in reply to Live operations-per-second counter

I like the alarm idea. But using threads would be even better. 
use strict;

use Time::HiRes qw ( alarm time usleep sleep);

our $starttime;
our $lasttime;
our $linecount = 0;
our $lastlinecount = 0;

$SIG{ALRM} = sub {
        my $now = time;
        printf "\rline %d %8.1f avg lines per second %8.1f lines per s
+econd",
          $linecount, $linecount/($now - $starttime),
          ($linecount - $lastlinecount) 
            / ($now - $lasttime);
        $lasttime = time();
        $lastlinecount = $linecount;
    };

alarm(1, .5);
$| = 1;

$lasttime = $starttime = time();
while (1) {
    $linecount++;
    last if $linecount > 9999;
    usleep(0.001);
};
print "\n";
alarm(0);
$SIG{ALRM} = undef;

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Re^2: Live operations-per-second counter
by gam3 (Curate) on Mar 21, 2005 at 18:33 UTC
    And here is that threaded solution. 
    use strict;

use Config;
$Config{useithreads} or die "Recompile Perl with threads to run this p
+rogram.";

use threads;
use threads::shared;

use Time::HiRes qw ( time sleep);

our $starttime : shared;
our $linecount : shared = 0;
our $running : shared = 1;

sub progress {
    my $lasttime = $starttime;
    my $lastlinecount = 0;
    sleep(1);
    $| = 1;
    do {
        my $now = time();
        printf "\rline %d %8.1f avg lines per second %8.1f lines per s
+econd", $linecount, $linecount/($now - $starttime), ($linecount - $la
+stlinecount) / ($now - $lasttime);
        $lasttime = time();
        $lastlinecount = $linecount;
        sleep(.5);
    } while ($running);
};

$starttime = time();

our $thr1 = threads->new(\&progress);

while (1) {
    $linecount++;
    last if $linecount > 9999;
    sleep(0.001);
};
print "\n";
$running = 0;

$thr1->join();

    [download]
    -- gam3
    A picture is worth a thousand words, but takes 200K.
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