Why bother with the timing in the first place? RRD is designed to handle exactly that. As the man page says: "The data is time aligned (interpolated) according to the properties of the RRD to which the data is written."

And, from the same author, there is the excellent smokeping which does all that...

In reply to Re: RRD-Ping getting values on right interval by pklausner
in thread RRD-Ping getting values on right interval by hello_world

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