Only pre-size the printer buffer when printing a whole file by jakebailey · Pull Request #64972 · microsoft/TypeScript

Jake Bailey (jakebailey) · 2026-10-26T19:18:54Z

This has been wasting a whole bunch of memory on printing.

Write grew the writer by the full source file length for every call, including when printing a single type node for typeToString or the type baselines. Each resulting string then pinned a buffer the size of the file; for largeControlFlowGraph.ts the types baseline retained over 3GB this way, which exhausts the 4GB wasm address space.

Jake Bailey (jakebailey) · 2026-10-26T19:19:16Z

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

typescript-automation · 2026-10-26T19:19:22Z

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

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

Copilot

🟢 Approval recommended

The narrow guard preserves whole-file preallocation without changing printed output, and no blocking issues were identified.

No open issues 🎉

What changed in this PR

This PR reduces unnecessary memory allocation in the compiler’s printer by limiting buffer pre-sizing to whole-file printing.

Changes:

Pre-size the buffer only when the node being printed is the supplied source file.
Avoid reserving whole-file capacity when printing individual nodes.

File	Description
`tsc/internal/printer/printer.go`	Restricts source-length buffer preallocation to whole-file printing.

_{Review effort: Balanced}

typescript-automation · 2026-10-26T22:50:47Z

Jake Bailey (@jakebailey), the perf run you requested failed. You can check the log here.

typescript-automation · 2026-10-27T00:49:05Z

Jake Bailey (@jakebailey), the perf run you requested failed. You can check the log here.

typescript-automation · 2026-10-27T10:25:10Z

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

Here they are:

Provisional hosted-runner results: these VMs are not the dedicated benchmark machines. Results may be noisier and are not comparable to the historical series. For comparisons, both revisions of each scenario ran on the same VM.

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	_88,466	_88,466	_~	_~	_~	_{p=1.000 n=12}
_Types	_79,607	_79,607	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{109,256k (± 0.09%)}	_{107,805k (± 0.05%)}	_{-1,451k (- 1.33%)}	_107,699k	_107,924k	_{p=0.000 n=12}
_{Memory Allocs}	_{2,196,992 (± 0.01%)}	_{2,196,848 (± 0.00%)}	_~	_2,196,678	_2,197,231	_{p=0.089 n=12}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Parse Time}	_{0.032s (± 3.85%)}	_{0.032s (± 4.55%)}	_~	_0.029s	_0.036s	_{p=0.671 n=12}
_{Bind Time}	_{0.012s (± 6.46%)}	_{0.012s (± 4.20%)}	_~	_0.010s	_0.013s	_{p=0.446 n=12}
_{Check Time}	_{0.339s (± 0.52%)}	_{0.335s (± 0.39%)}	_{-0.004s (- 1.33%)}	_0.332s	_0.339s	_{p=0.000 n=12}
_{Emit Time}	_{0.214s (± 1.75%)}	_{0.210s (± 0.77%)}	_{-0.004s (- 1.79%)}	_0.206s	_0.216s	_{p=0.009 n=12}
_{Total Time}	_{0.602s (± 0.68%)}	_{0.593s (± 0.45%)}	_{-0.009s (- 1.51%)}	_0.588s	_0.601s	_{p=0.002 n=12}
_{angular-1 - native}
_Errors	₃	₃	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_{586,520 (± 0.02%)}	_{586,527 (± 0.02%)}	_~	_586,209	_586,747	_{p=0.989 n=12}
_Types	_{241,691 (± 0.00%)}	_{241,693 (± 0.00%)}	_{+2 (+ 0.00%)}	_241,691	_241,695	_{p=0.002 n=12}
_{Memory Used}	_{551,238k (± 0.02%)}	_{551,185k (± 0.02%)}	_~	_550,981k	_551,440k	_{p=0.469 n=12}
_{Memory Allocs}	_{13,073,823 (± 0.07%)}	_{13,074,687 (± 0.07%)}	_~	_13,067,360	_13,121,527	_{p=0.378 n=12}
_{Config Time}	_{0.017s (± 1.07%)}	_0.017s	_~	_~	_~	_{p=1.000 n=12}
_{Parse Time}	_{0.192s (± 2.26%)}	_{0.193s (± 4.47%)}	_~	_0.177s	_0.223s	_{p=0.921 n=12}
_{Bind Time}	_{0.055s (± 8.75%)}	_{0.059s (±14.31%)}	_~	_0.051s	_0.082s	_{p=0.887 n=12}
_{Check Time}	_0s	_0s	_~	_~	_~	_{p=1.000 n=12}
_{Emit Time}	_{1.179s (± 1.19%)}	_{1.173s (± 1.40%)}	_~	_1.131s	_1.206s	_{p=0.854 n=12}
_{Total Time}	_{1.456s (± 0.92%)}	_{1.455s (± 0.96%)}	_~	_1.422s	_1.483s	_{p=0.920 n=12}
_{arktype - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_685,943	_685,943	_~	_~	_~	_{p=1.000 n=12}
_Types	_939,490	_939,490	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{533,209k (± 0.01%)}	_{532,539k (± 0.01%)}	_{-670k (- 0.13%)}	_532,339k	_532,779k	_{p=0.000 n=12}
_{Memory Allocs}	_{12,770,711 (± 0.01%)}	_{12,769,757 (± 0.01%)}	_~	_12,768,071	_12,772,220	_{p=0.291 n=12}
_{Config Time}	_0.002s	_0.002s	_~	_~	_~	_{p=1.000 n=12}
_{Parse Time}	_{0.060s (± 3.67%)}	_{0.062s (± 4.06%)}	_~	_0.055s	_0.068s	_{p=0.190 n=12}
_{Bind Time}	_{0.019s (±11.42%)}	_{0.020s (± 9.38%)}	_~	_0.017s	_0.025s	_{p=0.379 n=12}
_{Check Time}	_{1.398s (± 0.42%)}	_{1.409s (± 0.57%)}	_{+0.011s (+ 0.80%)}	_1.387s	_1.430s	_{p=0.046 n=12}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Total Time}	_{1.520s (± 0.55%)}	_{1.533s (± 0.59%)}	_{+0.013s (+ 0.85%)}	_1.507s	_1.554s	_{p=0.040 n=12}
_{mui-docs - native}
_Errors	_11,405	_11,405	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_3,784,027	_3,784,027	_~	_~	_~	_{p=1.000 n=12}
_Types	_1,355,982	_1,355,982	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{2,198,373k (± 0.07%)}	_{2,199,375k (± 0.06%)}	_~	_2,196,346k	_2,202,722k	_{p=0.370 n=12}
_{Memory Allocs}	_{26,476,877 (± 0.11%)}	_{26,493,525 (± 0.06%)}	_~	_26,437,562	_26,532,993	_{p=0.114 n=12}
_{Config Time}	_{0.014s (± 1.73%)}	_0.014s	_~	_~	_~	_{p=0.478 n=12}
_{Parse Time}	_{0.491s (± 2.12%)}	_{0.482s (± 2.44%)}	_~	_0.449s	_0.514s	_{p=0.271 n=12}
_{Bind Time}	_{0.002s (±21.90%)}	_{0.002s (±21.90%)}	_~	_0.001s	_0.002s	_{p=1.000 n=12}
_{Check Time}	_{4.794s (± 0.58%)}	_{4.806s (± 0.69%)}	_~	_4.700s	_4.899s	_{p=0.811 n=12}
_{Emit Time}	_{0.387s (± 8.90%)}	_{0.387s (± 8.75%)}	_~	_0.335s	_0.493s	_{p=0.659 n=12}
_{Total Time}	_{6.478s (± 0.72%)}	_{6.480s (± 0.65%)}	_~	_6.341s	_6.588s	_{p=0.523 n=12}
_{sentry - native}
_Errors	₂	₂	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_4,793,249	_4,793,249	_~	_~	_~	_{p=1.000 n=12}
_Types	_2,607,051	_2,607,051	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{3,204,946k (± 0.03%)}	_{3,204,399k (± 0.03%)}	_~	_3,201,348k	_3,208,213k	_{p=0.347 n=12}
_{Memory Allocs}	_{75,233,299 (± 0.12%)}	_{75,231,278 (± 0.14%)}	_~	_74,931,252	_75,444,093	_{p=0.843 n=12}
_{Config Time}	_{0.045s (± 0.94%)}	_{0.045s (± 0.87%)}	_~	_0.044s	_0.046s	_{p=0.603 n=12}
_{Parse Time}	_{0.730s (± 5.17%)}	_{0.739s (± 6.19%)}	_~	_0.664s	_0.904s	_{p=0.920 n=12}
_{Bind Time}	_{0.203s (±12.95%)}	_{0.197s (± 8.68%)}	_~	_0.174s	_0.253s	_{p=0.989 n=12}
_{Check Time}	_{9.588s (± 0.67%)}	_{9.416s (± 0.69%)}	_{-0.172s (- 1.80%)}	_9.276s	_9.642s	_{p=0.000 n=12}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Total Time}	_{10.627s (± 0.74%)}	_{10.460s (± 0.66%)}	_{-0.167s (- 1.57%)}	_10.349s	_10.751s	_{p=0.001 n=12}
_{social-app - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_1,883,075	_1,883,075	_~	_~	_~	_{p=1.000 n=12}
_Types	_1,158,171	_1,158,171	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{1,057,017k (± 0.02%)}	_{1,056,492k (± 0.02%)}	_{-525k (- 0.05%)}	_1,055,954k	_1,057,126k	_{p=0.000 n=12}
_{Memory Allocs}	_{13,583,355 (± 0.19%)}	_{13,586,716 (± 0.33%)}	_~	_13,532,636	_13,775,572	_{p=0.671 n=12}
_{Config Time}	_{0.014s (± 2.00%)}	_{0.015s (± 2.22%)}	_~	_0.014s	_0.015s	_{p=0.214 n=12}
_{Parse Time}	_{0.239s (± 2.69%)}	_{0.236s (± 1.82%)}	_~	_0.221s	_0.246s	_{p=0.433 n=12}
_{Bind Time}	_{0.056s (±14.66%)}	_{0.059s (±13.74%)}	_~	_0.047s	_0.085s	_{p=0.212 n=12}
_{Check Time}	_{2.172s (± 0.43%)}	_{2.131s (± 0.49%)}	_{-0.042s (- 1.93%)}	_2.106s	_2.161s	_{p=0.000 n=12}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Total Time}	_{2.503s (± 0.78%)}	_{2.459s (± 0.46%)}	_{-0.043s (- 1.73%)}	_2.426s	_2.482s	_{p=0.000 n=12}
_{strada-build-src - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_1,184,976	_1,184,976	_~	_~	_~	_{p=1.000 n=12}
_Types	_438,967	_438,967	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{1,254,441k (± 0.40%)}	_{1,264,052k (± 0.25%)}	_{+9,611k (+ 0.77%)}	_1,254,433k	_1,271,359k	_{p=0.003 n=12}
_{Memory Allocs}	_{76,856,941 (± 0.15%)}	_{77,006,138 (± 0.13%)}	_{+149,197 (+ 0.19%)}	_76,850,665	_77,301,200	_{p=0.045 n=12}
_{Config Time}	_{0.004s (± 9.45%)}	_{0.004s (±10.43%)}	_~	_0.003s	_0.005s	_{p=0.057 n=12}
_{Parse Time}	_{0.177s (± 3.33%)}	_{0.180s (± 2.47%)}	_~	_0.167s	_0.189s	_{p=0.434 n=12}
_{Bind Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Check Time}	_{1.196s (± 0.43%)}	_{1.188s (± 0.54%)}	_~	_1.170s	_1.201s	_{p=0.057 n=12}
_{Emit Time}	_{0.213s (± 3.01%)}	_{0.218s (± 2.29%)}	_~	_0.205s	_0.234s	_{p=0.183 n=12}
_{Total Time}	_{14.066s (± 0.75%)}	_{14.000s (± 0.49%)}	_~	_13.889s	_14.223s	_{p=0.164 n=12}
_{strada-compiler - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_263,513	_263,513	_~	_~	_~	_{p=1.000 n=12}
_Types	_196,118	_196,118	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{236,086k (± 0.03%)}	_{236,090k (± 0.03%)}	_~	_235,956k	_236,293k	_{p=0.755 n=12}
_{Memory Allocs}	_{4,287,566 (± 0.01%)}	_{4,287,705 (± 0.01%)}	_~	_4,286,601	_4,288,855	_{p=0.843 n=12}
_{Config Time}	_{0.001s (±19.81%)}	_0.001s	_~	_~	_~	_{p=1.000 n=12}
_{Parse Time}	_{0.073s (± 4.60%)}	_{0.073s (± 5.78%)}	_~	_0.064s	_0.083s	_{p=0.700 n=12}
_{Bind Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Check Time}	_{0.596s (± 0.43%)}	_{0.596s (± 0.80%)}	_~	_0.588s	_0.615s	_{p=0.337 n=12}
_{Emit Time}	_{0.100s (± 4.59%)}	_{0.094s (± 2.61%)}	_{🟩-0.006s (- 6.18%)}	_0.088s	_0.101s	_{p=0.027 n=12}
_{Total Time}	_{0.809s (± 0.98%)}	_{0.802s (± 0.69%)}	_~	_0.781s	_0.812s	_{p=0.124 n=12}
_{t3code-server - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_4,350,705	_4,350,705	_~	_~	_~	_{p=1.000 n=12}
_Types	_3,040,691	_3,040,691	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{2,610,376k (± 0.03%)}	_{2,609,991k (± 0.02%)}	_~	_2,608,994k	_2,611,346k	_{p=0.551 n=12}
_{Memory Allocs}	_{37,317,817 (± 0.06%)}	_{37,319,495 (± 0.07%)}	_~	_37,271,445	_37,388,426	_{p=0.977 n=12}
_{Config Time}	_{0.005s (± 5.98%)}	_0.005s	_{🟩-0.000s (- 7.69%)}	_~	_~	_{p=0.037 n=12}
_{Parse Time}	_{0.379s (± 3.36%)}	_{0.383s (± 5.49%)}	_~	_0.337s	_0.441s	_{p=0.766 n=12}
_{Bind Time}	_{0.133s (±10.25%)}	_{0.147s (±10.15%)}	_~	_0.111s	_0.182s	_{p=0.271 n=12}
_{Check Time}	_{11.382s (± 1.47%)}	_{11.230s (± 2.55%)}	_~	_10.810s	_12.243s	_{p=0.101 n=12}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Total Time}	_{11.915s (± 1.51%)}	_{11.784s (± 2.60%)}	_~	_11.328s	_12.842s	_{p=0.114 n=12}
_{ts-pre-modules - native}
_Errors	₈₇	₈₇	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_231,617	_231,617	_~	_~	_~	_{p=1.000 n=12}
_Types	_181,196	_181,196	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{203,523k (± 0.02%)}	_{203,346k (± 0.02%)}	_{-177k (- 0.09%)}	_203,254k	_203,411k	_{p=0.000 n=12}
_{Memory Allocs}	_{1,357,967 (± 0.01%)}	_{1,358,075 (± 0.01%)}	_~	_1,357,783	_1,358,758	_{p=0.259 n=12}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Parse Time}	_{0.068s (± 6.48%)}	_{0.070s (± 4.44%)}	_~	_0.059s	_0.076s	_{p=0.223 n=12}
_{Bind Time}	_{0.034s (± 8.03%)}	_{0.032s (± 7.53%)}	_~	_0.024s	_0.039s	_{p=0.701 n=12}
_{Check Time}	_{0.524s (± 1.98%)}	_{0.495s (± 2.09%)}	_{🟩-0.029s (- 5.61%)}	_0.469s	_0.525s	_{p=0.000 n=12}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Total Time}	_{0.638s (± 1.88%)}	_{0.607s (± 1.67%)}	_{🟩-0.031s (- 4.82%)}	_0.586s	_0.632s	_{p=0.000 n=12}
_{vscode - native}
_Errors	₁₀	₁₀	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_7,281,695	_7,281,695	_~	_~	_~	_{p=1.000 n=12}
_Types	_4,286,835	_4,286,835	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{5,404,797k (± 0.01%)}	_{5,404,599k (± 0.02%)}	_~	_5,401,911k	_5,407,434k	_{p=0.843 n=12}
_{Memory Allocs}	_{62,554,948 (± 0.01%)}	_{62,549,750 (± 0.01%)}	_~	_62,541,032	_62,564,139	_{p=0.178 n=12}
_{Config Time}	_{0.069s (± 0.57%)}	_{0.069s (± 0.73%)}	_~	_0.068s	_0.070s	_{p=0.474 n=12}
_{Parse Time}	_{1.272s (± 1.91%)}	_{1.269s (± 1.12%)}	_~	_1.226s	_1.300s	_{p=0.452 n=12}
_{Bind Time}	_{0.420s (± 9.44%)}	_{0.408s (± 5.35%)}	_~	_0.388s	_0.514s	_{p=0.853 n=12}
_{Check Time}	_{11.576s (± 0.54%)}	_{11.396s (± 0.22%)}	_{-0.180s (- 1.56%)}	_11.322s	_11.477s	_{p=0.000 n=12}
_{Emit Time}	_{3.906s (± 4.45%)}	_{3.917s (± 3.81%)}	_~	_3.587s	_4.311s	_{p=0.843 n=12}
_{Total Time}	_{17.313s (± 1.12%)}	_{17.129s (± 0.85%)}	_~	_16.830s	_17.530s	_{p=0.143 n=12}
_{webpack - native}
_Errors	₆₁₇	₆₁₇	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_922,055	_922,055	_~	_~	_~	_{p=1.000 n=12}
_Types	_644,701	_644,701	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{776,051k (± 0.02%)}	_{745,341k (± 0.02%)}	_{🟩-30,711k (- 3.96%)}	_745,061k	_745,730k	_{p=0.000 n=12}
_{Memory Allocs}	_{6,571,731 (± 0.02%)}	_{6,572,291 (± 0.02%)}	_~	_6,570,285	_6,575,311	_{p=0.410 n=12}
_{Config Time}	_0.007s	_0.007s	_~	_~	_~	_{p=1.000 n=12}
_{Parse Time}	_{0.199s (± 4.14%)}	_{0.200s (± 4.69%)}	_~	_0.174s	_0.228s	_{p=0.788 n=12}
_{Bind Time}	_{0.063s (± 9.94%)}	_{0.059s (±11.31%)}	_~	_0.050s	_0.089s	_{p=0.181 n=12}
_{Check Time}	_{1.683s (± 0.59%)}	_{1.665s (± 0.44%)}	_{-0.018s (- 1.04%)}	_1.644s	_1.684s	_{p=0.005 n=12}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Total Time}	_{1.987s (± 0.57%)}	_{1.970s (± 0.67%)}	_~	_1.944s	_2.003s	_{p=0.058 n=12}
_{xstate-main - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_640,494	_640,494	_~	_~	_~	_{p=1.000 n=12}
_Types	_387,992	_387,992	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{398,392k (± 0.02%)}	_{386,687k (± 0.03%)}	_{-11,705k (- 2.94%)}	_386,391k	_387,076k	_{p=0.000 n=12}
_{Memory Allocs}	_{3,990,895 (± 0.07%)}	_{3,992,618 (± 0.09%)}	_~	_3,980,548	_4,000,566	_{p=0.410 n=12}
_{Config Time}	_0.002s	_0.002s	_~	_~	_~	_{p=1.000 n=12}
_{Parse Time}	_{0.088s (± 3.22%)}	_{0.087s (± 2.58%)}	_~	_0.081s	_0.092s	_{p=0.578 n=12}
_{Bind Time}	_{0.027s (±12.22%)}	_{0.026s (± 8.93%)}	_~	_0.023s	_0.036s	_{p=0.772 n=12}
_{Check Time}	_{0.618s (± 0.96%)}	_{0.611s (± 0.79%)}	_~	_0.600s	_0.625s	_{p=0.071 n=12}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Total Time}	_{0.741s (± 0.92%)}	_{0.733s (± 0.77%)}	_~	_0.718s	_0.746s	_{p=0.085 n=12}

System info unknown

Hosts

native

Scenarios

Compiler-Unions - native
angular-1 - native
arktype - native
mui-docs - native
sentry - native
social-app - native
strada-build-src - native
strada-compiler - native
t3code-server - native
ts-pre-modules - native
vscode - native
webpack - native
xstate-main - native

_Benchmark	_Name	_Iterations
_Current	_pr	₁₂
_Baseline	_baseline	₁₂

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Copilot AI balanced review requested due to automatic review settings October 26, 2026 19:18

github-project-automation Bot added this to PR Backlog Oct 26, 2026

github-project-automation Bot moved this to Not started in PR Backlog Oct 26, 2026

typescript-automation Bot assigned Jake Bailey (jakebailey) Oct 26, 2026

typescript-automation Bot added Author: Team For Uncommitted Bug PR for untriaged, rejected, closed or missing bug labels Oct 26, 2026

Copilot started reviewing on behalf of Jake Bailey (jakebailey) October 26, 2026 19:19

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Ryan Cavanaugh (RyanCavanaugh) approved these changes Oct 27, 2026

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github-project-automation Bot moved this from Not started to Needs merge in PR Backlog Oct 27, 2026

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Merged via the queue into microsoft:main with commit 1f82f36 Oct 27, 2026
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Jake Bailey (jakebailey) deleted the printer-grow-whole-file branch October 27, 2026 16:30

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Only pre-size the printer buffer when printing a whole file - #64972

Only pre-size the printer buffer when printing a whole file#64972
Jake Bailey (jakebailey) merged 1 commit into
microsoft:mainfrom
jakebailey:printer-grow-whole-file

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