using perl in real life of a sysadm, not a fan story, but a concrete example to solve every day problemd

1. needs that lead to the camel
Per l
1987
18 December
ld12 - imolug pvb265

2. needs that lead to the camel LD12
a genda
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter
.. basics by examples
.. not to do
. thank's Larry
ld12 - imolug pvb265

3. needs that lead to the camel LD12
scenario
ld12 - imolug pvb265

4. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter
.. basics by examples
.. not to do
. thank's Larry
● our e-commerce site is slow
● we are loosing money due to slow performance
● the users experience says that the site is unusable
ld12 - imolug pvb265

5. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter
.. basics by examples
.. not to do
● our e-commerce site is slow
. thank's Larry
● we are loosing money due to slow performance
● the users experience says that the site is unusable
● resolve the issue
● do it soon
ld12 - imolug pvb265

6. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter
.. basics by examples
.. not to do
● our e-commerce site is slow
. thank's Larry
● we are loosing money due to slow performance
● the users experience says that the site is unusable
● resolve the issue
● do it soon
db-server
ld12 - imolug pvb265

7. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter
.. basics by examples
.. not to do
● our e-commerce site is slow
. thank's Larry
● we are loosing money due to slow performance
● the users experience says that the site is unusable
● resolve the issue
● do it soon
app-server db-server
ld12 - imolug pvb265

8. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter
.. basics by examples
.. not to do
● our e-commerce site is slow
. thank's Larry
● we are loosing money due to slow performance
● the users experience says that the site is unusable
● resolve the issue
● do it soon
web-server app-server db-server
ld12 - imolug pvb265

9. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter
.. basics by examples
.. not to do
● our e-commerce site is slow
. thank's Larry
● we are loosing money due to slow performance
● the users experience says that the site is unusable
● resolve the issue
● do it soon
web-cluster app-cluster db-cluster
ld12 - imolug pvb265

10. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter
.. basics by examples
.. not to do
● our e-commerce site is slow
. thank's Larry
● we are loosing money due to slow performance
● the users experience says that the site is unusable
● resolve the issue
● do it soon
● complexity and high reliability
web-cluster app-cluster db-cluster
ld12 - imolug pvb265

11. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter
.. basics by examples
.. not to do
● our e-commerce site is slow
. thank's Larry
● we are loosing money due to slow performance
● the users experience says that the site is unusable
● logs are our best friends
● logs must exists
● logs must be readable
● logs may be very large
ld12 - imolug pvb265

12. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter
.. basics by examples
.. not to do
● our e-commerce site is slow
. thank's Larry
● we are loosing money due to slow performance
● the users experience says that the site is unusable
● logs are our best friends
MacBook-Pro-di-valerio:data valeriobalbi$ ls -l
total 208392
-rw-r--r-- 1 valeriobalbi staff 106676224 24 Set 16:57 www.imolugcommerce.com-access.log
MacBook-Pro-di-valerio:data valeriobalbi$ head 10 www.imolugcommerce.com-access.log
head: 10: No such file or directory
==> www.imolugcommerce.com-access.log <==
109.93.188.182,-,-,[09/Apr/2012:23:59:05,+0200],0,200,8895,109.93.188.182,www.imolugcommerce.com,(core.c/0/handler),-,"GET,/wcsstore/TSTB
109.93.188.182,-,-,[09/Apr/2012:23:59:05,+0200],0,200,5737,109.93.188.182,www.imolugcommerce.com,(core.c/0/handler),-,"GET,/wcsstore/TSTB
109.112.65.154,-,-,[09/Apr/2012:23:59:05,+0200],0,200,19398,109.112.65.154,www.imolugcommerce.com,(core.c/0/handler),-,"GET,/wcsstore/TST
109.93.188.182,-,-,[09/Apr/2012:23:59:05,+0200],0,200,13405,109.93.188.182,www.imolugcommerce.com,(core.c/0/handler),-,"GET,/wcsstore/TST
109.121.26.105,-,-,[09/Apr/2012:23:59:04,+0200],0,200,16210,109.121.26.105,www.imolugcommerce.com,(mod_was_ap22_http.c/-2/handler),wcn
109.93.188.182,-,-,[09/Apr/2012:23:59:05,+0200],0,200,893,109.93.188.182,www.imolugcommerce.com,(core.c/0/handler),-,"GET,/wcsstore/TSTB2
79.103.238.28,-,-,[09/Apr/2012:23:59:05,+0200],0,404,333,79.103.238.28,www.imolugcommerce.com,(core.c/404/handler),-,"GET,/wcsstore/TSTB2
109.112.65.154,-,-,[09/Apr/2012:23:59:05,+0200],0,200,4612,109.112.65.154,www.imolugcommerce.com,(core.c/0/handler),-,"GET,/wcsstore/TSTB
109.112.65.154,-,-,[09/Apr/2012:23:59:05,+0200],0,200,1333,109.112.65.154,www.imolugcommerce.com,(core.c/0/handler),-,"GET,/wcsstore/TSTB
109.112.65.154,-,-,[09/Apr/2012:23:59:05,+0200],0,200,1062,109.112.65.154,www.imolugcommerce.com,(core.c/0/handler),-,"GET,/wcsstore/TSTB
ld12 - imolug pvb265

13. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter
.. basics by examples
.. not to do
● our e-commerce site is slow
. thank's Larry
● we are loosing money due to slow performance
● the users experience says that the site is unusable
● logs are our best friends
● response/minute
● return code http/minute
● top ten sloow response
ld12 - imolug pvb265

14. needs that lead to the camel LD12
canonical way
ld12 - imolug pvb265

15. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter
.. basics by examples
.. not to do
. thank's Larry
Bash Sed Awk
ld12 - imolug pvb265

16. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter
Bash
.. basics by examples
.. not to do
. thank's Larry
Sed Awk
Brian Fox GNU Project 1989
command processor script
wildcard piping variables Bourne-again shell
command($@) = $? stdOUT
stdIN → command →
command1 && command2 stdERR
command1 || command2 command [ | command2 ... ]
while list; do list; done $(command) `command`
until list; do list; done
$((expression))
ld12 - imolug pvb265

17. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter
Bash Sed Awk
.. basics by examples
.. not to do
. thank's Larry
stream editor Unix utility
parser text transformations line by line
1974 Lee E. McMahon
sed -e 's/old/new/g' inputFileName > outputFileName
cat inputFileName | sed -e 's/old/new/g'
cat inputFileName | sed 's/pattern//g'
cat inputFileName | sed '/pattern/d'
's/^$/VOIDLINE/g' 's/^[01]*a[bc]*//g'
ld12 - imolug pvb265

18. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter
Bash Sed Awk
.. basics by examples
.. not to do
. thank's Larry
Bell Labs 1977 operations on fields
Alfred Aho, Peter Weinberger, Brian Kernighan all OS
associative arrays regular expressions line_oriented
condition { action } cat inputFileName | awk '{ print $1 $2 }'
awk '{ print $1 $2 }' inputFileName > outputFileName
Inline
awk -F':' '{ print $1 $2 }' inputFileName
script
awk -f myscript.awk inputFileName
awk ' if ( NR > 10 ) { print $1 $2 } ' BEGIN { FS=":" }
{ print $1 }
END { print “hello world!” }
ld12 - imolug pvb265

19. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter
.. basics by examples
.. not to do #!/bin/bash
. thank's Larry MAXMIN=1440
LOGFILE=$1
declare -ax vect
echo "Inizializzazione $(date)"
for (( i=0 ; $i<$MAXMIN ; i++ )) ; do vect[$i]=0 ; done
echo "Analisi File $(date)"
IFS=","
while read a1 a2 a3 a4 a5 a6 a7 a8 a9 a10 a11 a12 a13 a14 a15 a16 a17
do
minute=$(echo $a4|awk -F':' ' { print $3} '|sed 's/^0*//g')
awk sed
hour=$(echo $a4|awk -F':' ' { print $2} '|sed 's/^0*//g')
sed
if [ "$minute." == "." ]; then minute=0; fi
if [ "$hour." == "." ]; then hour=0; fi
tmp_m=$(($hour*60))
minutes=$(($tmp_m+$minute))
vect[$minutes]=$((${vect[$minutes]}+1))
done < $LOGFILE
echo "risultati $(date)"
for ( i=0 ; $i<$MAXMIN ; i++ ) ; do
echo -n "$i "
echo ${vect[$i]}
done
echo "fine $(date)"
ld12 - imolug pvb265

20. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter
.. basics by examples
.. not to do #!/bin/bash
. thank's Larry MAXMIN=1440
LOGFILE=$1
declare -ax vect
echo "Inizializzazione $(date)"
for (( i=0 ; $i<$MAXMIN ; i++ )) ; do vect[$i]=0 ; done
echo "Analisi File $(date)"
IFS=","
while read a1 a2 a3 a4 a5 a6 a7 a8 a9 a10 a11 a12 a13 a14 a15 a16 a17
do
minute=$(echo $a4|awk -F':' ' { print $3} '|sed 's/^0*//g')
awk sed
hour=$(echo $a4|awk -F':' ' { print $2} '|sed 's/^0*//g')
sed
if [ "$minute." == "." ]; then minute=0; fi
if [ "$hour." == "." ]; then hour=0; fi
tmp_m=$(($hour*60))
minutes=$(($tmp_m+$minute))
vect[$minutes]=$((${vect[$minutes]}+1))
done < $LOGFILE
echo "risultati $(date)"
for ( i=0 ; $i<$MAXMIN ; i++ ) ; do
echo -n "$i "
echo ${vect[$i]}
done
echo "fine $(date)"
ld12 - imolug pvb265

21. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter
.. basics by examples
.. not to do #!/bin/bash
. thank's Larry MAXMIN=1440
LOGFILE=$1
declare -ax vect
echo "Inizializzazione $(date)"
for (( i=0 ; $i<$MAXMIN ; i++ )) ; do vect[$i]=0 ; done
echo "Analisi File $(date)"
IFS=","
while read a1 a2 a3 a4 a5 a6 a7 a8 a9 a10 a11 a12 a13 a14 a15 a16 a17
do
minute=$(echo $a4|awk -F':' ' { print $3} '|sed 's/^0*//g')
awk sed
hour=$(echo $a4|awk -F':' ' { print $2} '|sed 's/^0*//g')
sed
if [ "$minute." == "." ]; then minute=0; fi
if [ "$hour." == "." ]; then hour=0; fi
tmp_m=$(($hour*60))
minutes=$(($tmp_m+$minute))
vect[$minutes]=$((${vect[$minutes]}+1))
done < $LOGFILE
echo "risultati $(date)"
for ( i=0 ; $i<$MAXMIN ; i++ ) ; do
echo -n "$i "
echo ${vect[$i]}
done
echo "fine $(date)"
ld12 - imolug pvb265

22. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter
.. basics by examples
.. not to do #!/bin/bash
. thank's Larry MAXMIN=1440
LOGFILE=$1
declare -ax vect
echo "Inizializzazione $(date)"
for (( i=0 ; $i<$MAXMIN ; i++ )) ; do vect[$i]=0 ; done
echo "Analisi File $(date)"
IFS=","
while read a1 a2 a3 a4 a5 a6 a7 a8 a9 a10 a11 a12 a13 a14 a15 a16 a17
do
minute=$(echo $a4|awk -F':' ' { print $3} '|sed 's/^0*//g')
awk sed
hour=$(echo $a4|awk -F':' ' { print $2} '|sed 's/^0*//g')
sed
if [ "$minute." == "." ]; then minute=0; fi
if [ "$hour." == "." ]; then hour=0; fi
tmp_m=$(($hour*60))
minutes=$(($tmp_m+$minute))
vect[$minutes]=$((${vect[$minutes]}+1))
done < $LOGFILE
echo "risultati $(date)"
for ( i=0 ; $i<$MAXMIN ; i++ ) ; do
echo -n "$i "
echo ${vect[$i]}
done
echo "fine $(date)"
ld12 - imolug pvb265

23. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter
.. basics by examples
.. not to do 8000
. thank's Larry 7000
6000
5000
f(x) = 4.63x - 0.06
4000
native
3000
Linear (native)
2000
1000
0
123,000
183,000
363,000
423,000
483,000
663,000
723,000
783,000
963,000
1,143,000
3,000
63,000
243,000
303,000
543,000
603,000
843,000
903,000
1,023,000
1,083,000
1,203,000
1,263,000
1,323,000
1,383,000
1,443,000
50 minutes for 600.000 requests
still no answer you gotta fired
ld12 - imolug pvb265

24. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter 1 #!/bin/bash
.. basics by examples MAXMIN=1440
.. not to do LOGFILE=$1
. thank's Larry declare -ax vect
2 echo "Inizializzazione $(date)"
for (( i=0 ; $i<$MAXMIN ; i++ )) ; do vect[$i]=0 ; done
2 echo "Analisi File $(date)"
IFS=","
while read a1 a2 a3 a4 a5 a6 a7 a8 a9 a10 a11 a12 a13 a14 a15 a16 a17
do
3 minute=$(echo $a4|awk -F':' ' { print $3} '|sed 's/^0*//g')
echo awk sed
3 hour=$(echo $a4|awk -F':' ' { print $2} '|sed 's/^0*//g')
echo sed
if [ "$minute." == "." ]; then minute=0; fi
if [ "$hour." == "." ]; then hour=0; fi
tmp_m=$(($hour*60))
minutes=$(($tmp_m+$minute))
vect[$minutes]=$((${vect[$minutes]}+1))
done < $LOGFILE
2 echo "risultati $(date)"
for ( i=0 ; $i<$MAXMIN ; i++ ) ; do
1 echo -n "$i "
1 echo ${vect[$i]}
done
2 echo "fine $(date)"
ld12 - imolug pvb265

25. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter 1 #!/bin/bash
.. basics by examples MAXMIN=1440
.. not to do LOGFILE=$1
. thank's Larry declare -ax vect
2 echo "Inizializzazione $(date)"
for (( i=0 ; $i<$MAXMIN ; i++ )) ; do vect[$i]=0 ; done
2 echo "Analisi File $(date)"
IFS=","
while read a1 a2 a3 a4 a5 a6 a7 a8 a9 a10 a11 a12 a13 a14 a15 a16 a17
do
minute=$(echo $a4|awk -F':' ' { print $3} '|sed 's/^0*//g')
echo awk sed
fork/exec → 2880+9 + 6N
3
3 hour=$(echo $a4|awk -F':' ' { print $2} '|sed 's/^0*//g')
echo sed
if [ "$minute." == "." ]; then minute=0; fi
line read → N
if [ "$hour." == "." ]; then hour=0; fi
tmp_m=$(($hour*60))
minutes=$(($tmp_m+$minute))
vect[$minutes]=$((${vect[$minutes]}+1))
done < $LOGFILE
2 echo "risultati $(date)" f(N)=6N+K
for ( i=0 ; $i<$MAXMIN ; i++ ) ; do
1 echo -n "$i "
1 echo ${vect[$i]}
done
2 echo "fine $(date)"
ld12 - imolug pvb265

26. needs that lead to the camel LD12
faster way
ld12 - imolug pvb265

27. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter
.. basics by examples
.. not to do
. thank's Larry
AngelSpot (@mod186k1) says:
why don't in PERL?
ld12 - imolug pvb265

28. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter #!/usr/bin/perl -w
.. basics by examples
.. not to do my $MAXMIN=1440;
. thank's Larry my $LOGFILE=shift();
my @vect;
print "Inizializzazione ".qx/'date'/;
for ( my $i=0 ; $i<$MAXMIN ; $i++ ) { $vect[$i]=0; }
print "Analisi File ".qx/'date'/;
open FILE, "<", $LOGFILE or die $!;
while (<FILE>) {
my @field=split(',',$_);
my ($d0, $hour, $minute, $d1)=split(':',$field[3]);
my $minutes=$hour*60+$minute;
$vect[$minutes]++;
}
close (FILE);
print "risultati ".qx/'date'/;
for ( my $j=0 ; $j<$MAXMIN ; $j++ ) {
printf "%s %sn",$j,$vect[$j];
}
print "fine ".qx/'date'/;
ld12 - imolug pvb265

29. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter #!/usr/bin/perl -w
.. basics by examples
.. not to do my $MAXMIN=1440;
. thank's Larry my $LOGFILE=shift();
my @vect;
print "Inizializzazione ".qx/'date'/;
for ( my $i=0 ; $i<$MAXMIN ; $i++ ) { $vect[$i]=0; }
print "Analisi File ".qx/'date'/;
open FILE, "<", $LOGFILE or die $!;
while (<FILE>) {
my @field=split(',',$_);
my ($d0, $hour, $minute, $d1)=split(':',$field[3]);
my $minutes=$hour*60+$minute;
$vect[$minutes]++;
}
close (FILE);
print "risultati ".qx/'date'/;
for ( my $j=0 ; $j<$MAXMIN ; $j++ ) {
printf "%s %sn",$j,$vect[$j];
}
print "fine ".qx/'date'/;
ld12 - imolug pvb265

30. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter #!/usr/bin/perl -w
.. basics by examples
.. not to do my $MAXMIN=1440;
. thank's Larry my $LOGFILE=shift();
my @vect;
print "Inizializzazione ".qx/'date'/;
for ( my $i=0 ; $i<$MAXMIN ; $i++ ) { $vect[$i]=0; }
print "Analisi File ".qx/'date'/;
open FILE, "<", $LOGFILE or die $!;
while (<FILE>) {
my @field=split(',',$_);
my ($d0, $hour, $minute, $d1)=split(':',$field[3]);
my $minutes=$hour*60+$minute;
$vect[$minutes]++;
}
close (FILE);
print "risultati ".qx/'date'/;
for ( my $j=0 ; $j<$MAXMIN ; $j++ ) {
printf "%s %sn",$j,$vect[$j];
}
print "fine ".qx/'date'/;
ld12 - imolug pvb265

31. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter #!/usr/bin/perl -w
.. basics by examples
.. not to do my $MAXMIN=1440;
. thank's Larry my $LOGFILE=shift();
my @vect;
print "Inizializzazione ".qx/'date'/;
for ( my $i=0 ; $i<$MAXMIN ; $i++ ) { $vect[$i]=0; }
print "Analisi File ".qx/'date'/;
open FILE, "<", $LOGFILE or die $!;
while (<FILE>) {
my @field=split(',',$_);
my ($d0, $hour, $minute, $d1)=split(':',$field[3]);
my $minutes=$hour*60+$minute;
$vect[$minutes]++;
}
close (FILE);
print "risultati ".qx/'date'/;
for ( my $j=0 ; $j<$MAXMIN ; $j++ ) {
printf "%s %sn",$j,$vect[$j];
}
print "fine ".qx/'date'/;
ld12 - imolug pvb265

32. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter
.. basics by examples
.. not to do
. thank's Larry 8000
7000
6000
5000
f(x) = 4.63x - 0.06
4000 native
Linear (native)
3000
perl
2000 Linear (perl)
1000 f(x) = 0.02x + 0.44
0
68,000
132,000
196,000
388,000
452,000
516,000
708,000
772,000
836,000
1,028,000
1,092,000
1,156,000
1,220,000
1,284,000
1,348,000
1,412,000
4,000
260,000
324,000
580,000
644,000
900,000
964,000
only 8 seconds for 600.000 requests
just in time analisys came true
ld12 - imolug pvb265

33. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter
.. basics by examples
.. not to do
. thank's Larry 8000
7000
6000
5000
f(x) = 4.63x - 0.06
4000 native
Linear (native)
3000
perl
2000 f(x)=mx+q Linear (perl)
1000 f(x) = 0.02x + 0.44
0 fnative(x)=4,63x – 0,06
68,000
132,000
196,000
388,000
452,000
516,000
708,000
772,000
836,000
1,028,000
1,092,000
1,156,000
1,220,000
1,284,000
1,348,000
1,412,000
4,000
260,000
324,000
580,000
644,000
900,000
964,000
fperl(x)=0,02x – 0,44
4,63/0,02=231,5
only 8 seconds for 600.000 requests
just in time analisys came true
ld12 - imolug pvb265

34. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
Python Ruby Perl C
.. perl genesis
.. compiler vs interpreter
.. basics by examples
.. not to do Version 1.5.2 1.4.5 5.0pl5sv3 egcs-1.1.2
. thank's Larry
GC Style RefCount GC RefCount None
Tested-on 2000-07-19 2000-07-19 2001-04-18 2001-04-18
loop_test(500.000) 33.94 17.16 18.95 0.16
index_test(1.000.000) 17.64 26.49 23.83 1.44
nested_int_test(23) 43.55 84.95 27.69 0.09
Returntest(5.000.000) 74.31 53.02 156.24 0.42
Functest(5.000.000) 63.85 53.84 106.24 0.39
file_line_test 9.53 27.87 9.88 1.50
file_line_split_test 44.80 n/a 35.35 7.28
file_line_re_test 294.83 n/a 43.86 n/a
http://dj1.willowmail.com/~jeske/Projects/ScriptPerf/
ld12 - imolug pvb265

35. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
Python Ruby Perl C
.. perl genesis
.. compiler vs interpreter
.. basics by examples
.. not to do Version 1.5.2 1.4.5 5.0pl5sv3 egcs-1.1.2
. thank's Larry
GC Style RefCount GC RefCount None
Tested-on 2000-07-19 2000-07-19 2001-04-18 2001-04-18
loop_test(500.000) 33.94 17.16 18.95 0.16
Perform two nested loops, the
outer loop of 500.000 iterations
index_test(1.000.000) 17.64 26.49 23.83 1.44 and the inner of 10 iterations
nested_int_test(23) 43.55 84.95 27.69 0.09 Nested Loops
Returntest(5.000.000) 74.31 53.02 156.24 0.42
Functest(5.000.000) 63.85 53.84 106.24 0.39
file_line_test 9.53 27.87 9.88 1.50
file_line_split_test 44.80 n/a 35.35 7.28
file_line_re_test 294.83 n/a 43.86 n/a
http://dj1.willowmail.com/~jeske/Projects/ScriptPerf/
ld12 - imolug pvb265

36. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
Python Ruby Perl C
.. perl genesis
.. compiler vs interpreter
.. basics by examples
.. not to do Version 1.5.2 1.4.5 5.0pl5sv3 egcs-1.1.2
. thank's Larry
GC Style RefCount GC RefCount None
Tested-on 2000-07-19 2000-07-19 2001-04-18 2001-04-18
loop_test(500.000) 33.94 17.16 18.95 0.16
index_test(1.000.000) 17.64 26.49 23.83 1.44 Write 1.000.000 elements into
hash-table and read then
nested_int_test(23) 43.55 84.95 27.69 0.09 back
Hash Table
Returntest(5.000.000) 74.31 53.02 156.24 0.42
Functest(5.000.000) 63.85 53.84 106.24 0.39
file_line_test 9.53 27.87 9.88 1.50
file_line_split_test 44.80 n/a 35.35 7.28
file_line_re_test 294.83 n/a 43.86 n/a
http://dj1.willowmail.com/~jeske/Projects/ScriptPerf/
ld12 - imolug pvb265

37. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
Python Ruby Perl C
.. perl genesis
.. compiler vs interpreter
.. basics by examples
.. not to do Version 1.5.2 1.4.5 5.0pl5sv3 egcs-1.1.2
. thank's Larry
GC Style RefCount GC RefCount None
Tested-on 2000-07-19 2000-07-19 2001-04-18 2001-04-18
loop_test(500.000) 33.94 17.16 18.95 0.16
index_test(1.000.000) 17.64 26.49 23.83 1.44
nested_int_test(23) 43.55 84.95 27.69 0.09 Five level of nested loops each of
23 iteration and at each level
some simple arithmetic operation
Returntest(5.000.000) 74.31 53.02 156.24 0.42
on a local variable
Functest(5.000.000) 63.85 53.84 106.24 0.39
Nested Loops
+ Arithmetics on
file_line_test 9.53 27.87 9.88 1.50
Local Vars
file_line_split_test 44.80 n/a 35.35 7.28
file_line_re_test 294.83 n/a 43.86 n/a
http://dj1.willowmail.com/~jeske/Projects/ScriptPerf/
ld12 - imolug pvb265

38. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
Python Ruby Perl C
.. perl genesis
.. compiler vs interpreter
.. basics by examples
.. not to do Version 1.5.2 1.4.5 5.0pl5sv3 egcs-1.1.2
. thank's Larry
GC Style RefCount GC RefCount None
Tested-on 2000-07-19 2000-07-19 2001-04-18 2001-04-18
loop_test(500.000) 33.94 17.16 18.95 0.16
index_test(1.000.000) 17.64 26.49 23.83 1.44
nested_int_test(23) 43.55 84.95 27.69 0.09
Returntest(5.000.000) 74.31 53.02 156.24 0.42 Test the cost of multiple argument
return by performing 5.000.000
Functest(5.000.000) 63.85 106.24 Function call which return
53.84 0.39
Arguments unpacked into local
variables
file_line_test 9.53 27.87 9.88 1.50
Return Arguments
file_line_split_test 44.80 n/a 35.35 7.28
file_line_re_test 294.83 n/a 43.86 n/a
http://dj1.willowmail.com/~jeske/Projects/ScriptPerf/
ld12 - imolug pvb265

39. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
Python Ruby Perl C
.. perl genesis
.. compiler vs interpreter
.. basics by examples
.. not to do Version 1.5.2 1.4.5 5.0pl5sv3 egcs-1.1.2
. thank's Larry
GC Style RefCount GC RefCount None
Tested-on 2000-07-19 2000-07-19 2001-04-18 2001-04-18
loop_test(500.000) 33.94 17.16 18.95 0.16
index_test(1.000.000) 17.64 26.49 23.83 1.44
nested_int_test(23) 43.55 84.95 27.69 0.09
Returntest(5.000.000) 74.31 53.02 156.24 0.42 Test the cost of function calls by
Performing 5.000.000 function calls
Functest(5.000.000) 63.85 106.24 with one integer argument which
53.84 0.39
returns that argument
file_line_test 9.53 27.87 9.88 1.50
Functions Calling
file_line_split_test 44.80 n/a 35.35 7.28
file_line_re_test 294.83 n/a 43.86 n/a
http://dj1.willowmail.com/~jeske/Projects/ScriptPerf/
ld12 - imolug pvb265

40. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
Python Ruby Perl C
.. perl genesis
.. compiler vs interpreter
.. basics by examples
.. not to do Version 1.5.2 1.4.5 5.0pl5sv3 egcs-1.1.2
. thank's Larry
GC Style RefCount GC RefCount None
Tested-on 2000-07-19 2000-07-19 2001-04-18 2001-04-18
loop_test(500.000) 33.94 17.16 18.95 0.16
index_test(1.000.000) 17.64 26.49 23.83 1.44
nested_int_test(23) 43.55 84.95 27.69 0.09
Returntest(5.000.000) 74.31 53.02 156.24 0.42
Functest(5.000.000) 63.85 53.84 106.24 0.39
file_line_test 9.53 27.87 9.88 1.50
Time spent opening the file and
reading it line by line
file_line_split_test 44.80 n/a 35.35 7.28
Reading File
file_line_re_test 294.83 n/a 43.86 n/a
http://dj1.willowmail.com/~jeske/Projects/ScriptPerf/
ld12 - imolug pvb265

41. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
Python Ruby Perl C
.. perl genesis
.. compiler vs interpreter
.. basics by examples
.. not to do Version 1.5.2 1.4.5 5.0pl5sv3 egcs-1.1.2
. thank's Larry
GC Style RefCount GC RefCount None
Tested-on 2000-07-19 2000-07-19 2001-04-18 2001-04-18
loop_test(500.000) 33.94 17.16 18.95 0.16
index_test(1.000.000) 17.64 26.49 23.83 1.44
nested_int_test(23) 43.55 84.95 27.69 0.09
Returntest(5.000.000) 74.31 53.02 156.24 0.42
Functest(5.000.000) 63.85 53.84 106.24 0.39
Reading Line by Line
file_line_test 9.53 27.87 9.88 1.50 and Splitting
file_line_split_test 44.80 n/a 35.35 7.28
Time spent opening the file and
reading it line by line splitting each
file_line_re_test 294.83 n/a 43.86 n/a line in token vector
http://dj1.willowmail.com/~jeske/Projects/ScriptPerf/
ld12 - imolug pvb265

42. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
Python Ruby Perl C
.. perl genesis
.. compiler vs interpreter
.. basics by examples
.. not to do Version 1.5.2 1.4.5 5.0pl5sv3 egcs-1.1.2
. thank's Larry
GC Style RefCount GC RefCount None
Tested-on 2000-07-19 2000-07-19 2001-04-18 2001-04-18
loop_test(500.000) 33.94 17.16 18.95 0.16
index_test(1.000.000) 17.64 26.49 23.83 1.44
nested_int_test(23) 43.55 84.95 27.69 0.09
Returntest(5.000.000) 74.31 53.02 156.24 0.42
Reading Line by Line
Functest(5.000.000) 63.85 53.84 106.24 0.39
and Splitting +
Conditional Operations
file_line_test 9.53 27.87 9.88 1.50
Time spent opening the file and
file_line_split_test 44.80 n/a 35.35 7.28 reading it line by line, splitting each
line in token vector with simple
conditional analisys and
file_line_re_test 294.83 n/a 43.86 n/a
assegnation to local variables
http://dj1.willowmail.com/~jeske/Projects/ScriptPerf/
ld12 - imolug pvb265

43. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
Python Ruby Perl C
.. perl genesis
.. compiler vs interpreter
.. basics by examples
.. not to do Version 1.5.2 1.4.5 5.0pl5sv3 egcs-1.1.2
. thank's Larry
GC Style RefCount GC RefCount None
Tested-on 2000-07-19 2000-07-19 2001-04-18 2001-04-18
loop_test(500.000) 33.94 17.16 18.95 0.16
index_test(1.000.000) 17.64 26.49 23.83 1.44
nested_int_test(23) 43.55 84.95 27.69 0.09
reding file,
Returntest(5.000.000) 74.31 53.02 156.24 0.42
manipulating strings,
Functest(5.000.000) 63.85 53.84 106.24 0.39 loops and operations
file_line_test 9.53 27.87 9.88 1.50
file_line_split_test 44.80 n/a 35.35 7.28
file_line_re_test 294.83 n/a 43.86 n/a
http://dj1.willowmail.com/~jeske/Projects/ScriptPerf/
ld12 - imolug pvb265

44. needs that lead to the camel LD12
faster way
Perl genesis
ld12 - imolug pvb265

45. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter
.. basics by examples
.. not to do
. thank's Larry
Larry Wall 1954 bachelor's degree in Natural and Artificial Languages
Practical Extraction and Report Language
Pathologically Eclectic Rubbish Lister Laziness, Impatience and Hubris
1987
http://www.linuxjournal.com/article/3394
ld12 - imolug pvb265

46. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter Naming it Perl Practical Extraction and Report Language
.. basics by examples
.. not to do perl / Perl programm/Language
. thank's Larry imperfect ”Perl was never designed to be perfect”
adaptive “Over-specialization is only as good as your ecological niche”
Perl 1.0 18 december 1987 newsgroup: comp.sources.misc
Perl 2.0 1988 feature: better regular expression engine
Perl 3.0 1989 feature: binary data streams
Perl 4.0 1991 well documented, published Programming Perl (aka Camel Book)
Perl 5.000 17 october 1994 extending the language without modifying the core interpreter
Perl 5.001 13 march 1995
CPAN 26 october 1995 comprehensive perl archive network
Perl 5.002 29 february 1996 feature: subroutine
Perl 5.003 25 june 1996 security release
Perl 5.004 15 may 1997
Perl 5.005 22 july 1998
http://www.linuxjournal.com/article/3394
ld12 - imolug pvb265

47. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter Naming it Perl Practical Extraction and Report Language
.. basics by examples
.. not to do perl / Perl programm/Language
. thank's Larry imperfect ”Perl was never designed to be perfect”
adaptive “Over-specialization is only as good as your ecological niche”
Perl 5.6 22 march 2000 feature: 64bit support, unicode, large file support
Perl 6.0 19 july 2000 first announced by Larry in “State of the Onion 2000” talk
Perl 5.10 18 december 2007 20th anniversary
Perl 5.12 now
http://www.linuxjournal.com/article/3394
ld12 - imolug pvb265

48. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter Naming it Perl Practical Extraction and Report Language
.. basics by examples
.. not to do perl / Perl programm/Language
. thank's Larry imperfect ”Perl was never designed to be perfect”
adaptive “Over-specialization is only as good as your ecological niche”
Perl history realease from 1.0 to 5.12 (6.0)
main characteristics
text-processing language modular
glues for interstices
UNICODE to be worldwide useful flexible
http://www.linuxjournal.com/article/3394
ld12 - imolug pvb265

49. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter Naming it Perl Practical Extraction and Report Language
.. basics by examples
.. not to do perl / Perl programm/Language
. thank's Larry imperfect ”Perl was never designed to be perfect”
adaptive “Over-specialization is only as good as your ecological niche”
Perl history realease from 1.0 to 5.12 (6.0)
main characteristics
text-processing language modular
gluesthe interstices
for only
POST-MODERN flexible
UNICODE to be worldwide useful
language
http://www.linuxjournal.com/article/3394
ld12 - imolug pvb265

50. needs that lead to the camel LD12
faster way
compiler vs interpreter
ld12 - imolug pvb265

51. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter
.. basics by examples
.. not to do
. thank's Larry
A compiler is a program that reads code
written in one source language and translate it
into the same written in a second language
ld12 - imolug pvb265

52. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter
.. basics by examples
position := initial + rate * 60
.. not to do
. thank's Larry
ld12 - imolug pvb265

53. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter
.. basics by examples
:=
.. not to do
. thank's Larry position initial + rate * 60
ld12 - imolug pvb265

54. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter
.. basics by examples
:=
.. not to do
. thank's Larry position +
initial rate * 60
ld12 - imolug pvb265

55. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter
.. basics by examples
:=
.. not to do
. thank's Larry position +
initial *
rate 60
ld12 - imolug pvb265

56. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter
.. basics by examples
:=
.. not to do
. thank's Larry position +
initial *
rate 60
ld12 - imolug pvb265

57. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter
.. basics by examples
:=
.. not to do
. thank's Larry position +
initial *
rate 60
syntax check syntax check
optimization optimization
executable execute
ld12 - imolug pvb265

58. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter
.. basics by examples
:=
.. not to do
. thank's Larry position +
initial *
rate 60
compiler interpreter
syntax check syntax check
optimization optimization
executable execute
ld12 - imolug pvb265

59. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter
.. basics by examples
:=
.. not to do
. thank's Larry position +
initial *
rate 60
compiler like Java interpreter
syntax check syntax check syntax check
optimization optimization optimization
bytecode
executable VM per SO execute
execute
ld12 - imolug pvb265

60. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter
.. basics by examples
.. not to do
. thank's Larry
compiler C C++ Pascal PL/1
like Java Java
interpreter Bash Basic Lisp Javascript
ld12 - imolug pvb265

61. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter
.. basics by examples
.. not to do
. thank's Larry
compiler C C++ Pascal PL/1
like Java Java
interpreter Perl
Bash Basic Lisp Javascript
ld12 - imolug pvb265

62. needs that lead to the camel LD12
faster way
basics by examples
ld12 - imolug pvb265

63. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter
.. basics by examples
.. not to do
. thank's Larry
We can't condense the specifications
of a language in a few slides, but You can fall
in love seeing some simple examples.
ld12 - imolug pvb265

64. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter Data Type Data Structure
.. basics by examples
.. not to do Predefined Variable Running
. thank's Larry
Loop and Condition
String Manipulation IO function
System Interaction
ld12 - imolug pvb265

65. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter Data Type Data Structure
.. basics by examples
.. not to do Predefined Variable Running
. thank's Larry
Loop and Condition
String Manipulation IO function
System Interaction
dynamically typed
undef value
my $MAXMIN=1440;
my $j=0;
my $name=”Valerio”;
ld12 - imolug pvb265

66. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter Data Type Data Structure
.. basics by examples
.. not to do Predefined Variable Running
. thank's Larry
Loop and Condition
String Manipulation IO function
System Interaction
@array %hash
my @vect; my %vect;
my $vect[$i]=0; my %vect{'sun'}='sunday';
my %vect{'mon'}='monday';
foreach $element (@vect) { foreach $key (keys %vect) {
print “$elementn”; print “$key = $vect{$key}n”;
} }
print scalar(@vect);
ld12 - imolug pvb265

67. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter Data Type Data Structure
.. basics by examples
.. not to do Predefined Variable Running
. thank's Larry
Loop and Condition
String Manipulation IO function
System Interaction
$_ default input
$! current error
$$ process number
$ARGV number of parameter
@ARGV parameter
@_ subroutine parameter
open FILE, "<", $LOGFILE or die $!;
my @field=split(',',$_);
ld12 - imolug pvb265

68. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter Data Type Data Structure
.. basics by examples
.. not to do Predefined Variable Running
. thank's Larry
Loop and Condition
String Manipulation IO function
System Interaction
perl in line
execution of an interpreter
script self interpreting
>perl -e “print '$$'; print 'Hi pvb265!'; ”;
>cat test2.pl
print '$$'; >cat test3.pl
print 'Hi pvb265'; #!/usr/bin/perl
print '$$';
>perl test2.pl print 'Hi pvb265';
>test3.pl
ld12 - imolug pvb265

69. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter Data Type Data Structure
.. basics by examples
.. not to do Predefined Variable Running
. thank's Larry
Loop and Condition
String Manipulation IO function
System Interaction
if (condition) { code } elsif (condition) { code } else { code } ;
for (start,condition,increment) {code};
while (condition) {code};
for ( my $i=0 ; $i<$MAXMIN ; $i++ ) { $vect[$i]=0; };
while (<FILE>) {
print $_;
}
if ( $tmp /^0101/ ) { print “matched”; }
print “matched” if ( $tmp /^0101/ );
ld12 - imolug pvb265

70. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter Data Type Data Structure
.. basics by examples
.. not to do Predefined Variable Running
. thank's Larry
Loop and Condition
String Manipulation IO function
System Interaction
vector = split(char,string);
chomp($_);
string =~ s/old/new/g;
my @field=split(',',$_);
my ($d0, $hour, $minute, $d1)=split(':',$field[3]);
$d0 =~ s/00/1/g;
ld12 - imolug pvb265

71. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter Data Type Data Structure
.. basics by examples
.. not to do Predefined Variable Running
. thank's Larry
Loop and Condition
String Manipulation IO function
System Interaction
close(filehandler);
open filehandler, mode, filename;
open FILE, "<", $LOGFILE or die $!;
while (<FILE>) {
my @field=split(',',$_);
my ($d0, $hour, $minute, $d1)=split(':',$field[3]);
my $minutes=$hour*60+$minute;
$vect[$minutes]++;
} open FILE, "<", $LOGFILE or die $!;
close (FILE); @lines = <FILE>;
close (FILE);
Foreach (@lines) {
my @field=split(',',$_);
my ($d0, $hour, $minute, $d1)=split(':',$field[3]);
my $minutes=$hour*60+$minute;
$vect[$minutes]++;
}
ld12 - imolug pvb265

72. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter Data Type Data Structure
.. basics by examples
.. not to do Predefined Variable Running
. thank's Larry
Loop and Condition
String Manipulation IO function
System Interaction
system(cmdstring);
`cmdstring`;
qx/cmdstring/;
my $cmd = “generatex509 pvb265”;
system($cmd);
print $?; my $cmd = “generatex509 pvb265”;
@lines=`$cmd`;
print @lines;
print $?;
my $cmd = “generatex509 pvb265”;
@lines=qx/$cmd/;
print @lines;
print $?;
ld12 - imolug pvb265

73. needs that lead to the camel LD12
faster way
not to do
ld12 - imolug pvb265

74. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter
.. basics by examples
.. not to do
. thank's Larry
never put sands in your
favorite diesel engine!
ld12 - imolug pvb265

75. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter
.. basics by examples
.. not to do
. thank's Larry
also Perl may appear slow if U ...
choose a slow algorithm
don't properly use structured data
Huge array of array of array...
Huge hash of array of hash...
LW 'Doing linear scans over an associative array is like
trying to club someone to death with a loaded Uzi'
don't use regexps
ld12 - imolug pvb265

76. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter
.. basics by examples
.. not to do
. thank's Larry
also Perl may appear slow if U ...
choose a slow algorithm
hexadecimal → decimal
perl -e'print map {hex $_} "547261aa696e6720ff74796c652f6dff" =~ /(....)/g;'
perl -e'print unpack "n*",pack "H*", "547261aa696e6720ff74796c652f6dff";'
21618 25002 26990 26400 65396 31084 25903 28159
ld12 - imolug pvb265

77. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter
.. basics by examples
.. not to do
. thank's Larry
also Perl may appear slow if U ...
choose a slow algorithm
hexadecimal → decimal
perl -e'print map {hex $_} "547261aa696e6720ff74796c652f6dff" =~ /(....)/g;'
valeriobalbi$ perl -MO=Terse -e'print map {hex $_} "54726164696e67207374796c652f6d61" =~ /(....)/g;'
LISTOP (0x102ff7e20) leave [1]
OP (0x102f02f90) enter
COP (0x102ff7dd0) nextstate
LISTOP (0x102ffbbd0) print
OP (0x102ffbc10) pushmark
LOGOP (0x102ffbb60) mapwhile [3]
LISTOP (0x102ffba80) mapstart
OP (0x102ffbac0) pushmark
UNOP (0x102ffbba0) null
UNOP (0x102ff2ef0) null
LISTOP (0x102f09350) scope
OP (0x102f1f020) null [181]
UNOP (0x102f09940) hex [2]
UNOP (0x102f092a0) null [15]
PADOP (0x102f02640) gvsv GV (0x7fdcf1803e28) *_
PMOP (0x102f09410) match
SVOP (0x102f094d0) const [4] PV (0x7fdcf1829070) "54726164696e67207374796c652f6d61"
-e syntax OK
ld12 - imolug pvb265

78. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter
.. basics by examples
.. not to do
. thank's Larry
also Perl may appear slow if U ...
choose a slow algorithm
hexadecimal → decimal
perl -e'print unpack "n*",pack "H*", "547261aa696e6720ff74796c652f6dff";'
valeriobalbi$ perl -MO=Terse -e'print unpack "n*",pack "H*", "547261aa696e6720ff74796c652f6dff";'
LISTOP (0x7fd692cfbab0) leave [1]
OP (0x7fd692c02f90) enter
COP (0x7fd692c1f040) nextstate
LISTOP (0x7fd692c09430) print
OP (0x7fd692cfba80) pushmark
LISTOP (0x7fd692c093c0) unpack
OP (0x7fd692c09400) null [3]
SVOP (0x7fd692c02640) const [2] PV (0x7fd693029058) "n*"
LISTOP (0x7fd692c094d0) pack [1]
OP (0x7fd692cf2ef0) pushmark
SVOP (0x7fd692c092a0) const [3] PV (0x7fd693029070) "H*"
SVOP (0x7fd692c09350) const [4] PV (0x7fd693029088) "547261aa696e6720ff74796c652f6dff"
-e syntax OK
ld12 - imolug pvb265

79. needs that lead to the camel LD12
thank's Lar r y
thank's Angel
I'm not fired!
ld12 - imolug pvb265

80. a genda
. scenario
.. not to do
. faster way
ld12 - imolug
.. perl genesis
. thank's Larry
. canonical way
.. basics by examples
.. compiler vs interpreter
pvb265
0
500
1000
1500
2000
2500
3000
00.02.00
00.44.00
01.26.00
02.08.00
02.50.00
03.32.00
04.14.00
04.56.00
05.38.00
06.20.00
07.02.00
07.44.00
08.26.00
09.08.00
09.50.00
10.32.00
11.14.00
11.56.00
12.38.00
13.20.00
14.02.00
14.44.00
15.26.00
16.08.00
16.50.00
17.32.00
18.14.00
18.56.00
….back to the original problem
19.38.00
20.20.00
21.02.00
21.44.00
22.26.00
23.08.00
23.50.00
req
needs that lead to the camel LD12

81. a genda
. scenario
.. not to do
. faster way
ld12 - imolug
.. perl genesis
. thank's Larry
. canonical way
.. basics by examples
.. compiler vs interpreter
pvb265
0
500
1000
1500
2000
2500
3000
00.02.00
00.44.00
01.26.00
02.08.00
02.50.00
03.32.00
04.14.00
04.56.00
05.38.00
06.20.00
07.02.00
07.44.00
08.26.00
09.08.00
09.50.00
10.32.00
11.14.00
11.56.00
12.38.00
13.20.00
14.02.00
14.44.00
15.26.00
16.08.00
16.50.00
17.32.00
18.14.00
18.56.00
….back to the original problem
19.38.00
20.20.00
21.02.00
21.44.00
22.26.00
23.08.00
23.50.00
req
needs that lead to the camel LD12

82. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter
.. basics by examples
ggi-reporter is more than a project in Perl
.. not to do
. thank's Larry
ld12 - imolug pvb265

83. a genda needs that lead to the camel LD12
. scenario
. canonical way
. faster way
.. perl genesis
.. compiler vs interpreter
.. basics by examples
.. not to do
Question Time
. thank's Larry
Valerio Balbi @pvb265 http://www.valeriobalbi.eu
skype:pvb265 valerio.balbi@gmail.com
Bologna - scienze dell'Informazione 1998
Coofounder ImoLUG senior sysadm
sysadm security banking e-commerce
ld12 - imolug pvb265