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$ systemctl status chronyd
● chronyd.service - NTP client/server
   Loaded: loaded (/usr/lib/systemd/system/chronyd.service; enabled; v
+endor preset: enabled)
...

$ systemctl status ntpd
Unit ntpd.service could not be found.

use strict;
use warnings;
use Time::HiRes qw/time sleep/;
...
    }
    return @time_test;
}