[6a3a178] | 1 | import JsHistogram from "./JsHistogram";
|
---|
| 2 | import { PackedArray } from "./packedarray/PackedArray";
|
---|
| 3 | /**
|
---|
| 4 | * <h3>A High Dynamic Range (HDR) Histogram that uses a packed internal representation</h3>
|
---|
| 5 | * <p>
|
---|
| 6 | * {@link PackedHistogram} supports the recording and analyzing sampled data value counts across a configurable
|
---|
| 7 | * integer value range with configurable value precision within the range. Value precision is expressed as the
|
---|
| 8 | * number of significant digits in the value recording, and provides control over value quantization behavior
|
---|
| 9 | * across the value range and the subsequent value resolution at any given level.
|
---|
| 10 | * <p>
|
---|
| 11 | * {@link PackedHistogram} tracks value counts in a packed internal representation optimized
|
---|
| 12 | * for typical histogram recoded values are sparse in the value range and tend to be incremented in small unit counts.
|
---|
| 13 | * This packed representation tends to require significantly smaller amounts of stoarge when compared to unpacked
|
---|
| 14 | * representations, but can incur additional recording cost due to resizing and repacking operations that may
|
---|
| 15 | * occur as previously unrecorded values are encountered.
|
---|
| 16 | * <p>
|
---|
| 17 | * For example, a {@link PackedHistogram} could be configured to track the counts of observed integer values between 0 and
|
---|
| 18 | * 3,600,000,000,000 while maintaining a value precision of 3 significant digits across that range. Value quantization
|
---|
| 19 | * within the range will thus be no larger than 1/1,000th (or 0.1%) of any value. This example Histogram could
|
---|
| 20 | * be used to track and analyze the counts of observed response times ranging between 1 nanosecond and 1 hour
|
---|
| 21 | * in magnitude, while maintaining a value resolution of 1 microsecond up to 1 millisecond, a resolution of
|
---|
| 22 | * 1 millisecond (or better) up to one second, and a resolution of 1 second (or better) up to 1,000 seconds. At its
|
---|
| 23 | * maximum tracked value (1 hour), it would still maintain a resolution of 3.6 seconds (or better).
|
---|
| 24 | * <p>
|
---|
| 25 | * Auto-resizing: When constructed with no specified value range range (or when auto-resize is turned on with {@link
|
---|
| 26 | * Histogram#setAutoResize}) a {@link PackedHistogram} will auto-resize its dynamic range to include recorded values as
|
---|
| 27 | * they are encountered. Note that recording calls that cause auto-resizing may take longer to execute, as resizing
|
---|
| 28 | * incurs allocation and copying of internal data structures.
|
---|
| 29 | * <p>
|
---|
| 30 | */
|
---|
| 31 | declare class PackedHistogram extends JsHistogram {
|
---|
| 32 | packedCounts: PackedArray;
|
---|
| 33 | constructor(lowestDiscernibleValue: number, highestTrackableValue: number, numberOfSignificantValueDigits: number);
|
---|
| 34 | clearCounts(): void;
|
---|
| 35 | incrementCountAtIndex(index: number): void;
|
---|
| 36 | addToCountAtIndex(index: number, value: number): void;
|
---|
| 37 | setCountAtIndex(index: number, value: number): void;
|
---|
| 38 | resize(newHighestTrackableValue: number): void;
|
---|
| 39 | getCountAtIndex(index: number): number;
|
---|
| 40 | protected _getEstimatedFootprintInBytes(): number;
|
---|
| 41 | copyCorrectedForCoordinatedOmission(expectedIntervalBetweenValueSamples: number): PackedHistogram;
|
---|
| 42 | toString(): string;
|
---|
| 43 | }
|
---|
| 44 | export default PackedHistogram;
|
---|