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Merge pull request #12990 from webpack/bugfix/memory-leak-in-ic
memory usage improvements, add GC support for memory cache, persistent cache only mode
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,129 @@ | ||
| /* | ||
| MIT License http://www.opensource.org/licenses/mit-license.php | ||
| Author Tobias Koppers @sokra | ||
| */ | ||
|
|
||
| "use strict"; | ||
|
|
||
| const Cache = require("../Cache"); | ||
|
|
||
| /** @typedef {import("webpack-sources").Source} Source */ | ||
| /** @typedef {import("../Cache").Etag} Etag */ | ||
| /** @typedef {import("../Compiler")} Compiler */ | ||
| /** @typedef {import("../Module")} Module */ | ||
|
|
||
| class MemoryWithGcCachePlugin { | ||
| constructor({ maxGenerations }) { | ||
| this._maxGenerations = maxGenerations; | ||
| } | ||
| /** | ||
| * Apply the plugin | ||
| * @param {Compiler} compiler the compiler instance | ||
| * @returns {void} | ||
| */ | ||
| apply(compiler) { | ||
| const maxGenerations = this._maxGenerations; | ||
| /** @type {Map<string, { etag: Etag | null, data: any }>} */ | ||
| const cache = new Map(); | ||
| /** @type {Map<string, { entry: { etag: Etag | null, data: any }, until: number }>} */ | ||
| const oldCache = new Map(); | ||
| let generation = 0; | ||
| let cachePosition = 0; | ||
| const logger = compiler.getInfrastructureLogger("MemoryWithGcCachePlugin"); | ||
| compiler.hooks.afterDone.tap("MemoryWithGcCachePlugin", () => { | ||
| generation++; | ||
| let clearedEntries = 0; | ||
| let lastClearedIdentifier; | ||
| for (const [identifier, entry] of oldCache) { | ||
| if (entry.until > generation) break; | ||
|
|
||
| oldCache.delete(identifier); | ||
| if (cache.get(identifier) === undefined) { | ||
| cache.delete(identifier); | ||
| clearedEntries++; | ||
| lastClearedIdentifier = identifier; | ||
| } | ||
| } | ||
| if (clearedEntries > 0 || oldCache.size > 0) { | ||
| logger.log( | ||
| `${cache.size - oldCache.size} active entries, ${ | ||
| oldCache.size | ||
| } recently unused cached entries${ | ||
| clearedEntries > 0 | ||
| ? `, ${clearedEntries} old unused cache entries removed e. g. ${lastClearedIdentifier}` | ||
| : "" | ||
| }` | ||
| ); | ||
| } | ||
| let i = (cache.size / maxGenerations) | 0; | ||
| let j = cachePosition >= cache.size ? 0 : cachePosition; | ||
| cachePosition = j + i; | ||
| for (const [identifier, entry] of cache) { | ||
| if (j !== 0) { | ||
| j--; | ||
| continue; | ||
| } | ||
| if (entry !== undefined) { | ||
| // We don't delete the cache entry, but set it to undefined instead | ||
| // This reserves the location in the data table and avoids rehashing | ||
| // when constantly adding and removing entries. | ||
| // It will be deleted when removed from oldCache. | ||
| cache.set(identifier, undefined); | ||
| oldCache.delete(identifier); | ||
| oldCache.set(identifier, { | ||
| entry, | ||
| until: generation + maxGenerations | ||
| }); | ||
| if (i-- === 0) break; | ||
| } | ||
| } | ||
| }); | ||
| compiler.cache.hooks.store.tap( | ||
| { name: "MemoryWithGcCachePlugin", stage: Cache.STAGE_MEMORY }, | ||
| (identifier, etag, data) => { | ||
| cache.set(identifier, { etag, data }); | ||
| } | ||
| ); | ||
| compiler.cache.hooks.get.tap( | ||
| { name: "MemoryWithGcCachePlugin", stage: Cache.STAGE_MEMORY }, | ||
| (identifier, etag, gotHandlers) => { | ||
| const cacheEntry = cache.get(identifier); | ||
| if (cacheEntry === null) { | ||
| return null; | ||
| } else if (cacheEntry !== undefined) { | ||
| return cacheEntry.etag === etag ? cacheEntry.data : null; | ||
| } | ||
| const oldCacheEntry = oldCache.get(identifier); | ||
| if (oldCacheEntry !== undefined) { | ||
| const cacheEntry = oldCacheEntry.entry; | ||
| if (cacheEntry === null) { | ||
| oldCache.delete(identifier); | ||
| cache.set(identifier, cacheEntry); | ||
| return null; | ||
| } else { | ||
| if (cacheEntry.etag !== etag) return null; | ||
| oldCache.delete(identifier); | ||
| cache.set(identifier, cacheEntry); | ||
| return cacheEntry.data; | ||
| } | ||
| } | ||
| gotHandlers.push((result, callback) => { | ||
| if (result === undefined) { | ||
| cache.set(identifier, null); | ||
| } else { | ||
| cache.set(identifier, { etag, data: result }); | ||
| } | ||
| return callback(); | ||
| }); | ||
| } | ||
| ); | ||
| compiler.cache.hooks.shutdown.tap( | ||
| { name: "MemoryWithGcCachePlugin", stage: Cache.STAGE_MEMORY }, | ||
| () => { | ||
| cache.clear(); | ||
| oldCache.clear(); | ||
| } | ||
| ); | ||
| } | ||
| } | ||
| module.exports = MemoryWithGcCachePlugin; |
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