Store ordinary relationship keys as exact type ID pairs by jakebailey · Pull Request #64788 · microsoft/TypeScript

Jake Bailey (jakebailey) · 2026-10-13T17:36:58Z

Ordinary comparisons only need two 32-bit type IDs, but each cached result stored a 128-bit hash.

Stores ordinary comparisons as exact 64-bit ID pairs; generic normalization keeps its full-width hash.
VS Code measurements showed 0.94% less retained heap and 1.29% fewer allocated bytes.

Copilot

🟢 Approval recommended

The focused cache representation change preserves existing semantics and has comprehensive unit coverage.

0 open findings

What changed in this PR

Optimizes relationship caching by storing ordinary comparisons as exact 64-bit type-ID pairs while preserving generic hashes.

Changes:

Splits ordinary and generic relation caches.
Packs ordinary type IDs into collision-free keys.
Adds coverage for key states, namespaces, and generic normalization.

File	Description
`tsc/internal/checker/checker.go`	Generates packed ordinary keys and hashed generic keys.
`tsc/internal/checker/relater.go`	Implements separate relation caches.
`tsc/internal/checker/types_test.go`	Tests relation-key behavior.

🧠 Review effort: Balanced

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Copilot

🟢 Approval recommended

The cache representation remains behaviorally equivalent and is well covered by focused tests.

0 open findings

🧠 Review effort: Balanced

Ordinary type comparisons need only two 32-bit IDs and intersection context, but retained a 128-bit hash for every cached result. Hashing and storing twice the necessary key width wastes allocations and memory. Keep exact 64-bit pairs in separate maps for the four intersection states. Generic-reference normalization still uses its original full-width hash. An explicit key tag separates both namespaces, including recursion guards, without sacrificing hash bits or changing constrained generic behavior. Six fresh-process interleaved VS Code comparisons against the parent commit, using normal GC, reduce retained heap 0.94% (roughly 33 MiB) and total allocated bytes 1.29%. GC scanning, allocation events, and instruction counts are not statistically different. Tests cover directional and identity comparisons, all intersection contexts, result replacement, exact high-bit IDs, namespace isolation, generic parameter normalization, and constrained versus unconstrained recursion keys. Production diagnostics and all semantic counts match exactly. goos: linux goarch: amd64 pkg: github.com/microsoft/TypeScript/tsc/internal/checker cpu: Intel(R) Core(TM) i9-10900K CPU @ 3.70GHz │ vscode-relation-before-6.txt │ vscode-relation-6.txt │ │ retained-B │ retained-B vs base │ ExternalProgram-20 3.456Gi ± 0% 3.424Gi ± 0% -0.94% (p=0.002 n=6) │ vscode-relation-before-6.txt │ vscode-relation-6.txt │ │ scan-B │ scan-B vs base │ ExternalProgram-20 2.998Gi ± 0% 2.997Gi ± 0% ~ (p=0.310 n=6) │ vscode-relation-before-6.txt │ vscode-relation-6.txt │ │ B/op │ B/op vs base │ ExternalProgram-20 5.021Gi ± 0% 4.956Gi ± 0% -1.29% (p=0.002 n=6) │ vscode-relation-before-6.txt │ vscode-relation-6.txt │ │ allocs/op │ allocs/op vs base │ ExternalProgram-20 31.08M ± 0% 31.07M ± 0% ~ (p=0.240 n=6) │ relation-before-instructions.txt │ relation-instructions.txt │ │ instructions/op │ instructions/op vs base │ ExternalInstructions-20 269.3G ± 2% 270.0G ± 3% ~ (p=0.937 n=6)

Jake Bailey (jakebailey) · 2026-10-14T17:13:34Z

TypeScript Bot (@typescript-bot) perf test this faster

typescript-automation · 2026-10-14T17:13:44Z

Starting jobs; this comment will be updated as builds start and complete.

Command	Status	Results
`perf test this faster`	✅ Started	👀 Results

typescript-automation · 2026-10-14T17:47:12Z

Jake Bailey (@jakebailey)
The results of the perf run you requested are in!

Here they are:

tsc

Comparison Report - baseline..pr

_Metric	_baseline	_pr	_Delta	_Best	_Worst	_p-value
_{Compiler-Unions - native}
_Errors	₄₁	₄₁	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_115,276	_115,276	_~	_~	_~	_{p=1.000 n=12}
_Types	_79,613	_79,613	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{113,545k (± 0.07%)}	_{109,969k (± 0.07%)}	_{🟩-3,576k (- 3.15%)}	_109,808k	_110,176k	_{p=0.000 n=12}
_{Memory Allocs}	_{2,212,432 (± 0.00%)}	_{2,212,662 (± 0.00%)}	_{+230 (+ 0.01%)}	_2,212,441	_2,212,934	_{p=0.002 n=12}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Parse Time}	_{0.049s (± 3.59%)}	_{0.048s (± 2.51%)}	_~	_0.046s	_0.052s	_{p=0.452 n=12}
_{Bind Time}	_{0.018s (± 9.02%)}	_{0.018s (± 9.28%)}	_~	_0.014s	_0.022s	_{p=1.000 n=12}
_{Check Time}	_{0.580s (± 0.61%)}	_{0.575s (± 0.39%)}	_{-0.006s (- 0.99%)}	_0.568s	_0.580s	_{p=0.013 n=12}
_{Emit Time}	_{0.327s (± 1.81%)}	_{0.329s (± 2.11%)}	_~	_0.312s	_0.348s	_{p=0.701 n=12}
_{Total Time}	_{0.982s (± 0.70%)}	_{0.978s (± 0.81%)}	_~	_0.962s	_1.004s	_{p=0.312 n=12}
_{angular-1 - native}
_Errors	₃	₃	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_{847,226 (± 0.07%)}	_{846,950 (± 0.08%)}	_~	_844,926	_848,574	_{p=0.724 n=12}
_Types	_{247,031 (± 0.00%)}	_{247,032 (± 0.00%)}	_~	_247,030	_247,033	_{p=0.509 n=12}
_{Memory Used}	_{596,432k (± 0.02%)}	_{595,377k (± 0.03%)}	_{-1,055k (- 0.18%)}	_595,026k	_595,749k	_{p=0.000 n=12}
_{Memory Allocs}	_{13,139,398 (± 0.03%)}	_{13,137,888 (± 0.02%)}	_~	_13,134,614	_13,149,070	_{p=0.443 n=12}
_{Config Time}	_{0.021s (± 5.35%)}	_{0.021s (± 5.80%)}	_~	_0.020s	_0.025s	_{p=0.328 n=12}
_{Parse Time}	_{0.280s (± 2.70%)}	_{0.299s (± 4.16%)}	_{🔻+0.019s (+ 6.76%)}	_0.272s	_0.331s	_{p=0.010 n=12}
_{Bind Time}	_{0.112s (±11.33%)}	_{0.110s (±14.11%)}	_~	_0.079s	_0.140s	_{p=0.919 n=12}
_{Check Time}	_0s	_0s	_~	_~	_~	_{p=1.000 n=12}
_{Emit Time}	_{1.870s (± 1.54%)}	_{1.950s (± 2.58%)}	_{🔻+0.080s (+ 4.30%)}	_1.809s	_2.113s	_{p=0.006 n=12}
_{Total Time}	_{2.304s (± 1.60%)}	_{2.400s (± 2.45%)}	_{🔻+0.095s (+ 4.14%)}	_2.230s	_2.564s	_{p=0.006 n=12}
_{mui-docs - native}
_Errors	_11,405	_11,405	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_4,331,835	_4,331,835	_~	_~	_~	_{p=1.000 n=12}
_Types	_1,370,520	_1,370,520	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{2,627,092k (± 0.05%)}	_{2,613,311k (± 0.07%)}	_{-13,781k (- 0.52%)}	_2,609,490k	_2,618,886k	_{p=0.000 n=12}
_{Memory Allocs}	_{27,719,041 (± 0.04%)}	_{27,701,574 (± 0.08%)}	_~	_27,642,825	_27,783,172	_{p=0.052 n=12}
_{Config Time}	_{0.020s (± 1.21%)}	_{0.020s (± 1.21%)}	_~	_0.020s	_0.021s	_{p=1.000 n=12}
_{Parse Time}	_{0.581s (± 2.64%)}	_{0.582s (± 2.85%)}	_~	_0.538s	_0.635s	_{p=0.876 n=12}
_{Bind Time}	_{0.003s (±10.34%)}	_{0.003s (±12.54%)}	_~	_0.002s	_0.003s	_{p=0.667 n=12}
_{Check Time}	_{8.784s (± 0.20%)}	_{8.797s (± 0.46%)}	_~	_8.683s	_8.907s	_{p=0.561 n=12}
_{Emit Time}	_{0.733s (± 9.03%)}	_{0.671s (±12.07%)}	_~	_0.506s	_0.797s	_{p=0.104 n=12}
_{Total Time}	_{11.040s (± 0.74%)}	_{11.001s (± 0.92%)}	_~	_10.738s	_11.296s	_{p=0.235 n=12}
_{strada-build-src - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_1,388,669	_1,388,669	_~	_~	_~	_{p=1.000 n=12}
_Types	_441,862	_441,862	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{1,306,717k (± 0.32%)}	_{1,310,410k (± 0.53%)}	_~	_1,289,634k	_1,330,242k	_{p=0.319 n=12}
_{Memory Allocs}	_{78,222,085 (± 0.13%)}	_{78,177,455 (± 0.12%)}	_~	_77,885,090	_78,354,044	_{p=0.198 n=12}
_{Config Time}	_{0.004s (± 8.27%)}	_{0.004s (± 9.39%)}	_~	_0.003s	_0.004s	_{p=0.131 n=12}
_{Parse Time}	_{0.258s (± 2.54%)}	_{0.250s (± 2.63%)}	_~	_0.238s	_0.270s	_{p=0.066 n=12}
_{Bind Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Check Time}	_{1.757s (± 0.49%)}	_{1.771s (± 0.57%)}	_{+0.015s (+ 0.83%)}	_1.747s	_1.799s	_{p=0.045 n=12}
_{Emit Time}	_{0.299s (± 4.45%)}	_{0.298s (± 3.79%)}	_~	_0.261s	_0.320s	_{p=0.944 n=12}
_{Total Time}	_{20.641s (± 0.48%)}	_{20.709s (± 0.42%)}	_~	_20.447s	_20.899s	_{p=0.410 n=12}
_{strada-compiler - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_334,953	_334,953	_~	_~	_~	_{p=1.000 n=12}
_Types	_197,616	_197,616	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{247,539k (± 0.03%)}	_{245,597k (± 0.02%)}	_{-1,942k (- 0.78%)}	_245,476k	_245,724k	_{p=0.000 n=12}
_{Memory Allocs}	_{4,329,761 (± 0.01%)}	_{4,330,187 (± 0.01%)}	_~	_4,328,435	_4,331,284	_{p=0.132 n=12}
_{Config Time}	_0.001s	_0.001s	_~	_~	_~	_{p=1.000 n=12}
_{Parse Time}	_{0.109s (± 5.49%)}	_{0.113s (± 3.93%)}	_~	_0.101s	_0.125s	_{p=0.213 n=12}
_{Bind Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Check Time}	_{0.999s (± 0.63%)}	_{1.005s (± 0.53%)}	_~	_0.993s	_1.020s	_{p=0.097 n=12}
_{Emit Time}	_{0.155s (± 3.81%)}	_{0.152s (± 4.58%)}	_~	_0.134s	_0.172s	_{p=0.560 n=12}
_{Total Time}	_{1.319s (± 0.82%)}	_{1.324s (± 0.76%)}	_~	_1.297s	_1.354s	_{p=0.599 n=12}
_{ts-pre-modules - native}
_Errors	₈₇	₈₇	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_303,834	_303,834	_~	_~	_~	_{p=1.000 n=12}
_Types	_181,663	_181,663	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{215,216k (± 0.02%)}	_{214,134k (± 0.03%)}	_{-1,082k (- 0.50%)}	_213,948k	_214,313k	_{p=0.000 n=12}
_{Memory Allocs}	_{1,401,471 (± 0.01%)}	_{1,402,038 (± 0.04%)}	_{+567 (+ 0.04%)}	_1,401,424	_1,405,006	_{p=0.003 n=12}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Parse Time}	_{0.095s (± 3.93%)}	_{0.095s (± 3.26%)}	_~	_0.087s	_0.102s	_{p=0.921 n=12}
_{Bind Time}	_{0.041s (± 9.24%)}	_{0.037s (± 8.30%)}	_~	_0.030s	_0.047s	_{p=0.116 n=12}
_{Check Time}	_{0.783s (± 0.58%)}	_{0.797s (± 0.96%)}	_{+0.014s (+ 1.82%)}	_0.780s	_0.815s	_{p=0.007 n=12}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Total Time}	_{0.935s (± 0.63%)}	_{0.945s (± 0.52%)}	_{+0.010s (+ 1.09%)}	_0.933s	_0.958s	_{p=0.015 n=12}
_{vscode - native}
_Errors	₃₉₆	₃₉₆	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_11,687,315	_11,687,315	_~	_~	_~	_{p=1.000 n=12}
_Types	_3,851,234	_3,851,234	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{5,515,025k (± 0.03%)}	_{5,486,559k (± 0.01%)}	_{-28,466k (- 0.52%)}	_5,485,301k	_5,489,348k	_{p=0.000 n=12}
_{Memory Allocs}	_{56,199,448 (± 0.03%)}	_{56,194,715 (± 0.02%)}	_~	_56,183,903	_56,244,181	_{p=1.000 n=12}
_{Config Time}	_{0.075s (± 0.33%)}	_{0.075s (± 0.38%)}	_~	_0.074s	_0.075s	_{p=1.000 n=12}
_{Parse Time}	_{1.751s (± 2.31%)}	_{1.733s (± 2.25%)}	_~	_1.663s	_1.887s	_{p=0.590 n=12}
_{Bind Time}	_{0.634s (±12.35%)}	_{0.670s (±12.33%)}	_~	_0.467s	_0.843s	_{p=0.590 n=12}
_{Check Time}	_{13.395s (± 0.96%)}	_{13.292s (± 0.96%)}	_{-0.104s (- 0.77%)}	_13.111s	_13.666s	_{p=0.039 n=12}
_{Emit Time}	_{5.502s (± 6.95%)}	_{5.524s (± 7.20%)}	_~	_4.329s	_6.205s	_{p=0.843 n=12}
_{Total Time}	_{21.448s (± 1.40%)}	_{21.388s (± 1.43%)}	_~	_20.503s	_21.921s	_{p=0.671 n=12}
_{webpack - native}
_Errors	₅₈₄	₅₈₄	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_1,299,351	_1,299,351	_~	_~	_~	_{p=1.000 n=12}
_Types	_598,360	_598,360	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{789,463k (± 0.02%)}	_{784,952k (± 0.02%)}	_{-4,511k (- 0.57%)}	_784,639k	_785,384k	_{p=0.000 n=12}
_{Memory Allocs}	_{6,052,667 (± 0.02%)}	_{6,053,819 (± 0.03%)}	_~	_6,050,780	_6,059,881	_{p=0.378 n=12}
_{Config Time}	_{0.008s (± 4.38%)}	_{0.007s (± 4.22%)}	_~	_0.007s	_0.008s	_{p=0.680 n=12}
_{Parse Time}	_{0.234s (± 2.93%)}	_{0.238s (± 3.13%)}	_~	_0.218s	_0.257s	_{p=0.369 n=12}
_{Bind Time}	_{0.058s (± 8.39%)}	_{0.059s (± 5.50%)}	_~	_0.054s	_0.072s	_{p=0.307 n=12}
_{Check Time}	_{1.636s (± 0.68%)}	_{1.640s (± 0.31%)}	_~	_1.628s	_1.652s	_{p=1.000 n=12}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Total Time}	_{1.965s (± 0.59%)}	_{1.973s (± 0.53%)}	_~	_1.950s	_2.002s	_{p=0.325 n=12}
_{xstate-main - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_1,062,854	_1,062,854	_~	_~	_~	_{p=1.000 n=12}
_Types	_390,845	_390,845	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{472,365k (± 0.03%)}	_{470,658k (± 0.03%)}	_{-1,706k (- 0.36%)}	_470,291k	_471,007k	_{p=0.000 n=12}
_{Memory Allocs}	_{4,224,654 (± 0.06%)}	_{4,224,527 (± 0.09%)}	_~	_4,215,223	_4,236,159	_{p=0.887 n=12}
_{Config Time}	_{0.003s (±10.34%)}	_{0.003s (± 6.23%)}	_~	_0.002s	_0.003s	_{p=0.590 n=12}
_{Parse Time}	_{0.138s (± 2.97%)}	_{0.140s (± 2.69%)}	_~	_0.130s	_0.147s	_{p=0.557 n=12}
_{Bind Time}	_{0.043s (±14.09%)}	_{0.040s (±11.46%)}	_~	_0.033s	_0.050s	_{p=0.501 n=12}
_{Check Time}	_{1.009s (± 0.95%)}	_{1.009s (± 1.16%)}	_~	_0.985s	_1.042s	_{p=0.899 n=12}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Total Time}	_{1.202s (± 0.96%)}	_{1.200s (± 1.14%)}	_~	_1.169s	_1.233s	_{p=0.766 n=12}

System info unknown

Hosts

native

Scenarios

Compiler-Unions - native
angular-1 - native
mui-docs - native
strada-build-src - native
strada-compiler - native
ts-pre-modules - native
vscode - native
webpack - native
xstate-main - native

_Benchmark	_Name	_Iterations
_Current	_pr	₁₂
_Baseline	_baseline	₁₂

Developer Information:

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typescript-automation Bot assigned Jake Bailey (jakebailey) Oct 13, 2026

typescript-automation Bot added Author: Team For Uncommitted Bug PR for untriaged, rejected, closed or missing bug labels Oct 13, 2026

Jake Bailey (jakebailey) added this pull request to stack #64792 October 13, 2026 17:37

Jake Bailey (jakebailey) mentioned this pull request Oct 13, 2026

Various memory optimizations #64734

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Jake Bailey (jakebailey) marked this pull request as ready for review October 13, 2026 17:42

Copilot AI balanced review requested due to automatic review settings October 13, 2026 17:42

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Jake Bailey (jakebailey) force-pushed the jakebailey/mem/indexed-type-node-caches branch from 6360afc to e7a1293 Compare October 13, 2026 18:36

Jake Bailey (jakebailey) force-pushed the jakebailey/mem/exact-relation-keys branch from 98420cf to 46ffb18 Compare October 13, 2026 18:36

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Jake Bailey (jakebailey) force-pushed the jakebailey/mem/indexed-type-node-caches branch from e7a1293 to e46e706 Compare October 13, 2026 20:06

Jake Bailey (jakebailey) force-pushed the jakebailey/mem/exact-relation-keys branch from 46ffb18 to 3b5631d Compare October 13, 2026 20:06

Base automatically changed from jakebailey/mem/indexed-type-node-caches to jakebailey/mem/compact-member-indexes October 13, 2026 20:06

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Jake Bailey (jakebailey) force-pushed the jakebailey/mem/exact-relation-keys branch from ad1de82 to 354885c Compare October 14, 2026 03:47

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Jake Bailey (jakebailey) force-pushed the jakebailey/mem/exact-relation-keys branch from 0e30e19 to 8455c76 Compare October 14, 2026 14:17

Jake Bailey (jakebailey) force-pushed the jakebailey/mem/compact-member-indexes branch from 7265ad1 to 04c2a42 Compare October 14, 2026 14:17

Jake Bailey (jakebailey) force-pushed the jakebailey/mem/exact-relation-keys branch from 8455c76 to 953c7fb Compare October 14, 2026 16:02

Jake Bailey (jakebailey) removed this pull request from stack #64806 October 14, 2026 16:55

Jake Bailey (jakebailey) changed the base branch from jakebailey/mem/compact-member-indexes to main October 14, 2026 16:56

Jake Bailey (jakebailey) force-pushed the jakebailey/mem/exact-relation-keys branch from 953c7fb to 8f3ee02 Compare October 14, 2026 16:56

Jake Bailey (jakebailey) marked this pull request as ready for review October 14, 2026 16:58

Jake Bailey (jakebailey) requested a review from Anders Hejlsberg (ahejlsberg) October 14, 2026 17:21

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Store ordinary relationship keys as exact type ID pairs - #64788

Store ordinary relationship keys as exact type ID pairs#64788
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jakebailey/mem/exact-relation-keys

Jake Bailey (jakebailey) commented Oct 13, 2026 •

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Jake Bailey (jakebailey) commented Oct 13, 2026 •

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