I have a Perl daemon running. It polls a set of rPi input pins, and checks for and replies to, incoming web URL requests. (The web requests are actually txt msgs via Plivo.) This app will run for months at a time. One of the requests returns me a txt with system info, including program and system uptime.

When I request the system info soon after a cold boot, the system uptime will reasonably be some 15 secs earlier than the program uptime. But after about a week, the program uptime will be larger than the system uptime, by about 15 mins! I have not spent effort characterizing this phenomena, but I have observed it several times now.

It's running on an rPi4 running "noobs", aka Linux. I'm using cpan Unix::Uptime->uptime() to get the system uptime, and am using (time - ^T) to get the program uptime.

Thoughts anyone?

In reply to $BASETIME (^T) inaccurate? by MikeL

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