OpenEuphoria

RE: delay loop

• Posted by kbochert at ix.netcom.com May 18, 2002
• 406 views

-------Phoenix-Boundary-07081998-

Some thoughts (guesses) on delay ---

  procedure soft_delay()
     for i =3D 1 to 2 + abs(tick/2400) do
        z=3Dpower(56.982,7.3)/i
     end for
  end procedure

The execution time  of this procedure is highly
dependant on caching. Does the  entire loop fit
in the cache=3F How big is the cache and how many
ways does it have=3F This interacts strongly with
the multitasking characteristics of  the system
(other tasks compete for cache space).

The best results would probably be had by:

Keep the code in soft_delay() as short as possible.
The longer it gets, the more likely it is to
sometimes execute from cache and sometimes not.

Calibrate the length of the loop needed by direct
comparison with timer(). Pass the loop length as a
parameter to soft_delay(), and count how big a loop
is needed to equal 1 second. This insures that the
calibration and use of the delay are as similar as
possible.

Turning off caching while soft_delay() executes may
help (just don't ask me how!).


Karl Bochert


-------Phoenix-Boundary-07081998---