lkml.org 
[lkml]   [2003]   [Sep]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: [PATCH] schedstat-2.6.0-test5-A1 measuring process scheduling latency
>>>>> "Rick" == Rick Lindsley <ricklind@us.ibm.com> writes:

PeterC> An alternative is my microstate accounting patch, which lets
PeterC> you do the same thing (with rather less intrusiveness) but
PeterC> per-thread.

Rick> [ ... snip ... ]

PeterC> My own observations tend me to the idea that a process
PeterC> waiting for disk I/O isn't awoken fast enough, at least on my
PeterC> laptop.

Rick> I'm not sure that it's any less or more intrusive, but it's at
Rick> least another way of doing the same thing. So since you've
Rick> taken some measurements, what's the length of time you find your
Rick> process waits to hit the processor after getting the I/O it
Rick> needs? What's the time it seems to wait when it skips (what's
Rick> the cutoff at which you hear a skip versus don't hear one?)


Graph attached, times in seconds per second.
(BTW, the patch I sent was bad, because I diffed against the wrong
tree. There's a new patch coming soon)


[image]
\
 
 \ /
  Last update: 2005-03-22 13:48    [W:0.076 / U:0.216 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site