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An observation on glxgears performance
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An observation on glxgears performance

  • Subject: An observation on glxgears performance
  • From: Bryan Oakley <email@hidden>
  • Date: Fri, 10 Jan 2003 11:49:59 -0600
I just ran glxgears to see what my results are, and I find it interesting. For the record, I've got a dual 1 gig g4 with a gig of memory, a GeForce4 Ti graphics card, cinema display, and a CRT monitor (an old Dell at 1024x768).

When I run glxgears, I'm seeing very unusual performance numbers. For example, as I type in the mail app with glx fully visible on the other edge of the cinema display it is running at ~60fps. There's a several inch / several hundred pixel gap between the edge of the mail app and the edge of the glxgears window.

If I move the mail app so that the right edge is just a few pixels away from the left edge of glxgears I'm getting ~700fps. It's a real interesting effect. Seemingly, the main focus window doesn't have to be close, as long as some window of the focused app is close. In other words, I can move the window where I'm composing this message to my other display and glxgears continues doing close to 700ftp as long as one of my mail windows is within a half dozen pixels or so of the glxgears window.

This seems to be the case no matter what the focus window is -- a carbon app, a cocoa app, an X11 app. Whatever app has focus, if the edge of the app window is within a few pixels of the edge of glxgers, glxgears just flys. If not, it slows to a crawl.

The disappointing thing is, if glxgears is the foreground app it seems to be throttled back to 60fps. Though, if I drag it to my second display it seems to max out at ~150 fps. And to continue the oddness, if I move the foregound app (again, this mail window) next to the glxgears window on the other app, glxgears reports ~600 fps but it subjectively looks like about 2 (ie: it's very jerky).

So, I get wildly varying numbers that range from 60 fps to over 700 fps depending on what app has focus and where it is in relation to the glxgears window.
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