lkml.org 
[lkml]   [2000]   [Oct]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: kqueue microbenchmark resul
> >In fact, if you did leave the read queued in a daemon using select() 
> >before, you'd keep looping endlessly taking all CPU and never idle
> >because there would always be read data available.

That would be a programming error on the part of the application.
Any application using a level-triggered interface like select
or poll must of course mask off events it is not interested in,
to avoid getting them endlessly. That's just 'select 101'.

> Also, level triggered notifications would also seem to cause
> multiple thread wakeups and thundering herd problems when
> there are multiple worker threads reading from the same queue.
>
> How does (?) kevent avoid this from happening?

Easy - applications which have multiple threads reading from the
same queue would use oneshot events instead of level-triggered events.
Level-triggered events are only for applications where a single thread
is reading from the queue.

- Dan
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 12:45    [W:0.018 / U:34.444 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site