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Long running program with interaction
this example from a Well House Consultants training course
Source code: h1 Module: P305
# Long running program with interaction # - Reports progress to STDERR # - Traps ^C to avoid it killing the program # - accepts a signal to cause it to give an intermediate result use strict; use warnings; use English; use Hit; $SIG{"INT"} = \&nodie; $SIG{"TERM"} = \&nodie; $SIG{"USR1"} = \&tell; our $lasttime = 0; our $pinged = 0; our $verbose = 0; my @met1 = times(); sub nodie { $pinged++; } sub tell { $verbose++; } sub react { my $thistime = time(); if ($thistime - $lasttime < 6) { print "\n"; exit(); } print "\nPlease do that again quickly\n"; $lasttime = $thistime; $pinged-- ; } my $fname = "huge.txt"; open FH,$fname or die; my $syze = -s $fname; my $bytes = 0; my @interest = (); our $lines = 0; our $found = 0; my $start = time(); my $from = localtime($start); print "My program is $0\n"; print "My program is $PROGRAM_NAME $PID $]\n"; open (FHX,">/tmp/huge.pid"); print FHX "$PID\n"; close FHX; while (<FH>) { # Scalar context, line by line. NOT foreach! $bytes += length; my $access = new Hit($_); $lines++; if ($access->isaSearch()) { $found++; } push @interest,$access; select STDERR; $| = 1; select STDOUT; my $now = time(); my $runfor = $now - $start; my $percent = $bytes * 100 / $syze; printf STDERR ("Processed %12d lines in %6d secs. %6.2f%% done\r", $lines, $runfor, $percent) if ($lines % 80000 == 0); if ($percent > 0) { my $estimate = $runfor * 100 / $percent; my $to = localtime($start + $estimate); printf STDERR ("From %20s to % 20s\r", $from,$to) if ($lines % 80000 == 40000); } react() if ($pinged>0); talk() if ($verbose>0); } print STDERR "\n"; print "Found $found out of $lines\n"; sub talk { $verbose = 0; print "\n"; print "So far matched $found in $lines\n"; } sub byterm { our %timesaver; if (! $timesaver{$a} or 1 == 1) { my $x1 = $a -> getsearch(); $x1 =~ s/^\s+//; $x1 =~ s/\s+$//; my @x1f = reverse(split(/\s+/,$x1)); my $jx1 = join(" ",@x1f); $timesaver{$a} = $jx1; } if (! $timesaver{$b} or 1 == 1) { my $x2 = $b -> getsearch(); $x2 =~ s/^\s+//; $x2 =~ s/\s+$//; my @x2f = reverse(split(/\s+/,$x2)); my $jx2 = join(" ",@x2f); $timesaver{$b} = $jx2; } return $timesaver{$a} cmp $timesaver{$b}; } my $elapsed = time() - $start; my @met2 = times(); print "Elapsed time $elapsed\n"; print "@met1\n@met2\n"; my @sinter = sort byterm (@interest) ; my $k = 0; foreach my $sample (@sinter) { if ($sample->isaSearch() ) { print $sample->getsearch(),"\n"; $k++; } last if ($k>198) ; } my @met3 = times(); print "@met1\n@met2\n@met3\n"; __END__ ** Renning that - WITH caching munchkin:j11pl grahamellis$ perl h1 Copyright me, this year My program is h1 My program is h1 151 5.008009 Processed 800000 lines in 36 secs. 97.40% done Found 41621 out of 822244 Elapsed time 37 0.01 0 0 0 34.85 1.52 0 0 ksh !ne invalid command name " " set prompt "(%|\\\$|#) " expect interact can not find channel named " return " perl substitute " [etc] perl $_ perl $_ 0.01 0 0 0 34.85 1.52 0 0 62.2 1.79 0 0 WITHOUT caching - takes 20 seconds longer! perl $_ 0.01 0 0 0 34.88 1.56 0 0 82.19 1.82 0 0 Learn about this subject
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