Замер времени выполенения команды

#!/bin/bash
#
# Andrey Zakharov 2010-03-01
# above due IFS 
# benchmark the command
# TODO export TIME
# http://vaultsoft.ru/src/bench-tool
 
ITERATE=1000
REST_TIME=5 #in sec (5-60)
LOG=./BENCHMARK-$$.csv
MAXTEST=3 #
#
# test cases
#
# without bb, with bb, another config
CMD=$(cat <<COMMANDS
conky -c $HOME/.conkyrc.fast -o -u 0 -i $ITERATE 2> /dev/null
conky -c $HOME/.conkyrc.fast -o -u 0 -i $ITERATE -b 2> /dev/null
conky -c $HOME/.conkyrc -o -u 0 -i $ITERATE 2> /dev/null
conky -c $HOME/.conkyrc -o -u 0 -i $ITERATE -b 2> /dev/null
conky -c $HOME/.conkyrc.daily -o -u 0 -i $ITERATE 2> /dev/null
conky -c $HOME/.conkyrc.daily -o -u 0 -i $ITERATE -b 2> /dev/null
COMMANDS)
 
#another config
#CMD="conky -c ~/.conkyrc -o -u 0 -i 2000 -b 2>/dev/null"
# ioscheduler
 
# env TIME can not be in subshell
TIME_FORMAT='%e,\t%U,\t%S,\t%P,\t%c,\t%I,\t%O\t%M' #for csv
 
BTIME=$( which time )
$BTIME --version
BTIME="$BTIME --format=$TIME_FORMAT --output=$LOG --append -- "
 
# or ~
cd $work_dir
echo $work_dir/BENCHMARK-$$.csv
 
 
(
    echo "$CMD"
) | while read ccmd; do
 
    echo BENCHING $ccmd
 
    echo $ccmd >> $LOG
    #format tip
    echo -e "#,\telap,\tuser,\tsys,\tproc,\tcxsw,\tinput,\toutput,\tmaxres" >> $LOG
    #todo axis
    #IFS=$oldifs
    for j in $( seq $MAXTEST -1 1 ); do
        echo "Remain $j times!"
        echo -ne "$j,\t" >> $LOG
    # prepare, make external-clean clean >/dev/null
    # bench cmd: $BTIME make MVNOPTS=--offline BJAM_OPTS=-j$j -j$j all
        $BTIME $ccmd
        echo "Get a rest..."
        sleep $REST_TIME
    done
done