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Shelley Vohr
e38eede0e5
Contexts that are not deserialized from the built-in snapshot -- worker threads, and the main context of embedders that create their own isolate or of `node --no-node-snapshot` -- compile (with the code cache at best) every builtin the bootstrap touches, so each eagerly required builtin is startup time (~0.15-0.4 ms apiece). A number of them are only required eagerly so that they end up in the snapshot, or for features the bootstrap path never uses. Load lazily what those paths do not need: - is_main_thread.js: preload util, url, the ESM loader (translators, resolver, module_job/map, source maps, node:module, vm modules, mime, data_url, the TypeScript stripper), internal/blob and internal/dns/utils only while building a snapshot; they load on first use otherwise. - fs: internal/blob (+ internal/encoding and its tables) is only used by fs.openAsBlob(). - internal/url: internal/data_url (+ internal/mime) is only used by the Buffer-returning file URL helpers. - internal/process/execution, the CommonJS loader, esm/translators and esm/load: the TypeScript stripper and data: URL helpers are only needed for TypeScript sources / data: URLs. - pre_execution: internal/dns/utils (+ internal/net) is only needed up front to validate an explicit --dns-result-order or to register the resolver's snapshot serializer; the default order becomes the variable's initializer. - internal/worker: event_loop_utilization and error_serdes are only needed once a sub-worker's ELU is read or it reports an error. - worker_threads: `locks` is defined lazily, like util's lazy exports. Main-thread startup with the snapshot is unchanged (the same modules are preloaded into it; the bootstrap-modules test lists are adjusted). A bare worker compiles 95 -> 83 builtins (cold start -5%); without the snapshot an empty CommonJS entry point compiles 76 -> 59 builtins and an empty ES module entry point 76 -> 69. Signed-off-by: Shelley Vohr <shelley.vohr@gmail.com> PR-URL: https://github.com/nodejs/node/pull/65329 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com> Reviewed-By: Matteo Collina <matteo.collina@gmail.com> Reviewed-By: Chengzhong Wu <legendecas@gmail.com> Reviewed-By: Aviv Keller <me@aviv.sh>
64 lines
1.1 KiB
JavaScript
64 lines
1.1 KiB
JavaScript
'use strict';
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const { defineLazyProperties } = require('internal/util');
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const {
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isInternalThread,
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isMainThread,
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SHARE_ENV,
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resourceLimits,
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setEnvironmentData,
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getEnvironmentData,
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threadId,
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threadName,
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Worker,
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} = require('internal/worker');
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const {
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MessagePort,
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MessageChannel,
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markAsUncloneable,
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moveMessagePortToContext,
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receiveMessageOnPort,
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BroadcastChannel,
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} = require('internal/worker/io');
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const {
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postMessageToThread,
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} = require('internal/worker/messaging');
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const {
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markAsUntransferable,
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isMarkedAsUntransferable,
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} = require('internal/buffer');
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module.exports = {
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isInternalThread,
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isMainThread,
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MessagePort,
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MessageChannel,
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markAsUncloneable,
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markAsUntransferable,
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isMarkedAsUntransferable,
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moveMessagePortToContext,
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receiveMessageOnPort,
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resourceLimits,
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postMessageToThread,
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threadId,
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threadName,
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SHARE_ENV,
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Worker,
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parentPort: null,
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workerData: null,
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BroadcastChannel,
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setEnvironmentData,
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getEnvironmentData,
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};
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// The Web Locks API implementation is only needed once `locks` is used.
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defineLazyProperties(
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module.exports,
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'internal/locks',
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['locks'],
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);
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