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Is there a free and small tool which can monitor the FPS my OS/PC is running at?

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FPS can be only measured in games for example. In the OS you get a lot (can't be measured), if you enable VSync you get exactly the hertz you set. (Like 60/70/85).

People only measure FPS in games, 3D applications usually. For that, you can use FRAPS or Xfire (the latter is only for games, the first one works with any 3d/opengl app IIRC).

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For the specified purpose, under Windows, FRAPS is technically free and it gives you the Aero desktop rendering FPS count. If you want to do things beyond watching the FPS counter, then you'll want the full version.

This is actually useful diagnostic information and it helped me to prove that I wasn't crazy: There's an issue in my Windows 7 Nvidia system that results in the desktop Aero rendering rate to sometimes dropping so that things visibly jerk or lag. (Anyone having this problem, try stop and restarting both themes and uxsms services - the problem magically disappears for another random amount of time)

OT edit: If you want to actually record directx game video, a ?chinese? tool called dxtory is likely better choice than FRAPS, giving out visibly smoother video. Not free either.

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Try FurMark.

EDIT:

If you're concerned about gaming, tools may not give accurate "readings" of your fps. The best way is to download a videogame that show your FPS and try it (Urban Terror works). I've noticed that games in fullscreen work better than in "windowed mode".

Good luck!

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FurMark is a video card benchmark. It'll just measure how much juice you can get out from your vga. UrbanTerror is again, kinda like a benchmark will show how much your PC can produce INSIDE the game. – Shiki Apr 4 '10 at 15:34
@Fujishiro - Well, Urban Terror will get you as close to the real operating conditions as possible. Which is the point, no? – Moshe Apr 4 '10 at 15:56
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I thought he wants to measure the FPS of a given stuff. For example his desktop. That is impossible. UrbanTerror will just give a shot about how his PC will render the ioQuake3 based game on X resolution. Which is not the "running fps". (No offense, but I think there is no possible answer for this question since its just way too .. strange? ^^") – Shiki Apr 4 '10 at 16:02
@Fuji - A strange question deserves a strange answer. – Moshe Apr 4 '10 at 16:43
Well, he got two I guess. :) – Shiki Apr 4 '10 at 17:34
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up vote 0 down vote

If you are using Windows Vista/7 AND you want to know how well the DWM (Desktop Window Manager) is performing, then you could just lookup the PC's performance rating.

Pay special attention to the graphics section.

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