Tim van der Lippe
2a1ede5c26
`manage_node_deps.py` was changed in https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2259834 to add line endings at the end of the package.json file However, `npm run install-deps` was not rerun to add the line endings. To prevent future CLs that add deps to include the line ending changes, fix them in this CL. R=mathias@chromium.org Change-Id: Id4ee0003520c4aa0cb55494cdf64df57e31a86d7 Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2263952 Commit-Queue: Tim van der Lippe <tvanderlippe@chromium.org> Commit-Queue: Mathias Bynens <mathias@chromium.org> Auto-Submit: Tim van der Lippe <tvanderlippe@chromium.org> Reviewed-by: Mathias Bynens <mathias@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.
Internals
The caches are stored in $TMP/v8-compile-cache/V8_VERSION, where there are .BLOB and .MAP files 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: