linuxaudio.org

On Thu, 2007-10-11 at 13:42 -0400, Ross Vandegrift wrote:

quoted text
> On Tue, Oct 09, 2007 at 06:58:40PM +0700, Patrick Shirkey wrote:

> > Does anyone have a script for monitoring with iostat or vmstat while in

> > async mode?

> >

> > I'm thinking a bash equivalent to the disk monitor on gkrellm which

> > allows me to know when a transfer has completed.

>

> Something like this will return when five seconds have passed with

> no write requests being issues to the device sda:

>

> CURRENT=$(cat /proc/diskstats | grep sda\  | awk '{ print  }')

> LAST=0

> while true; do

> 	LAST=CURRENT

> 	sleep 5

> 	CURRENT=$(cat /proc/diskstats | grep sda\  | awk '{ print  }')

> 	if [ "$LAST" == "$CURRENT" ]; then

> 		break

> 	fi

> done

>

>

> /proc/diskstats lists a few things.  For complete devices (ie,

> /dev/sda instead of /dev/sda1), it lists:

>

> Field 1 -- # of reads issued

> Field 2 -- # of reads merged, field 6 -- # of writes merged

> Field 3 -- # of sectors read

> Field 4 -- # of milliseconds spent reading

> Field 5 -- # of writes completed

> Field 7 -- # of sectors written

> Field 8 -- # of milliseconds spent writing

> Field 9 -- # of I/Os currently in progress

> Field 10 -- # of milliseconds spent doing I/Os

> Field 11 -- weighted # of milliseconds spent doing I/Os

>

>

> Where field n is the nth field after the device name.

>

Hi,
Thanks everyone again for your suggestions. The above is exactly what I

was thinking of. Thanks very much Ross. I owe you a beer.
I had to make a couple of small changes.
CURRENT=$(cat /proc/diskstats | grep sdb\  | awk '{ print $8 }')

LAST=0

while true; do
        echo -en l = $LAST c = $CURRENT \\n

        sleep 5

        CURRENT=$(cat /proc/diskstats | grep sdb\  | awk '{ print $8 }')

        if [ $LAST == $CURRENT ]; then

                break

        fi
        LAST=$CURRENT

done
Cheers.
--

Patrick Shirkey

Boost Hardware Ltd.