Struct tor_circmgr::timeouts::pareto::History

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struct History {
    time_history: BoundedVecDeque<MsecDuration>,
    time_histogram: BTreeMap<MsecDuration, u16>,
    success_history: BoundedVecDeque<bool>,
}
Expand description

A history of circuit timeout observations, used to estimate our likely circuit timeouts.

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§time_history: BoundedVecDeque<MsecDuration>

Our most recent observed circuit construction times.

For the purpose of this estimator, a circuit counts as “constructed” when a certain “significant” hop (typically the third) is completed.

§time_histogram: BTreeMap<MsecDuration, u16>

A histogram representation of the values in History::time_history.

This histogram is implemented as a sparse map from the center value of each histogram bucket to the number of entries in that bucket. It is completely derivable from time_history; we keep it separate here for efficiency.

§success_history: BoundedVecDeque<bool>

Our most recent circuit timeout statuses.

Each true value represents a successfully completed circuit (all hops). Each false value represents a circuit that timed out after having completed at least one hop.

Implementations§

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impl History

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fn new_empty() -> Self

Initialize a new empty History with no observations.

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fn clear(&mut self)

Remove all observations from this History.

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fn set_success_history_len(&mut self, n: usize)

Change the number of successes to record in our success history to n.

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fn from_sparse_histogram<I>(iter: I) -> Self
where I: Iterator<Item = (MsecDuration, u16)>,

Construct a new History from an iterator representing a sparse histogram of values.

The input must be a sequence of (D,N) tuples, where each D represents a circuit build duration, and N represents the number of observations with that duration.

These observations are shuffled into a random order, then added to a new History.

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fn sparse_histogram(&self) -> impl Iterator<Item = (MsecDuration, u16)> + '_

Return an iterator yielding a sparse histogram of the circuit build time values in this History.

Each histogram entry is a (D,N) tuple, where D is the center of a histogram bucket, and N is the number of observations in that bucket.

Buckets with N=0 are omitted. Buckets are yielded in order.

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fn bucket_center(time: MsecDuration) -> MsecDuration

Return the center value for the bucket containing time.

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fn inc_bucket(&mut self, time: MsecDuration)

Increment the histogram bucket containing time by one.

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fn dec_bucket(&mut self, time: MsecDuration)

Decrement the histogram bucket containing time by one, removing it if it becomes 0.

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fn add_time(&mut self, time: MsecDuration)

Add time to our list of circuit build time observations, and adjust the histogram accordingly.

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fn n_times(&self) -> usize

Return the number of observations in our time history.

This will always be <= TIME_HISTORY_LEN.

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fn add_success(&mut self, succeeded: bool)

Record a success (true) or timeout (false) in our record of whether circuits timed out or not.

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fn n_recent_timeouts(&self) -> usize

Return the number of timeouts recorded in our success history.

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fn n_most_frequent_bins(&self, n: usize) -> Vec<(MsecDuration, u16)>

Helper: return the n most frequent histogram bins.

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fn estimate_xm(&self, n_modes: usize) -> Option<u32>

Return an estimator for the X_m of our Pareto distribution, by looking at the n_modes most frequently filled histogram bins.

It is not a true X_m value, since there are definitely values less than this, but it seems to work as a decent heuristic.

Return None if we have no observations.

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fn pareto_estimate(&self, n_modes: usize) -> Option<ParetoDist>

Compute a maximum-likelihood pareto distribution based on this history, computing X_m based on the n_modes most frequent histograms.

Return None if we have no observations.

Trait Implementations§

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impl Clone for History

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fn clone(&self) -> History

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for History

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

Formats the value using the given formatter. Read more

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