I am publishing my MySQL related bookmark collection http://www.mysqlpreacher.com/bookmarks/.
Feel free to send me links you think might be good to add in order to help others.
Remember, SHARING IS CARING!!! …. we get so much for free, why shouldn’t we give some back?
Cheers,
Darren
Giving a bunch of mysql instances something you do everyday and you might think ….. how should I do it? Write a bunch of selects and inserts manually? nahh that takes s**tload of time, should I run binlogs collected from a live system on my test server? nahh thats not practical nor is it real since it doesn’t contain selects, should I gather the general query log and try that out? nahhh …..
MySQL has been kind enough to supply us with their mysql_slap which does the job for us and given I needed to do a proof of concept on monitoring a group of 4 circular replicated servers I wrote a small script which does the job of slapping them with a varying level of concurrancy, iterations, number of queries and connections for as long as you like.
Here it is and I hope some of you might find it useful for slapping their own test servers :).
#!/bin/bash
NumberOfConcurrentLoads=4
LOGFILE=randomslap-4n-circularreplication
load () {
run=0
#Obtaining pid of the current process
PID=$$
echo "MySQL Slap random loading MySQL instances" >> $LOGFILE-$PID.log
echo "Loading child $a out of $NumberOfConcurrentLoads" >> $LOGFILE-$PID.log
echo "Starting at: `date`" >> $LOGFILE-$PID.log
echo ""
while [ 1 ]
do
#Generate a few values for the actual command to run through
prt=$((RANDOM%4+17001)) #ports being 17001,17002,17003,17004
cnc=$((RANDOM%50+1)) #number of concurrent sessions
itr=$((RANDOM%9+1)) #number of iterations
noq=$((RANDOM%100+50)) #number of queries
sec=$((RANDOM%30+10)) #seconds idle after finishing the process
echo "Run number $run" >> $LOGFILE-$PID.log
echo `date +%Y/%m/%d---%H:%M | sed 's/---/ /'` >> $LOGFILE-$PID.log
echo "Port=$prt" >> $LOGFILE-$PID.log
echo "Concurrency=$cnc" >> $LOGFILE-$PID.log
echo "Iterations=$itr" >> $LOGFILE-$PID.log
echo "Number-Of-Queries=$noq" >> $LOGFILE-$PID.log
echo "Breaktime=$sec" >> $LOGFILE-$PID.log
echo "Output:" >> $LOGFILE-$PID.log
mysqlslap --user=root --password='msandbox' --auto-generate-sql -vv -h hostname -P $prt --concurrency=$cnc --iterations=$itr --number-of-queries=$noq >> $LOGFILE-$PID.log
run=`expr $run + 1`
sleep $sec
done
}
#Fork a number of concurrent scripts to emulate more of a realistic load rather than one process connecting to just one server at a time
for ((a=1;a<=NumberOfConcurrentLoads;a++))
do
load &
done
If you are wondering … yes I totally indendate my code :) but the html version came out this way and I didn’t bother with indenting it using html really.
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