Joshua Lückers Random stuff from a guy who likes Information Technology

Performance Showdown

While browsing the internet I came across a nice little script which shows how fast your CPU can calculate the first 5000 decimals of PI.
This is my result (using a laptop) running a 64bit version of Ubuntu 10.04:

model name : Intel(R) Core(TM) i5 CPU M 430 @ 2.27GHz
model name : Intel(R) Core(TM) i5 CPU M 430 @ 2.27GHz
model name : Intel(R) Core(TM) i5 CPU M 430 @ 2.27GHz
model name : Intel(R) Core(TM) i5 CPU M 430 @ 2.27GHz

Calculating the first 5000 decimals of pi using 4 parallel processes
Total time: 57.76 seconds
Average time per calculation: 14.44 seconds

Not bad for a laptop eh?
Today I tested it again with almost no applications open:

model name : Intel(R) Core(TM) i5 CPU M 430 @ 2.27GHz
model name : Intel(R) Core(TM) i5 CPU M 430 @ 2.27GHz
model name : Intel(R) Core(TM) i5 CPU M 430 @ 2.27GHz
model name : Intel(R) Core(TM) i5 CPU M 430 @ 2.27GHz

Calculating the first 5000 decimals of pi using 4 parallel processes
Total time: 55.45 seconds
Average time per calculation: 13.86 seconds

Want to test how fast your CPU can make those calculations? Then use the script below and post your results:

N=`cat /proc/cpuinfo | grep processor | wc -l`
 
cat /proc/cpuinfo | grep "model name"
echo
echo "Calculating the first 5000 decimals of pi using $N parallel processes"
TimeBegin=`date +%s.%N`
 
for ((i=1; i< =$N; i++))
do
        echo "scale=5000; 4*a(1)" | bc -l -q > /dev/null &
done
wait
 
TimeEnd=`date +%s.%N`
DT=`echo "scale=2; ($TimeEnd - $TimeBegin) / 1" | bc`
echo "Total time: $DT seconds"
DTc=`echo "scale=2; ($TimeEnd - $TimeBegin) / $N" | bc`
echo "Average time per calculation: $DTc seconds"

update: some users reported that above script doesn't work. If this is the case try this oneinstead.