Awk file :
avr.awk Computing the average : BEGIN { FS = " "} { nl++ } { s=s+$1} END {print "average:" s/nl}
stdv.awk Computing thestandard deviation.: BEGIN {FS=" "}{ln++}{d=$1-t}{s2=s2+d*d} END {print "standev:" sqrt(s2/ln)}
PERL FILES: (펄을 이용하여 계산 하기)
throughput.pl Computing the throughput
column.pl Extracting a column from a file
참고 : http://www-sop.inria.fr/mistral/personnel/Eitan.Altman/ns.htm
How to measure overhead with ns2
Count the number of sent packets at the agent or router layer
Use
to filter based on certain fields (9999= packet UID)
cat out.tr | grep " 2 3 cbr " | grep ^r | column 1 10 | awk '{dif = $2 - old2; if(dif==0) dif = 1; if(dif > 0) {printf("%d\t%f\n", $2, ($1 - old1) / dif); old1 = $1; old2 = $2}}' > jitter.txt
이 shell 명령은 n3에서 "CBR packet receive" event를 선택하고, time(column 1)과 sequence number (column 10)을 선택하고, 마지막 packet 수신시간과 각 sequence number에 대한 sequence number(loss packet에 대한)에서의 차이로 나눈 차이를 계산한다. 다음은 gnuplot를 사용하여 생성된 jitter graph이다. X축은 packet sequence number이며, Y축은 초당 simulation 시간이다.
정리 : 2006.12.13 by 임헌정
http://www.4ellene.net
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