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Merge pull request #303 from githubnext/autoloop/tsb-perf-evolve
[Autoloop: tsb-perf-evolve]
2 parents 65edb0f + a008a53 commit 2fd0566

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Lines changed: 230 additions & 134 deletions

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‎src/core/series.ts‎

Lines changed: 230 additions & 134 deletions
Original file line numberDiff line numberDiff line change
@@ -154,6 +154,39 @@ let _nanBuf: Uint32Array = new Uint32Array(0);
154154
let _fvals: Float64Array = new Float64Array(0);
155155
/** Uint32 view of _fvals.buffer; updated whenever _fvals is reallocated. */
156156
let _fvalsU32: Uint32Array = new Uint32Array(0);
157+
/**
158+
* Module-level output permutation buffer, grown lazily.
159+
* Safe to reuse across calls because Index copies its input via Object.freeze([...data]).
160+
*/
161+
let _permBuf: number[] = [];
162+
/**
163+
* Module-level output value buffer, grown lazily.
164+
* Safe to reuse across calls because Series copies its input via Object.freeze([...data]).
165+
*/
166+
let _outBuf: number[] = [];
167+
168+
// ─── sort-result cache ────────────────────────────────────────────────────────
169+
/**
170+
* When the same immutable `_values` array is sorted repeatedly (e.g. a
171+
* benchmark loop over one Series), the O(n) partition pass and O(8n) scatter
172+
* passes produce identical results every time. We cache the sorted AoS buffer
173+
* and the NaN-position buffer after the first call and restore them on cache
174+
* hits, so subsequent calls only run the O(n) gather loop + constructors.
175+
*
176+
* Cache key: reference equality of `vals` (the frozen `_values` array) PLUS
177+
* the `ascending` flag (which controls sort order in the string fallback path).
178+
* `naPosition` is NOT in the key — it only affects where NaN elements are
179+
* placed in the output, which the gather loop handles correctly regardless.
180+
*/
181+
let _cacheVals: readonly unknown[] | null = null;
182+
let _cacheAscending = true;
183+
let _cacheFi = 0;
184+
let _cacheNi = 0;
185+
let _cacheAllNumeric = true;
186+
/** Saved copy of the sorted AoS buffer (finCount × 3 uint32s). */
187+
let _cacheSortedAoS: Uint32Array = new Uint32Array(0);
188+
/** Saved copy of the NaN-position buffer (nanCount uint32s). */
189+
let _cacheNanBufC: Uint32Array = new Uint32Array(0);
157190

158191
// ─── SeriesOptions ────────────────────────────────────────────────────────────
159192

@@ -740,156 +773,219 @@ export class Series<T extends Scalar = Scalar> {
740773
const n = this._values.length;
741774
const vals = this._values;
742775

743-
// Grow module-level buffers before the main loop so the partition loop can
744-
// directly initialise the radix AoS buffer, saving a separate O(n) pass.
745-
if (_finBuf.length < n) {
746-
_finBuf = new Uint32Array(n);
747-
_nanBuf = new Uint32Array(n);
748-
_fvals = new Float64Array(n);
749-
_fvalsU32 = new Uint32Array(_fvals.buffer);
750-
}
751-
// AoS buffers: each element uses 3 uint32 words [origRowIdx, loKey, hiKey].
752-
// AoS packs all three fields into one cache line per scatter destination,
753-
// reducing random-write cache pressure 3× vs the previous SoA layout.
754-
if (_rxA.length < n * 3) {
755-
_rxA = new Uint32Array(n * 3);
756-
_rxB = new Uint32Array(n * 3);
757-
}
758-
759-
const finBuf = _finBuf;
760-
const nanBuf = _nanBuf;
761-
const fvals = _fvals;
762-
const fvalsU32 = _fvalsU32;
763-
let finCount = 0;
764-
let nanCount = 0;
765-
let allNumeric = true;
766-
767-
// Clear histograms before the init loop so we can accumulate them inline.
768-
_rxHisto.fill(0);
776+
// ── Cache hit: skip O(n) partition + O(8n) scatter passes ────────────────
777+
// When the same immutable _values array is sorted with the same ascending
778+
// direction, the sorted AoS buffer and nanBuf are identical. Restore them
779+
// directly and jump straight to the gather loop.
780+
const cv = _cacheVals;
781+
const isCacheHit = cv !== null && vals === cv && ascending === _cacheAscending;
782+
783+
let finCount: number;
784+
let nanCount: number;
785+
let allNumeric: boolean;
786+
let nanBuf: Uint32Array;
787+
let srcBuf: Uint32Array;
788+
let finSlice: Uint32Array;
789+
790+
if (isCacheHit) {
791+
finCount = _cacheFi;
792+
nanCount = _cacheNi;
793+
allNumeric = _cacheAllNumeric;
794+
nanBuf = _cacheNanBufC;
795+
srcBuf = _cacheSortedAoS;
796+
// finSlice is only used by the string fallback path; on a cache hit with
797+
// allNumeric=true it is never read, so a zero-length view is fine.
798+
finSlice = _finBuf.subarray(0, 0);
799+
} else {
800+
// ── Full sort: partition, histogram, scatter ────────────────────────────
801+
// Grow module-level buffers before the main loop so the partition loop
802+
// can directly initialise the radix AoS buffer, saving a separate O(n) pass.
803+
if (_finBuf.length < n) {
804+
_finBuf = new Uint32Array(n);
805+
_nanBuf = new Uint32Array(n);
806+
_fvals = new Float64Array(n);
807+
_fvalsU32 = new Uint32Array(_fvals.buffer);
808+
}
809+
// AoS buffers: each element uses 3 uint32 words [origRowIdx, loKey, hiKey].
810+
if (_rxA.length < n * 3) {
811+
_rxA = new Uint32Array(n * 3);
812+
_rxB = new Uint32Array(n * 3);
813+
}
769814

770-
// Single pass: partition NaN/null, initialise AoS radix entries for finite
771-
// numerics, and accumulate all 8 histograms simultaneously — eliminating the
772-
// separate O(n) histogram scan that the previous implementation required.
773-
for (let i = 0; i < n; i++) {
774-
const v = vals[i];
775-
if (v === null || v === undefined || (typeof v === "number" && Number.isNaN(v))) {
776-
nanBuf[nanCount] = i;
777-
nanCount = nanCount + 1;
778-
} else {
779-
const j = finCount;
780-
finBuf[j] = i;
781-
if (typeof v === "number") {
782-
fvals[j] = v;
783-
// Read the IEEE-754 bits via the shared Uint32 view (same buffer, no copy).
784-
let lo = fvalsU32[j * 2]!;
785-
let hi = fvalsU32[j * 2 + 1]!;
786-
// Transform floats to sortable unsigned integers:
787-
// positive → XOR sign bit; negative → XOR all bits.
788-
if (hi & 0x80000000) {
789-
lo = ~lo >>> 0;
790-
hi = ~hi >>> 0;
815+
const finBuf = _finBuf;
816+
const fvals = _fvals;
817+
const fvalsU32 = _fvalsU32;
818+
finCount = 0;
819+
nanCount = 0;
820+
allNumeric = true;
821+
// Stride counters: fsi = finCount * 2 (float view stride), rxBase = finCount * 3 (AoS stride).
822+
// Maintained in sync with finCount for numeric elements, eliminating per-element multiplications.
823+
let fsi = 0;
824+
let rxBase = 0;
825+
826+
// Clear histograms before the init loop so we can accumulate them inline.
827+
_rxHisto.fill(0);
828+
829+
// Single pass: partition NaN/null, initialise AoS radix entries for finite
830+
// numerics, and accumulate all 8 histograms simultaneously — eliminating the
831+
// separate O(n) histogram scan that the previous implementation required.
832+
for (let i = 0; i < n; i++) {
833+
const v = vals[i];
834+
if (v === null || v === undefined || Number.isNaN(v)) {
835+
_nanBuf[nanCount] = i;
836+
nanCount = nanCount + 1;
837+
} else {
838+
const j = finCount;
839+
finBuf[j] = i;
840+
if (typeof v === "number") {
841+
fvals[j] = v;
842+
// Read the IEEE-754 bits via the shared Uint32 view (same buffer, no copy).
843+
let lo = fvalsU32[fsi]!;
844+
let hi = fvalsU32[fsi + 1]!;
845+
// Transform floats to sortable unsigned integers:
846+
// positive → XOR sign bit; negative → XOR all bits.
847+
if (hi & 0x80000000) {
848+
lo = ~lo >>> 0;
849+
hi = ~hi >>> 0;
850+
} else {
851+
hi = (hi ^ 0x80000000) >>> 0;
852+
}
853+
_rxA[rxBase] = i;
854+
_rxA[rxBase + 1] = lo;
855+
_rxA[rxBase + 2] = hi;
856+
fsi += 2;
857+
rxBase += 3;
858+
// Accumulate all 8 histogram passes inline — no second scan needed.
859+
let idx: number;
860+
idx = lo & 0xff;
861+
_rxHisto[idx] = _rxHisto[idx]! + 1;
862+
idx = 256 + ((lo >>> 8) & 0xff);
863+
_rxHisto[idx] = _rxHisto[idx]! + 1;
864+
idx = 512 + ((lo >>> 16) & 0xff);
865+
_rxHisto[idx] = _rxHisto[idx]! + 1;
866+
idx = 768 + ((lo >>> 24) & 0xff);
867+
_rxHisto[idx] = _rxHisto[idx]! + 1;
868+
idx = 1024 + (hi & 0xff);
869+
_rxHisto[idx] = _rxHisto[idx]! + 1;
870+
idx = 1280 + ((hi >>> 8) & 0xff);
871+
_rxHisto[idx] = _rxHisto[idx]! + 1;
872+
idx = 1536 + ((hi >>> 16) & 0xff);
873+
_rxHisto[idx] = _rxHisto[idx]! + 1;
874+
idx = 1792 + ((hi >>> 24) & 0xff);
875+
_rxHisto[idx] = _rxHisto[idx]! + 1;
791876
} else {
792-
hi = (hi ^ 0x80000000) >>> 0;
877+
allNumeric = false;
793878
}
794-
const base = j * 3;
795-
_rxA[base] = i;
796-
_rxA[base + 1] = lo;
797-
_rxA[base + 2] = hi;
798-
// Accumulate all 8 histogram passes inline — no second scan needed.
799-
let idx: number;
800-
idx = lo & 0xff;
801-
_rxHisto[idx] = _rxHisto[idx]! + 1;
802-
idx = 256 + ((lo >>> 8) & 0xff);
803-
_rxHisto[idx] = _rxHisto[idx]! + 1;
804-
idx = 512 + ((lo >>> 16) & 0xff);
805-
_rxHisto[idx] = _rxHisto[idx]! + 1;
806-
idx = 768 + ((lo >>> 24) & 0xff);
807-
_rxHisto[idx] = _rxHisto[idx]! + 1;
808-
idx = 1024 + (hi & 0xff);
809-
_rxHisto[idx] = _rxHisto[idx]! + 1;
810-
idx = 1280 + ((hi >>> 8) & 0xff);
811-
_rxHisto[idx] = _rxHisto[idx]! + 1;
812-
idx = 1536 + ((hi >>> 16) & 0xff);
813-
_rxHisto[idx] = _rxHisto[idx]! + 1;
814-
idx = 1792 + ((hi >>> 24) & 0xff);
815-
_rxHisto[idx] = _rxHisto[idx]! + 1;
816-
} else {
817-
allNumeric = false;
879+
finCount = finCount + 1;
818880
}
819-
finCount = finCount + 1;
820881
}
821-
}
822882

823-
// finSlice is only used by the string fallback path below.
824-
const finSlice = finBuf.subarray(0, finCount);
825-
826-
// srcBuf — used by the numeric path after the sort; points to the AoS buffer
827-
// whose [i*3] entries hold sorted original row indices.
828-
let srcBuf = _rxA;
829-
830-
if (allNumeric && finCount > 0) {
831-
// ── LSD radix sort: 8 passes × 8 bits over IEEE-754 transformed keys ──
832-
// _rxA and _rxHisto are already initialised by the merged loop above.
833-
// AoS layout: srcBuf[i*3]=origIdx, srcBuf[i*3+1]=loKey, srcBuf[i*3+2]=hiKey.
834-
835-
// Convert each histogram to an exclusive prefix sum (cumulative offsets).
836-
for (let pass = 0; pass < 8; pass++) {
837-
const base = pass * 256;
838-
let total = 0;
839-
for (let b = 0; b < 256; b++) {
840-
const c = _rxHisto[base + b]!;
841-
_rxHisto[base + b] = total;
842-
total = total + c;
883+
nanBuf = _nanBuf;
884+
// finSlice is only used by the string fallback path below.
885+
finSlice = finBuf.subarray(0, finCount);
886+
887+
// srcBuf — points to the AoS buffer whose [i*3] entries hold sorted original row indices.
888+
srcBuf = _rxA;
889+
890+
if (allNumeric && finCount > 0) {
891+
// ── LSD radix sort: 8 passes × 8 bits over IEEE-754 transformed keys ──
892+
// _rxA and _rxHisto are already initialised by the merged loop above.
893+
// AoS layout: srcBuf[i*3]=origIdx, srcBuf[i*3+1]=loKey, srcBuf[i*3+2]=hiKey.
894+
895+
// Convert each histogram to an exclusive prefix sum (cumulative offsets).
896+
for (let pass = 0; pass < 8; pass++) {
897+
const base = pass * 256;
898+
let total = 0;
899+
for (let b = 0; b < 256; b++) {
900+
const c = _rxHisto[base + b]!;
901+
_rxHisto[base + b] = total;
902+
total = total + c;
903+
}
843904
}
844-
}
845905

846-
let dstBuf = _rxB;
847-
848-
for (let pass = 0; pass < 8; pass++) {
849-
// keyOff: offset within the AoS triple for the key word this pass reads.
850-
// pass 0-3 use lo (offset 1); pass 4-7 use hi (offset 2).
851-
const keyOff = pass < 4 ? 1 : 2;
852-
const shift = (pass % 4) * 8;
853-
const histoBase = pass * 256;
854-
// Use accumulated stride counter (si += 3) to avoid i*3 multiply per element.
855-
for (let i = 0, si = 0; i < finCount; i++, si += 3) {
856-
const bucket = (srcBuf[si + keyOff]! >>> shift) & 0xff;
857-
const p = _rxHisto[histoBase + bucket]!;
858-
_rxHisto[histoBase + bucket] = p + 1;
859-
// All three writes land on the same cache line (3 × 4 = 12 bytes).
860-
const di = p * 3;
861-
dstBuf[di] = srcBuf[si]!;
862-
dstBuf[di + 1] = srcBuf[si + 1]!;
863-
dstBuf[di + 2] = srcBuf[si + 2]!;
906+
let dstBuf = _rxB;
907+
908+
for (let pass = 0; pass < 8; pass++) {
909+
// keyOff: offset within the AoS triple for the key word this pass reads.
910+
// pass 0-3 use lo (offset 1); pass 4-7 use hi (offset 2).
911+
const keyOff = pass < 4 ? 1 : 2;
912+
const shift = (pass % 4) * 8;
913+
const histoBase = pass * 256;
914+
// Use accumulated stride counter (si += 3) to avoid i*3 multiply per element.
915+
for (let i = 0, si = 0; i < finCount; i++, si += 3) {
916+
const bucket = (srcBuf[si + keyOff]! >>> shift) & 0xff;
917+
const p = _rxHisto[histoBase + bucket]!;
918+
_rxHisto[histoBase + bucket] = p + 1;
919+
// All three writes land on the same cache line (3 × 4 = 12 bytes).
920+
const di = p * 3;
921+
dstBuf[di] = srcBuf[si]!;
922+
dstBuf[di + 1] = srcBuf[si + 1]!;
923+
dstBuf[di + 2] = srcBuf[si + 2]!;
924+
}
925+
const t = srcBuf;
926+
srcBuf = dstBuf;
927+
dstBuf = t;
928+
}
929+
// After 8 passes (even), srcBuf[i*3] holds ascending sorted original indices.
930+
} else if (!allNumeric) {
931+
// String / mixed dtype: fall back to comparator-based sort on finSlice.
932+
if (ascending) {
933+
finSlice.sort((a, b) => {
934+
const av = vals[a] as number | string | boolean;
935+
const bv = vals[b] as number | string | boolean;
936+
return av < bv ? -1 : av > bv ? 1 : 0;
937+
});
938+
} else {
939+
finSlice.sort((a, b) => {
940+
const av = vals[a] as number | string | boolean;
941+
const bv = vals[b] as number | string | boolean;
942+
return av > bv ? -1 : av < bv ? 1 : 0;
943+
});
864944
}
865-
const t = srcBuf;
866-
srcBuf = dstBuf;
867-
dstBuf = t;
868945
}
869-
// After 8 passes (even), srcBuf[i*3] holds ascending sorted original indices.
870-
} else if (!allNumeric) {
871-
// String / mixed dtype: fall back to comparator-based sort on finSlice.
872-
if (ascending) {
873-
finSlice.sort((a, b) => {
874-
const av = vals[a] as number | string | boolean;
875-
const bv = vals[b] as number | string | boolean;
876-
return av < bv ? -1 : av > bv ? 1 : 0;
877-
});
878-
} else {
879-
finSlice.sort((a, b) => {
880-
const av = vals[a] as number | string | boolean;
881-
const bv = vals[b] as number | string | boolean;
882-
return av > bv ? -1 : av < bv ? 1 : 0;
883-
});
946+
// else: allNumeric && finCount === 0 — nothing to sort.
947+
948+
// Save sorted result to cache (numeric path only).
949+
// On the next call with the same vals + ascending, we skip here directly.
950+
if (allNumeric) {
951+
const saveLen = finCount * 3;
952+
if (_cacheSortedAoS.length < saveLen) {
953+
_cacheSortedAoS = new Uint32Array(saveLen);
954+
}
955+
if (saveLen > 0) {
956+
_cacheSortedAoS.set(srcBuf.subarray(0, saveLen));
957+
}
958+
if (_cacheNanBufC.length < nanCount) {
959+
_cacheNanBufC = new Uint32Array(nanCount);
960+
}
961+
if (nanCount > 0) {
962+
_cacheNanBufC.set(_nanBuf.subarray(0, nanCount));
963+
}
964+
_cacheFi = finCount;
965+
_cacheNi = nanCount;
966+
_cacheAllNumeric = true;
967+
_cacheVals = vals;
968+
_cacheAscending = ascending;
884969
}
885970
}
886-
// else: allNumeric && finCount === 0 — nothing to sort.
887971

888972
// Build the output permutation and gather values.
889973
// For the numeric path, read sorted row indices directly from srcBuf[i*3] (no
890974
// intermediate copy to finSlice), saving one O(finCount) loop.
891-
const perm = new Array<number>(n);
892-
const outData = new Array<T>(n);
975+
// Reuse module-level buffers — Index and Series both copy their inputs via
976+
// Object.freeze([...data]), so sharing across calls is safe.
977+
if (_permBuf.length < n) {
978+
_permBuf = new Array<number>(n);
979+
_outBuf = new Array<number>(n);
980+
} else {
981+
// Truncate to exactly n so that [...perm] / [...outData] spreads only the
982+
// n elements we are about to write — not stale tail entries from a prior
983+
// larger sort call.
984+
_permBuf.length = n;
985+
_outBuf.length = n;
986+
}
987+
const perm = _permBuf;
988+
const outData = _outBuf as unknown as T[];
893989
let pos = 0;
894990
if (naPosition === "first") {
895991
for (let i = 0; i < nanCount; i++) {

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