[R-SIG-Mac] performance difference GUI vs. terminal

[Simon Urbanek]

On May 19, 2005, at 11:50 AM, stefano iacus wrote:

> could we add a pref checkbox? Like "Give cpu time to other  
> processes during R calculations" yes/no which disables/enables  
> R_ProcessEvent calls in eval().

I don't think we need it anymore, because R_ProcessEvents simply  
checks how much time elapsed since it ran the system loop and if it's  
less that a given time, it will just return (more precisely it  
doesn't even bother calling the REngine callback). Currently I set  
the threshold to 150ms which seems reasonable to me - i.e. the  
longest response time to a system event (except for signals) is a bit  
over 150ms.

We could make the window configurable, but I don't think making it  
bigger will have significant impact on the performance. I could make  
it even adaptive such that the window will increase during long  
periods of R activity, but again, I don't think it's really necessary  
(unless, of course, someone provides an example where it would make a  
difference).

Cheers,
Simon