#
# calculate the average, avoiding any division by zero traps
#
my $avg_cpu_load = $total_cpu_load ? $total_cpu_load / $active_pid_num
+ : 0 ;
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I'd think if you want to avoid division by zero, you'd need to check the denominator for zero-ness rather than the numerator. That is:

my $avg_cpu_load = $active_pid_num ? $total_cpu_load / $active_pid_num
+ : 0;
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Or am I misunderstanding something here?