It does on my windows xp install, if its a simple opengl app.
basically its looping like this
while(1)
{
//Some code
}
which if you've ever done programming you would know put cpu utilization
at 100% and possibly makes the system unresponsive.
A quick way to test this is to put
"while true; do echo "loop"; done;"
In your terminal, and watch the cpu utilization go through the roof. Just
remember to close the console after or everything will feel a bit slow if your
not on a multithreaded system.
But a lot applications use the sleep/usleep command, which puts process to
sleep for awhile. Lets other applications at the cpu, which makes the system
much more responsive, and lowers the CPU utilization.
--
OpenGL uses 100% CPU without Sync To VBlank
https://bugs.launchpad.net/bugs/139107
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