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Home > Forums > MIS/IT > Operating Systems - UNIX based > IBM: AIX > FAQs

IBM: AIX FAQ

Troubleshooting

finetuning the vmtune and schedtune by MoshiachNow
faq52-1855
Posted: 1 May 02

I used to use the following script to find the best params for the vmtune and schedtune.
The script runs any given "APPLICATION" in loop,while changing some vmtune params,displaying the results on the screen and as well,writing to log.
After every change,it loads the original vmtune params,to reset the situation.

in the "timex APPLICATION 0 2>$TIMEX_LOG" change the "APPLICATION" to your application in question path.
One can also add aaditional params that he wants to change.
===============================================
#!/bin/ksh
#The scripts runs the performance benchmark,while changing vmtune and other parameters,one at a time.It prints the vmtune params and the related benchmarks results into a log file.
#Default vmtune values loaded on boot:
#/utils/admin/sci_admin: /usr/samples/kernel/vmtune -p 10 -P 30 -c 1 -R 64 -f 120 -F 184"

SCI_TEMP="/scitex/version/temp"
PERFTUNE_LOG="/$SCI_LOGS/perftune.log"
BENCHMARK_LOG="/scitex/version/logs/BENCHMARK.log"

HOSTNAME=`hostname`
MEMORY=`bootinfo -r`
MODELNAME=`lsattr -El sys0 | grep modelname |awk '{ print $2 }'`
PAGINGSPACE=`lsps -a -s | grep MB |awk '{ print $1 }'`
DATE=`date`
NOOFPROCS=`lscfg | grep proc | wc -l|awk '{ print $1 }'`
integer PERCENT=0
integer DEFAULT=5000
integer AVERAGE=0

RESET_VMTUNE ()
{
#reset to default vmtune params:
/usr/samples/kernel/vmtune -p 10 -P 30 -c 1 -R 64 -f 120 -F 184 -r 2 -b 93 >/dev/null
}

RESET_SCHEDTUNE ()
{
#reset to default vmtune params:
/usr/samples/kernel/schedtune -D >/dev/null
}

#Initialize variables:
RESET_VMTUNE
RESET_SCHEDTUNE
VMTUNE=`/usr/samples/kernel/vmtune`
SCHEDTUNE=`/usr/samples/kernel/schedtune`
TIMEX_LOG='/tmp/timex.log'
touch $BENCHMARK_LOG

RUN_BENCHMARK ()
{
#Runs each eteration 3 times and averages the result,displaying percentage relevant to Default values run
COUNT=3
AVERAGE=0
while (( $COUNT != 0 ))
do
timex APPLICATION 0 2>$TIMEX_LOG
#Get the run time
integer REAL=`grep real $TIMEX_LOG |awk '{ print $2 }'`
echo "|$REAL\c" >> $PERFTUNE_LOG
AVERAGE=$AVERAGE+$REAL
COUNT=$COUNT-1
fi
done
#Calculate the average of the 3 runs and it's percentage versus the default run
AVERAGE=$AVERAGE/3
#Set PERCENT to 100 for the default run
if [[ $PERCENT -ne 0 ]]
then
PERCENT=`echo "scale=4;$AVERAGE*100/$DEFAULT"|bc`
else
    PERCENT=100
fi    
#Establish the used paging space
usedPS=`lsps -a|grep rootvg|awk '{ print $5 }'`

echo "|| Average time = $AVERAGE seconds ,$PERCENT%", Used PS=$usedPS%>> $PERFTUNE_LOG
RESET_VMTUNE
RESET_SCHEDTUNE
}

#MAIN

#copy the last log file to xx.001
cp $PERFTUNE_LOG $PERFTUNE_LOG.001
echo "===========================" > $PERFTUNE_LOG
echo  "$HOSTNAME  , $MODELNAME , No of PROCS = $NOOFPROCS , Memory =$MEMORY , VER=$VERSION" , PAGINGSPACE=$PAGINGSPACE ,   $DATE >> $PERFTUNE_LOG
echo "-----------" >> $PERFTUNE_LOG
echo "VMTUNE DEFAULT PARAMETERS:" >> $PERFTUNE_LOG
echo "-----------" >> $PERFTUNE_LOG
echo  "$VMTUNE" >> $PERFTUNE_LOG
echo "-----------" >> $PERFTUNE_LOG

#Running with a default values:
RESET_VMTUNE
RESET_SCHEDTUNE
echo "-----------" >> $PERFTUNE_LOG
echo "##########################################" >> $PERFTUNE_LOG
echo  " Running with a default values" >> $PERFTUNE_LOG
echo "-----------" >> $PERFTUNE_LOG
printf " %-3s %-3s " '  ' '   ' >> $PERFTUNE_LOG
RUN_BENCHMARK
#keep the Default time (run with default params) for percentage calculation
DEFAULT=$AVERAGE
echo "##########################################" >> $PERFTUNE_LOG

#Changing -P = maxperm values:
echo "##########################################" >> $PERFTUNE_LOG
echo  " Changing -P=maxperm  values in range 40/60/80%" >> $PERFTUNE_LOG
echo "-----------" >> $PERFTUNE_LOG
for P in 40 60 80
do
printf " %-3s %-3s " "-P=" "$P" >> $PERFTUNE_LOG
/usr/samples/kernel/vmtune -P $P >/dev/null
    RUN_BENCHMARK
done

#Changing  -r = minpgahead values:
echo "##########################################" >> $PERFTUNE_LOG
echo  " Changing -r = minpgahead values in range 8/16/32 " >> $PERFTUNE_LOG
echo "-----------" >> $PERFTUNE_LOG
for r in 8 16 32
do
printf " %-3s %-3s " "-r=" "$r" >> $PERFTUNE_LOG
/usr/samples/kernel/vmtune -r $r >/dev/null
    RUN_BENCHMARK
done

#Changing -R = maxpgahead values:
echo "##########################################" >> $PERFTUNE_LOG
echo  " Changing -R= maxpgahead values in range 16/32/128 " >> $PERFTUNE_LOG
echo "-----------" >> $PERFTUNE_LOG
for R in 16 32 128
do
printf " %-3s %-3s " "-R=" "$R" >> $PERFTUNE_LOG
/usr/samples/kernel/vmtune -R $R >/dev/null
    RUN_BENCHMARK
done

#Changing -f =  minfree values:
echo "##########################################" >> $PERFTUNE_LOG
echo  " Changing -f = minfree values in range 90/150/180 " >> $PERFTUNE_LOG
echo "-----------" >> $PERFTUNE_LOG
for f in 90 150 180
do
printf " %-3s %-3s " "-f=" "$f" >> $PERFTUNE_LOG
/usr/samples/kernel/vmtune -f $f >/dev/null
    RUN_BENCHMARK
done

#Changing -F  =  maxfree values:
echo "##########################################" >> $PERFTUNE_LOG
echo  " Changing -F = maxfree values in range 160/200/220 " >> $PERFTUNE_LOG
echo "-----------" >> $PERFTUNE_LOG
for F in 160 200 220
do
printf " %-3s %-3s " "-F=" "$F" >> $PERFTUNE_LOG
/usr/samples/kernel/vmtune -F $F >/dev/null
    RUN_BENCHMARK
done

#Changing -c  =  numclust values:
echo "##########################################" >> $PERFTUNE_LOG
echo  " Changing -c = numclust values in range 0 " >> $PERFTUNE_LOG
echo "-----------" >> $PERFTUNE_LOG
for c in 0
do
printf " %-3s %-3s " "-c=" "$c" >> $PERFTUNE_LOG
/usr/samples/kernel/vmtune -c $c >/dev/null
    RUN_BENCHMARK
done

####################################################################################
#Now we change the schedtune parameters:
echo " SCHEDTUNE DEFAULT PARAMETERS:" >> $PERFTUNE_LOG
echo "-----------" >> $PERFTUNE_LOG
echo  "$SCHEDTUNE " >> $PERFTUNE_LOG
echo "-----------" >> $PERFTUNE_LOG

#Changing -f  = TICKS values:
echo "##########################################" >> $PERFTUNE_LOG
echo  " Changing -f = TICKS  values in range 20/30/40 " >> $PERFTUNE_LOG
echo "-----------" >> $PERFTUNE_LOG
for f in 20 30 40
do
printf " %-3s %-3s " "-f=" "$f" >> $PERFTUNE_LOG
/usr/samples/kernel/schedtune -f $f >/dev/null
    RUN_BENCHMARK
done

#Changing  -d = SCHED_D values:
echo "##########################################" >> $PERFTUNE_LOG
echo  " Changing -d = SCHED_D  values in range 8/32 " >> $PERFTUNE_LOG
echo "-----------" >> $PERFTUNE_LOG
for d in 8 32
do
printf " %-3s %-3s " "-d=" "$d" >> $PERFTUNE_LOG
/usr/samples/kernel/schedtune -d $d >/dev/null
    RUN_BENCHMARK
done

#Changing  -r  = SCHED_R values:
echo "##########################################" >> $PERFTUNE_LOG
echo  " Changing -r = TICKS  values in range 8/12/20 " >> $PERFTUNE_LOG
echo "-----------" >> $PERFTUNE_LOG
for r in 8 12 20
do
printf " %-3s %-3s " "-r=" "$r" >> $PERFTUNE_LOG
/usr/samples/kernel/schedtune -r $r >/dev/null
    RUN_BENCHMARK
done

#Changing  -m  = MULTI values:
echo "##########################################" >> $PERFTUNE_LOG
echo  " Changing -m = MULTI values in range 4/6/8/10 " >> $PERFTUNE_LOG
echo "-----------" >> $PERFTUNE_LOG
for m in 4 6 8 10
do
printf " %-3s %-3s " "-m=" "$m" >> $PERFTUNE_LOG
/usr/samples/kernel/schedtune -m $m >/dev/null
    RUN_BENCHMARK
done

#Changing  -w  = WAIT values:
echo "##########################################" >> $PERFTUNE_LOG
echo  " Changing -w = WAIT values in range 2/4 " >> $PERFTUNE_LOG
echo "-----------" >> $PERFTUNE_LOG
for w in 2 4
do
printf " %-3s %-3s " "-w=" "$w" >> $PERFTUNE_LOG
/usr/samples/kernel/schedtune -w $w >/dev/null
    RUN_BENCHMARK
done

#Changing  -e  = GRACE values:
echo "##########################################" >> $PERFTUNE_LOG
echo  " Changing -e = GRACE values in range 1/4 " >> $PERFTUNE_LOG
echo "-----------" >> $PERFTUNE_LOG
for e in 1 4
do
printf " %-3s %-3s " "-e=" "$e" >> $PERFTUNE_LOG
/usr/samples/kernel/schedtune -e $e >/dev/null
    RUN_BENCHMARK
done

#Changing  -t  = MULTI values:
echo "##########################################" >> $PERFTUNE_LOG
echo  " Changing -t = TIMESLICE values in range 2/4 " >> $PERFTUNE_LOG
echo "-----------" >> $PERFTUNE_LOG
for t in 2 4
do
printf " %-3s %-3s " "-t=" "$t" >> $PERFTUNE_LOG
/usr/samples/kernel/schedtune -t $t >/dev/null
    RUN_BENCHMARK
done

mail -s "$MODELNAME- PERFTUNE" <MAILADDRESS> < $PERFTUNE_LOG

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