Yesterday Jeff Chua of FexEx (Federal Express) <[EMAIL PROTECTED]>
showed up at my office armed with a set of test scripts and a laptop
running LPRng. He demonstrated the problem of the 'missing datafile'
during job transfers. I have fixed the problem in this release.
The test is so clever that I thought I would share it and put it into the
changes file for posterity.
The first step was to set up a print queue:
lp:
:sd=/tmp/lpd/%P
:filter=/tmp/testfilter
:lp=/dev/null
The /tmp/testfilter is:
#!/bin/sh
if [ ! -d /tmp/files ] ; then mkdir /tmp/files ; fi
# read the first line of the job and create a file with the name
read var
date >/tmp/files/$var
Now here is the script we use to test the queue:
#!/usr/local/bin/bash
# /tmp/testpr
set -x
lprm -Plp all
d=/tmp/files
if [ ! -d $d ] ; then mkdir -p $d; fi
chmod 777 /tmp/files
(cd /tmp/files; rm -f *; )
Here is a script to submit the jobs:
#/bin/bash
# print a job with a number as the contents
for((i=${2:-0}; i < ${1:-10}; ++i)) ; do echo $i |lpr -Pp; done;
Lets run this with printing disabled:
> lpc -P stop
> bash /tmp/testpr 999
+ lprm -Plp all
Printer lp@h110:
+ d=/tmp/files
+ '[' '!' -d /tmp/files ']'
+ cd /tmp/files
+ rm -f '*'
+ (( i=0 ))
+ (( i < 999 ))
+ echo 0
+ lpr -Pp
+ (( ++i ))
+ (( i < 999 ))
+ echo 1
+ lpr -Pp
+ (( ++i ))
+ (( i < 999 ))
+ echo 2
+ lpr -Pp
+ (( ++i ))
+ (( i < 999 ))
+ echo 3
And we get:
> lpq
Printer: lp@h110 (printing disabled)
Queue: 999 printable jobs
Server: no server active
Rank Owner/ID Class Job Files Size Time
1 papowell@h110+384 A 384 (STDIN) 2 08:40:56
2 papowell@h110+387 A 387 (STDIN) 2 08:40:56
3 papowell@h110+390 A 390 (STDIN) 2 08:40:56
4 papowell@h110+393 A 393 (STDIN) 2 08:40:56
...
Now if you enable printing (lpc start) then you can get the jobs in the
output queue.
This is DEFINATELY clever.
We can use this for testing spooling rates, throughput, etc. etc. etc.
Here is how to bring the system to its knees:
bash /tmp/testpr 200 0 &
bash /tmp/testpr 400 200 &
bash /tmp/testpr 600 400 &
bash /tmp/testpr 800 600 &
bash /tmp/testpr 1000 800 &
You can modify this a bit so that you put:
#/bin/bash
# print a job with a number as the contents
hostname=`hostname`
for((i=${2:-0}; i < ${1:-10}; ++i)) ; do echo ${hosname}.${i} |lpr -Pp -J
"${hostname}.${i}"; done;
Patrick ("very very clever") Powell
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