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Shelley Vohr
26bd28cbdb
Environments created from the built-in snapshot get the builtins' code cache from that snapshot. An embedder that bootstraps an Environment from scratch (its own isolate and context, no EmbedderSnapshotData) has no way to provide one: every builtin the bootstrap touches is compiled from source in every such process, and each of them then serializes a fresh cache (SaveCodeCache) that only a later worker thread would ever consume. Add node::EmbedderBuiltinCodeCache for that case. Its entries pair a builtin id with a v8::ScriptCompiler::CachedData; Generate(context) compiles every builtin in a context of the right kind of isolate and returns them for a build step to embed, and SetBuiltinCodeCache(isolate_data, cache) attaches them to an IsolateData, next to where a snapshot's code cache lives, so that every Environment created from it afterwards starts with them. The setter runs CachedData::CompatibilityCheck() against the isolate first and returns the result, leaving the IsolateData untouched for a cache made with another V8 version, flag set or read-only snapshot. Entries from a snapshot still merge with it (RefreshCodeCache() now merges instead of assuming a single call). CreateEnvironment() plus LoadEnvironment() of an empty script goes from about 38 ms to 13 ms with a cache attached. ProcessInitializationFlags::kNoHarvestBuiltinCodeCache stops serializing caches for builtins compiled without one, for embedders that supply their own or never create workers. The default is unchanged because worker threads copy the harvested cache. A cctest generates a cache, attaches it, checks that a new Environment's bootstrap compiles from it and that a corrupted cache is refused; embedtest gains --no-harvest-builtin-code-cache for a test that a worker does or does not find a harvested cache depending on the flag. Signed-off-by: Shelley Vohr <shelley.vohr@gmail.com> PR-URL: https://github.com/nodejs/node/pull/65352 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Chengzhong Wu <legendecas@gmail.com>
26 lines
1.1 KiB
JavaScript
26 lines
1.1 KiB
JavaScript
'use strict';
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// By default a builtin compiled without a code cache serializes one that worker
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// threads then start from; with kNoHarvestBuiltinCodeCache it does not.
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const common = require('../common');
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const tmpdir = require('../common/tmpdir');
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const assert = require('assert');
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const { spawnSyncAndAssert } = require('../common/child_process');
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tmpdir.refresh();
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const embedtest = common.resolveBuiltBinary('embedtest');
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const workerScript = 'new (require("worker_threads").Worker)("", { eval: true })';
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function workerCompileLog(args) {
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let log;
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spawnSyncAndAssert(
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embedtest, ['--', ...args, workerScript],
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{ cwd: tmpdir.path, env: { ...process.env, NODE_DEBUG_NATIVE: 'CODE_CACHE' } },
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{ stderr(output) { log = output; return true; } });
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const worker = log.slice(log.lastIndexOf('Compiling internal/bootstrap/realm'));
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assert.notStrictEqual(worker, log);
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return worker;
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}
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assert.match(workerCompileLog([]), /Code cache of internal\/bootstrap\/node \(\w+\) is accepted/);
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assert.match(workerCompileLog(['--no-harvest-builtin-code-cache']),
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/Compiling internal\/bootstrap\/node without code cache/);
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