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* Profiler — performance measurement instrumentation.
*
* Maps 1:1 to Python Drain3 profiling system (drain3/simple_profiler.py).
*
* The profiler tracks cumulative time and call counts for named sections
* of the TemplateMiner processing pipeline. It is designed to have
* negligible overhead when profiling is disabled (NullProfiler).
*/
/**
* Profiler interface.
*
* Python: Profiler (abstract base class)
*/
export interface Profiler {
startSection(name: string): void;
endSection(name?: string): void;
report(intervalSec: number): void;
}
// ============================================================
// NullProfiler
// ============================================================
export class NullProfiler implements Profiler {
startSection(_name: string): void {}
endSection(_name?: string): void {}
report(_intervalSec: number): void {}
}
// ============================================================
// ProfiledSectionStats
// ============================================================
/**
* Per-section cumulative timing statistics.
*
* Python: ProfiledSectionStats
*/
class ProfiledSectionStats {
sectionName: string;
startTimeSec: number = 0;
sampleCount: number = 0;
totalTimeSec: number = 0;
sampleCountBatch: number = 0;
totalTimeSecBatch: number = 0;
constructor(sectionName: string) {
this.sectionName = sectionName;
}
toString(
enclosingTimeSec: number,
includeBatchRates: boolean,
): string {
let tookText = `${(this.totalTimeSec * 1000).toFixed(2)} ms`;
if (enclosingTimeSec > 0) {
const pct = (100 * this.totalTimeSec) / enclosingTimeSec;
tookText += ` (${pct.toFixed(2)}%)`;
}
const msPerKSamples = (
(1_000_000 * this.totalTimeSec) /
this.sampleCount
).toFixed(2);
let samplesPerSec: string;
if (this.totalTimeSec > 0) {
samplesPerSec = (this.sampleCount / this.totalTimeSec).toFixed(2);
} else {
samplesPerSec = "N/A";
}
if (includeBatchRates) {
const batchMs = (
(1_000_000 * this.totalTimeSecBatch) /
this.sampleCountBatch
).toFixed(2);
const batchHz =
this.totalTimeSecBatch > 0
? (this.sampleCountBatch / this.totalTimeSecBatch).toFixed(2)
: "N/A";
return (
`${this.sectionName.padEnd(15)}: took ${tookText}, ` +
`${this.sampleCount.toLocaleString().padStart(10)} samples, ` +
`${msPerKSamples} (${batchMs}) ms / 1000 samples, ` +
`${samplesPerSec} (${batchHz}) hz`
);
}
return (
`${this.sectionName.padEnd(15)}: took ${tookText}, ` +
`${this.sampleCount.toLocaleString().padStart(10)} samples, ` +
`${msPerKSamples} ms / 1000 samples, ` +
`${samplesPerSec} hz`
);
}
}
// ============================================================
// SimpleProfiler
// ============================================================
/**
* Simple wall-clock profiler with batch rate support.
*
* Python: SimpleProfiler
*
* Features:
* - Cumulative timing per section
* - Batch rates (reset_after_sample_count)
* - Enclosing section percentage calculation
* - Custom printer function
* - Sorted descending output by total time
* - Hz calculation (samples/sec)
*
* Section nesting is NOT supported. Each startSection must be
* followed by an endSection for the same or last section.
*/
export class SimpleProfiler implements Profiler {
private readonly _sections = new Map<string, ProfiledSectionStats>();
private _lastReportTimestamp: number;
private _lastStartedSectionName: string = "";
private readonly _printer: (msg: string) => void;
private readonly _enclosingSectionName: string;
private readonly _resetAfterSampleCount: number;
/**
* @param resetAfterSampleCount - After this many samples, reset batch counters.
* Batch rates are shown in parentheses. Default: 0 (no batch reset).
* @param enclosingSectionName - Section name for percentage calculation (e.g. "total").
* Default: "total".
* @param printer - Output function. Default: `console.log`.
*/
constructor(
resetAfterSampleCount: number = 0,
enclosingSectionName: string = "total",
printer: (msg: string) => void = console.log,
) {
this._resetAfterSampleCount = resetAfterSampleCount;
this._enclosingSectionName = enclosingSectionName;
this._printer = printer;
this._lastReportTimestamp = performance.now() / 1000;
}
/**
* Begin timing a named section.
*
* Python: SimpleProfiler.start_section(section_name)
*/
startSection(name: string): void {
if (!name) {
throw new Error("Section name is empty");
}
this._lastStartedSectionName = name;
let section = this._sections.get(name);
if (!section) {
section = new ProfiledSectionStats(name);
this._sections.set(name, section);
}
if (section.startTimeSec !== 0) {
throw new Error(`Section "${name}" is already started`);
}
section.startTimeSec = performance.now() / 1000;
}
/**
* End timing for a section.
*
* Python: SimpleProfiler.end_section(name)
*
* @param name - Section name. If omitted, ends the last started section.
*/
endSection(name: string = ""): void {
const now = performance.now() / 1000;
const sectionName = name || this._lastStartedSectionName;
if (!sectionName) {
throw new Error(
"Neither section name is specified nor a section is started",
);
}
const section = this._sections.get(sectionName);
if (!section) {
throw new Error(`Section "${sectionName}" does not exist`);
}
Iif (section.startTimeSec === 0) {
throw new Error(`Section "${sectionName}" was not started`);
}
const tookSec = now - section.startTimeSec;
// Reset batch counters if threshold reached (before incrementing)
if (
this._resetAfterSampleCount > 0 &&
section.sampleCount === this._resetAfterSampleCount
) {
section.sampleCountBatch = 0;
section.totalTimeSecBatch = 0;
}
section.sampleCount += 1;
section.totalTimeSec += tookSec;
section.sampleCountBatch += 1;
section.totalTimeSecBatch += tookSec;
section.startTimeSec = 0;
}
/**
* Output a profiling report at the given interval.
*
* Python: SimpleProfiler.report(period_sec)
*
* @param periodSec - Minimum seconds between reports.
*/
report(periodSec: number = 30): void {
const now = performance.now() / 1000;
if (now - this._lastReportTimestamp < periodSec) return;
this._lastReportTimestamp = now;
// Calculate enclosing time for percentage display
let enclosingTimeSec = 0;
if (this._enclosingSectionName) {
const enclosing = this._sections.get(this._enclosingSectionName);
if (enclosing) {
enclosingTimeSec = enclosing.totalTimeSec;
}
}
const includeBatchRates = this._resetAfterSampleCount > 0;
const sections = [...this._sections.values()];
// Sort descending by total time
sections.sort((a, b) => b.totalTimeSec - a.totalTimeSec);
const lines = sections.map((s) =>
s.toString(enclosingTimeSec, includeBatchRates),
);
this._printer(lines.join("\n"));
}
}
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