forked from projectmoon/tenebrous-dicebot
56 lines
2.1 KiB
Markdown
56 lines
2.1 KiB
Markdown
|
# v8-compile-cache
|
|||
|
|
|
|||
|
|
[](https://travis-ci.org/zertosh/v8-compile-cache)
|
|||
|
|
|
|||
|
|
`v8-compile-cache` attaches a `require` hook to use [V8's code cache](https://v8project.blogspot.com/2015/07/code-caching.html) 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](https://nodejs.org/en/blog/release/v5.7.0/).
|
|||
|
|
|
|||
|
|
## Usage
|
|||
|
|
|
|||
|
|
1. Add the dependency:
|
|||
|
|
|
|||
|
|
```sh
|
|||
|
|
$ npm install --save v8-compile-cache
|
|||
|
|
```
|
|||
|
|
|
|||
|
|
2. Then, in your entry module add:
|
|||
|
|
|
|||
|
|
```js
|
|||
|
|
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
|
|||
|
|
|
|||
|
|
* `FileSystemBlobStore` and `NativeCompileCache` are based on Atom's implementation of their v8 compile cache:
|
|||
|
|
- https://github.com/atom/atom/blob/b0d7a8a/src/file-system-blob-store.js
|
|||
|
|
- https://github.com/atom/atom/blob/b0d7a8a/src/native-compile-cache.js
|
|||
|
|
* `mkdirpSync` is based on:
|
|||
|
|
- https://github.com/substack/node-mkdirp/blob/f2003bb/index.js#L55-L98
|