They cost the same, both need to scan all samples in the range for counter resets.
In fact, the code for the two functions is identical. The only difference is when it's `rate()`, the resulting value is divided by the number of seconds in the range. https://github.com/prometheus/prometheus/blob/291ab4d0bc6ea9f0e61073f303bd3982e9727b8d/promql/functions.go#L152-L154 On Mon, Apr 3, 2023 at 4:14 PM Johny <[email protected]> wrote: > In terms of samples fetched from the DB which is a cost limiting factor in > our set up, what is the overhead of rate() compared to increase(). Based on > my reading so far, rate() requires all data points within the time range > interval thus it will fetch all data points from storage. On the other > hand, the increase() function would fetch the first and last data point + > penultimate data points for interpolation/extrapolation. Is it correct to > state that increase() has lower overhead than rate() in terms of samples > fetched with the overhead scaling up with time range interval? > > thanks > Johny > > -- > You received this message because you are subscribed to the Google Groups > "Prometheus Users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/prometheus-users/c6b65724-696c-4e5a-8606-8e4cfba98b84n%40googlegroups.com > <https://groups.google.com/d/msgid/prometheus-users/c6b65724-696c-4e5a-8606-8e4cfba98b84n%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "Prometheus Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/prometheus-users/CABbyFmpOsb_pT8PSO7C4VtqiB9Bq6ai%2BFHzbFsva3UtHGLZmVQ%40mail.gmail.com.
