Comments on the KSE option

[Daniel Eischen]

On Sat, 28 Oct 2006, Scott Long wrote:

> Daniel Eischen wrote:
>> Actually, that's not quite true.  I assume you know the thing you
>> left out:  system scope threads compete against all the other
>> system scope threads in the system (from all applications, not
>> just within one application).
>> 
>
> All this debate about the merits of process scope threads and fair
> scheduling is great.  But tell me, who was working on making this stuff
> work well quickly and reliably (i.e. work well)?  No one!  I don't care
> what AIX or Solaris or what else may or may not have done, who was making 
> this work well for FreeBSD?  Having a slow a thread subsystem is
> a serious detriment, no matter how nice and flexible it looks on paper.

Process scope threads work well in libpthread.  System scope
threads work well and fast in libthr.  I think most people's
concept of "fast" as applied to process scope threads doesn't
quite mesh well with the fact that process scheduling is fair.

-- 
DE