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execution time / runtime -- bash script please help!

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# 1  
Old 10-24-2009
Question execution time / runtime -- bash script please help!
Hello,

I'm running a bash script and I'd like to get more accurate a runtime information then now.

So far I've been using this method:

Code:
STARTM=`date -u "+%s"`
.........
*script function....
.........
STOPM=`date -u "+%s"`
RUNTIMEM=`expr $STOPM - $STARTM`
if (($RUNTIMEM>59)); then
TTIMEM=`printf "%dm%ds\n" $((RUNTIMEM/60%60)) $((RUNTIMEM%60))`
else
TTIMEM=`printf "%ds\n" $((RUNTIMEM))`
fi

echo "Executing "script function" took: $TTIMEM"

However the script often runs under one second, so the result is 0s.

I'd like it display a more accurate runtime, best 0.015s or 1.123s and so on...

time {} is not really an option.. need the result as var as I pass it to another script...
# 2  
Old 10-24-2009
Would this work perhaps (using GNU date)?:
Code:
res1=$(date +%s.%N)
sleep 1
res2=$(date +%s.%N)
echo "Start time: $res1"
echo "Stop time:  $res2"
echo "Elapsed:    $(( res2 - res1 ))"

Code:
$> ./test2
Start time: 1256415694.189522104
Stop time:  1256415695.193247576
Elapsed:    1.00372547202277929

Last edited by Scrutinizer; 10-24-2009 at 06:26 PM.. Reason: The previous string was not correct around date changes
# 3  
Old 10-24-2009
Quote:
Originally Posted by Scrutinizer
Would this work perhaps (using GNU date)?:
Code:
res1=$(date +%Y%m%d%H%M%S.%N)
sleep 1
res2=$(date +%Y%m%d%H%M%S.%N)
echo "Start time: $res1"
echo "Stop time:  $res2"
echo "Elapsed:    $(( res2 - res1 ))"

Code:
$> ./test
Start time: 20091024220906.158808557
Stop time:  20091024220907.165223775
Elapsed:    1.00641441345214844


I've tested your code and I get this:

Code:
Start time: 20091024222112.280942000
Stop time:  20091024222113.284852000
./test: line 8: 20091024222113.284852000: syntax error in expression (error token is ".284852000")

Besides having the result 3 spots after comma would be nice too... and if the result is over 59 seconds then it has to be normal again 1m or 1m 20s and so on...
# 4  
Old 10-24-2009
Ow that is right I tested it in ksh93. Bash can't deal with that.

Alternatively:
Code:
res1=$(date +%s.%N)
sleep 1
res2=$(date +%s.%N)
echo "Start time: $res1"
echo "Stop time:  $res2"
echo "Elapsed:    $(echo "$res2 - $res1"|bc )"

This User Gave Thanks to Scrutinizer For This Post:
kalak
# 5  
Old 10-24-2009
Quote:
Originally Posted by Scrutinizer
Ow that is right I tested it in ksh93. Bash can't deal with that.

Alternatively:
Code:
res1=$(date +%s.%N)
sleep 1
res2=$(date +%s.%N)
echo "Start time: $res1"
echo "Stop time:  $res2"
echo "Elapsed:    $(echo "$res2 - $res1"|bc )"

Ok this time it works, what about the 3 spots (digits) after comma? And normal if higher then 59s ? Basically could you rewritte this into the form I posted in the beginning?
# 6  
Old 10-24-2009
Too much precision, hey? Why don't you printf it into shape:
e.g.
Code:
printf "Elapsed:    %.3F\n"  $(echo "$res2 - $res1"|bc )

# 7  
Old 10-24-2009
Works like a harm, thank you.
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