New VM Testcase (2.4.18pre7 SWAPS) (2.4.17-rmap12b OK)

[Roger Larsson <roger.larsson@norran.net> (by way of Roger Larsson <roger.larsson@norran.net>)]

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When examining Karlsbakk problem I got into one quite different myself.

I have a 256MB UP PII 933 MHz.
When running the included program with an option of 200
(serving 200 clients with streaming data a 10MB... on first run
it creates the data, from /dev/urandom - overkill from /dev/null is ok!)

ddteset.sh 200
[testcase initially written by Roy Sigurd Karlsbakk, he does not get
into this - but he has more RAM]

the 2.4.18pre7 goes into deep swap after awhile .
It is impossible to start a new login, et.c. finally
the dd processes begins to be OOM killed... not nice...

the 2.4.17-rmap12b handles this MUCH nicer!

/RogerL

--
Roger Larsson
Skelleftea
Sweden



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[-- Type: application/x-shellscript, Size: 890 bytes --]

#!/bin/bash
MAX=100
BS=$((1024 * 2048))
COUNT=10
FPATH=/tmp

case $# in
        0)
                i=$COUNT
                ;;

        1)
                i=$1
                ;;
        *)
                printf "Error:\nSyntax: $0 [ numfiles ]\n"
                exit
                ;;
esac

if [[ $i -lt 1 ]]; then
        printf "Can't read $i files\n"
        exit
fi

if test \! -f `printf "%s/file%04d.mp0" $FPATH $i`; then
        c=$i
        echo "Writing $c files..."

        while [[ $c -gt 0 ]]; do
                file=`printf "%s/file%04d.mp0" $FPATH $c`
                touch $file
                dd if=/dev/urandom of=$file bs=$BS count=$COUNT
                c=$(( $c - 1 ))
        done
fi

printf "Reading $i files..\n"

while [[ $i -gt 0 ]]; do
        file=`printf "%s/file%04d.mp0" $FPATH $i`
        dd if=$file of=/dev/null bs=$BS &
        i=$(( $i - 1 ))
done