41 lines
1.7 KiB
TypeScript
41 lines
1.7 KiB
TypeScript
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import { javaScriptRuntime } from "../domain/runtimeVersion.js";
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const MIB = 1024 * 1024;
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/**
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* Commit reserved for Bun itself above a worker's heap budget.
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*
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* Measured on Windows x64 (Bun 1.4.2, 32 logical processors) as the peak Job
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* Object commit of each REA worker on a trivial input: `bun -e 1` commits
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* 52 MiB, while the source-map codec (278-368 MiB), HAR decoder (300-345 MiB)
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* and JavaScript analysis worker (321-346 MiB) commit up to 368 MiB before any
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* real workload because JavaScriptCore commits parsed and compiled module code
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* and per-thread runtime state. 512 MiB covers that peak with about 40%
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* margin for hosts with other processor counts or module layouts.
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*/
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export const BUN_WORKER_RUNTIME_RESERVE_BYTES = 512 * MIB;
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/** Runtime facts that decide whether V8 heap flags bound a worker. */
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export interface JavaScriptWorkerHost {
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readonly platform: NodeJS.Platform;
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readonly versions: {
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readonly node: string;
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readonly bun?: string | undefined;
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};
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}
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/**
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* Process commit limit for a JavaScript worker launched on `process.execPath`.
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*
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* Node.js enforces each worker's V8 heap flags, so it receives no process
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* limit (null) and its launch is unchanged. Bun ignores those flags; on Windows
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* the owned Job Object then enforces the worker's heap budget plus Bun's
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* runtime reserve. Bun elsewhere has no owned enforcement and also gets null.
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*/
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export const javaScriptWorkerMemoryLimitBytes = (
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heapBudgetMiB: number,
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host: JavaScriptWorkerHost = process,
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): number | null =>
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host.platform === "win32" && javaScriptRuntime(host.versions).id === "bun"
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? heapBudgetMiB * MIB + BUN_WORKER_RUNTIME_RESERVE_BYTES
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: null;
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