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sub mping {
    my $mypid = $$;
    print "debug mping\nmy pid is $mypid\n";
...
    }
    return \%results;
}

pinging 6 IPs...
debug mping
my pid is 13884
...
30 31 32 33 34 35 36 37 38 40 41 42 43 44 45 46 47 49 50 52 53 55 56 5
+8 59

.....etc.....