Re: Swap performance statistics in 2.6 -- which /proc file has it?

["Richard B. Johnson" <root@chaos.analogic.com>]

On Tue, 9 Dec 2003, Dominik Kubla wrote:

> Richard B. Johnson wrote:
> > If you need statistics v.s. time, you need to write an application
> > that samples things at some fixed interval. In a previous life,
> > I requested that "nr_free_pages()" be accessible from user-space,
> > probably via /proc. That's all you need. Maybe that could be
> > added now?  In any event, samping free pages at some fixed-time
> > interval should give you all the information you need.
>
> vmstat -a
> sar -B
> sar -r
>
> O'Reilly's "System Performance Tuning" might make for an interesting read,
> especially pages 110ff (also its Linux informations are a bit out of date).
>
> Regards,
>    Dominik Kubla

Hmm. I was talking about real stuff, not some theory.....

Script started on Tue Dec  9 15:19:25 2003
# vmstat -a
usage: vmstat [-V] [-n] [delay [count]]
              -V prints version.
              -n causes the headers not to be reprinted regularly.
              delay is the delay between updates in seconds.
              count is the number of updates.
# sar -B
bash: sar: command not found
# sar -r
bash: sar: command not found
# exit
exit
Script done on Tue Dec  9 15:20:03 2003

Maybe it was a different system???

Script started on Tue Dec  9 15:21:24 2003
# rlogin hal
Password:
Last login: Tue Oct 28 12:00:38 on console
Sun Microsystems Inc.	SunOS 5.5.1	Generic	May 1996
# vmstat -a
Usage: vmstat [-cisS] [disk ...] [interval [count]]
# sar -B
sar: illegal option -- B
usage: sar [-ubdycwaqvmpgrkA][-o file] t [n]
	sar [-ubdycwaqvmpgrkA][-s hh:mm][-e hh:mm][-i ss][-f file]
# sar -r
sar: can't open /var/adm/sa/sa09
No such file or directory
# uname -a
SunOS hal 5.5.1 Generic sun4m sparc SUNW,SPARCstation-5
# exit
rlogin: connection closed.
# exit
exit
Script done on Tue Dec  9 15:22:32 2003

... Guess not.

Cheers,
Dick Johnson
Penguin : Linux version 2.4.22 on an i686 machine (797.90 BogoMips).
            Note 96.31% of all statistics are fiction.