AROS SMP Research: Technical Discussion

[NorthWay]

This reminds me of the BSD(?) Big Lock(?) discussion. All SMP stuff passed through a single lock and they did a lot of work to split the different parts into having their own lock.

First port of call is of course to drop Forbid/Permit use and go to using semaphores where possible, and perhaps find a lockless design.

IIRC I optimized my Exec patch to make semaphores assume success on first try and so not call Forbid if the semaphore was not held by someone else.

[NorthWay]

Getting accurate results can be difficult but itcould be profiled. At least how many calls to Forbid() or Disable() there are per minute...

I seem to remember some _old_tool that counted OS calls of your choice.
(When I say old I am thinking Fred Fish age.)