Re: linux equiv for pstat, NIS problems

Harald Koenig (koenig@tat.physik.uni-tuebingen.de)
Mon, 16 Dec 1996 11:06:38 +0100 (MET)

> > > We are currently using "ps ax | wc -l" to get
> > > the process total, but have not yet found a way to count total open files.
> >
> > Quick and dirty
> >
> > echo `find /proc/[0-9]* -path '*/fd/*' | wc -l` / \
> > `cat /proc/sys/kernel/file-max`

echo /proc/[0-9]*/fd/* | wc -w
or
set /proc/[0-9]*/fd/*
echo $#

is a bit less overhead

> ahhhh....thanks =) Found what we need in /proc/sys/kernel/file-nr and
> inode-nr, but you got me going in the right direction =) Much appreciated!

/proc/sys/kernel/file-nr doesn't seem to be the number of all open file
descriptors. why ?!

# find /proc/[0-9]* -path '*/fd/*' | wc -l
185
# echo /proc/[0-9]*/fd/* | wc -w
188
# cat /proc/sys/kernel/file-nr
192

difference between "find" and "echo" method are due to open file handles
of the interactive shell. but /proc/sys/kernel/file-nr is higher.

now I start 10 times

sleep 999 < /vmlinuz &

(you can redirect input or output to any unused/not_opened file)
and now I get

# find /proc/[0-9]* -path '*/fd/*' | wc -l
215
# echo /proc/[0-9]*/fd/* | wc -w
218
# cat /proc/sys/kernel/file-nr
192

why didn't /proc/sys/kernel/file-nr change it's value at all ??

Harald

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