Tim van der Lippe
6d109a9d45
This also adds Python-2.0 to the list of accepted licenses. Lastly, it fixes a bug where the package.json files were incorrectly reordered. For the `exports` of a particular package, the order that the entrypoints are defined in is crucial. Therefore, we should not alter the order of entrypoints and instead maintain the originally defined ordering. We can use an `OrderedDict` to ensure that Python always loads the JSON files in the same order. DISABLE_THIRD_PARTY_CHECK=NPM update R=jacktfranklin@chromium.org Bug: none Change-Id: I5a309782de6015edea6ba3b502aa0db1f008d973 Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2692909 Auto-Submit: Tim van der Lippe <tvanderlippe@chromium.org> Reviewed-by: Jack Franklin <jacktfranklin@chromium.org> Commit-Queue: Tim van der Lippe <tvanderlippe@chromium.org>
v8-compile-cache
v8-compile-cache attaches a require hook to use V8's code cache to speed up instantiation time. The "code cache" is the work of parsing and compiling done by V8.
The ability to tap into V8 to produce/consume this cache was introduced in Node v5.7.0.
Usage
- Add the dependency:
$ npm install --save v8-compile-cache
- Then, in your entry module add:
require('v8-compile-cache');
Requiring v8-compile-cache in Node <5.7.0 is a noop – but you need at least Node 4.0.0 to support the ES2015 syntax used by v8-compile-cache.
Options
Set the environment variable DISABLE_V8_COMPILE_CACHE=1 to disable the cache.
Cache directory is defined by environment variable V8_COMPILE_CACHE_CACHE_DIR or defaults to <os.tmpdir()>/v8-compile-cache-<V8_VERSION>.
Internals
Cache files are suffixed .BLOB and .MAP corresponding to the entry module that required v8-compile-cache. The cache is entry module specific because it is faster to load the entire code cache into memory at once, than it is to read it from disk on a file-by-file basis.
Benchmarks
See https://github.com/zertosh/v8-compile-cache/tree/master/bench.
Load Times:
| Module | Without Cache | With Cache |
|---|---|---|
babel-core |
218ms |
185ms |
yarn |
153ms |
113ms |
yarn (bundled) |
228ms |
105ms |
^ Includes the overhead of loading the cache itself.
Acknowledgements
FileSystemBlobStoreandNativeCompileCacheare based on Atom's implementation of their v8 compile cache:mkdirpSyncis based on: