up VirtualGL and TurboVNC was straight
forward and is up and running. Both are running on CentOS 6.2 and the latest
versions of VGL (2.3) and TVNC (1.0.90).
glxspheres:
When I remotely run glxspheres it shows very "random" fps numbers. Random in a
sense that it sometimes represents what really is shown via VNC (e.g. about 3.x
FPS with reduced network throughput) and sometime a much higher value under same
network conditions (probably the number of frames that are rally being rendered
on the hardware). I have not yet found a way to enforce giving the first values,
which I'd be more interested in. *Sometimes* it *seems* to be that after
changing the display options of the VNC Viewer (especially when switching to
"Lossless Tight") the values tend to represent the displayed FPS.
What is the intended behavior here and/or how do I get the number of FPS that
are seen in VNC? If possible at all.
tcbench:
As the FPS glxspheres aren't "usable" (at least not by me), I wanted to use
tcbench. Unfortunately, it sometimes (~95% of the cases?) ignores all parameters
such as sample rate or benchmark runtime. Just starting it two times in a row
and this might occur. I tried tcbench of different versions, everytime the same.
Secondly, I did not find a way to automatically select a window to be
benchmarked. As stated above, I'd like to automate it as much as possible.
Manually selecting windows isn't exactly what I wish ;)
If you have any other spontaneous idea on how to set up a benchmark course, I'd
happily listen to all suggestions :)
Thanks in advance
Florian
[1] http://comments.gmane.org/gmane.comp.video.opengl.virtualgl.user/712
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