Re: [TCLCORE] TIP #375: Symmetric Coroutines and Yieldto

[miguel s. <mig...@gm...>]

On 08/27/2010 06:41 PM, Neil Madden wrote:
> <snip>  The one drawback is
> that coroutine context switches are quite slow at present. Definitely an
> area for optimisation prior to 8.6 final.

Do you havr evidence for that?

I never measured, but:
   * a yield should be a tad slower than a return (return is bc'ed, 
yield is not)
   * a resume should be in the same order of magnitude as a proc call, 
slighty faster
   * a yieldto is indeed likely to be a bit slow: not bc'ed, a bit of 
callback stack juggling. It is probably slower than a proc call, but a 
big part of the difference should be recovered at the end: yieldto 
causes the caller's stack data to be cleaned up earlier, but it will 
eventually have to be cleaned up anyway.