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SlidingHistogram

feldera_storage::histogram

Struct SlidingHistogram 

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pub struct SlidingHistogram { /* private fields */ }
Expand description

A sliding histogram with exponential buckets.

This histogram records up to a specified number of samples across a specified maximum amount of time. Within that range, it maintains an exponential histogram with the same form as ExponentialHistogram.

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impl SlidingHistogram

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pub const fn new(max_samples: usize, max_elapsed: Duration) -> Self

Constructs a new sliding histogram. The histogram will keep at most the most recent max_samples samples that have been recorded over at most the most recent max_elapsed amount of time.

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pub fn record(&mut self, value: impl TryInto<u64>)

Records value in the histogram.

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pub fn record_elapsed(&mut self, start: Instant)

Records the time elapsed since start in the histogram, as a count of microseconds.

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pub fn snapshot(&mut self) -> ExponentialHistogramSnapshot

Returns a snapshot of the histogram.

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pub fn sum(&self) -> u64

Returns the sum of the values in the histogram

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pub fn record_callback<F, T>(&mut self, f: F) -> T
where F: FnOnce() -> T,

Calls f and records the amount of time that it takes to run, in microseconds, in the histogram.

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impl Debug for SlidingHistogram

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

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