James M Snell a3bb551ea7 perf_hooks: add histogram.diff() ...

Getting the values recorded during an interval requires calling
`reset()`, which removes them for every other user of the histogram,
or copying and subtracting histograms, which silently produces a wrong
result when the source was reset in between.

Add `histogram.diff(other)`, which returns a new read-only `Histogram`
containing the values recorded after `other`, an earlier snapshot of
the histogram, was taken. Neither histogram is changed. Unlike
`subtract()`, it verifies that both histograms have the same layout,
and it throws instead of clamping when `other` contains values that
the histogram does not.

Add `histogram.resetCount`, the number of calls to `reset()` and
`subtract()`, which `snapshot()` copies. `diff()` throws when the
counts differ, so a reset between two snapshots is detected even when
every bucket has since grown past its previous count.

Signed-off-by: James M Snell <jasnell@gmail.com>
Assisted-by: OpenCode
PR-URL: https://github.com/nodejs/node/pull/66099
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>

2026-09-25 03:31:53 +00:00

..

internalBinding

perf_hooks: add histogram.diff()

2026-09-25 03:31:53 +00:00

globals.d.ts

typings: add mksnapshot internal binding types

2026-09-22 03:28:38 +00:00

primordials.d.ts

lib: improve control abstraction coverage in frozen intrinsics

2026-06-13 17:31:17 +00:00