[cgl_discussion] [Timers evaluation/Validation] Notes from Ti mers eval team meetin g

Fleischer, Julie N julie.n.fleischer at intel.com
Wed Jan 22 13:50:42 PST 2003

> Craig Thomas wrote:
> I don't mean to make a joke of this (I am really serious), but how do
> you time a timer?  This will be a hard problem to solve.  Trying to
> determine if timers respond in an acceptable fashion under 
> heavy stress
> would mean that you need to make sure that they keep their time.  But
> how to you measure how they keep their time?  
> With another set of (non posix) timers, perhaps?

It's good that you bring this up.  My logic was (and feel free to point out
holes as some of it was just assumptions I didn't think about questioning

- For timers, they need to function relative to a clock.  Even if the clock
is off, if the timer expires at the correct time relative to that clock, I
would consider that correct behavior.  So, I can "time a timer" with the
clock used for the timer.

- For clocks, we'll have to use an external known-good clock somehow (Like
maybe run clock tests and compare time via NTP.).

- Julie

**These views are not necessarily those of my employer.**

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