Quoting Miller:
Should theoretically work on Mac too, but I don't have any 2+-processor mac to try it on. Probably does nothing on windows.
In Windows XP SP3, 32 bit, using the following puredata:
D:\XP32\Program Files\pd\bin>pd -version Pd version 0.41-4extended compiled 03:33:30 Jun 4 2009
The -nosleep fills one CPU entirely. So seems to be working. The system is the same I've reported above for Ubuntu 9.10.