Re: [Gems-users] regd. event queue

["Dave Z." <zhu_dave@xxxxxxxxx>]

Thank you for your prompt reply, Dan! 

I have a few more questions regarding the magic
instructions/callbacks.

How can I find out the number of Ruby_cycles
introduced by magic instructions? Is it the number of
I-fetches?

My magic instructions/callbacks start execution of
some components I've added to Ruby. Is it possible
that there are extra Ruby_cycles observed due to the
start of components?

Thank you,

Dave
   

--- Dan Gibson <degibson@xxxxxxxx> wrote:

> Simultaneous was the implementation goal for
> same-cycle events -- but 
> since Ruby is implemented sequentially the events,
> of course, actually 
> execute sequentially. Events in the "same cycle" are
> technically 
> unordered, though in practice they are ordered by
> the implementation of 
> the priority heap used by EventQueue.[Ch].
> 
> Adding magic instructions and/or callbacks will
> affect the number of 
> observed Ruby_cycles, in the following ways:
> 1) Addition of a sethi instruction (eg. magic call)
> changes the 
> execution path ( a sethi takes at least a cycle to
> execute, after all), 
> i-cache behaviour, etc., and could (very rarely)
> cause more interesting 
> effects (eg. perhaps by adding sethi instructions a
> particular 
> PC-relative branch path becomes impossible to
> express).
> 2) Magic instructions/callbacks definitely can
> impact the behaviour of 
> Ruby (depending on what your code does in response
> to them), which can 
> in turn affect the observed cycle count.
> 3) Rarely, as a corollary of #1, addition of
> instructions can affect 
> entire dynamic executions due to changes in the
> order of synchronization 
> events.
> 
> Regards,
> Dan
> 
> Dave Z. wrote:
> > Hello,
> >
> > Does the event queue trigger simultaneous events?
> Or
> > everything takes place sequentially?
> >
> > Would the addition of magic instructions and
> callbacks
> > increase Ruby cycles?
> >
> > Thanks,
> >
> > Dave
> >
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