[Haskell-cafe] Re[2]: Joels Time Leak

Bulat Ziganshin bulatz at HotPOP.com
Thu Jan 5 18:49:11 EST 2006

Hello Simon,

Thursday, January 05, 2006, 3:40:27 PM, you wrote:
>>>>SM> Sure, there's no reason why we couldn't do this.  Of course, even
>>>>SM> idle Haskell processes will be ticking away in the background, so
>>>>SM> there's a reason not to make the interval too short.  What do  
>>>>SM> you think is reasonable?

SM> It will have an impact, because the tick signal has to be delivered to 
SM> the process and the signal handler run.

you are saying about C callback which would be called by OS to count

SM> The impact on CPU time is 
SM> small, but could be noticeable if we were to choose too small an 
SM> interval.  Furthermore, the ticker prevents idle Haskell processes from 
SM> being completely swapped out (that problem already exists).

having ticks of 0.02 sec or 0.000002 sec doesn't change anything for
this problem

i think that reasonable tick would be in range of 10-100 microseconds,
so what program with 10k threads (reasonable maximum with current
technologies state) can give slice to each thread in 0.1-1 seconds

Best regards,
 Bulat                            mailto:bulatz at HotPOP.com

More information about the Haskell-Cafe mailing list