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# v8-compile-cache
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[](https://travis-ci.org/zertosh/v8-compile-cache)
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`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.
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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/).
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## Usage
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1. Add the dependency:
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```sh
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$ npm install --save v8-compile-cache
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```
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2. Then, in your entry module add:
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```js
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require('v8-compile-cache');
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```
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**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`.**
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## Options
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Set the environment variable `DISABLE_V8_COMPILE_CACHE=1` to disable the cache.
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Cache directory is defined by environment variable `V8_COMPILE_CACHE_CACHE_DIR` or defaults to `<os.tmpdir()>/v8-compile-cache-<V8_VERSION>`.
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## Internals
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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.
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## Benchmarks
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See https://github.com/zertosh/v8-compile-cache/tree/master/bench.
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**Load Times:**
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| Module | Without Cache | With Cache |
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| ---------------- | -------------:| ----------:|
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| `babel-core` | `218ms` | `185ms` |
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| `yarn` | `153ms` | `113ms` |
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| `yarn` (bundled) | `228ms` | `105ms` |
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_^ Includes the overhead of loading the cache itself._
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## Acknowledgements
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* `FileSystemBlobStore` and `NativeCompileCache` are based on Atom's implementation of their v8 compile cache:
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- https://github.com/atom/atom/blob/b0d7a8a/src/file-system-blob-store.js
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- https://github.com/atom/atom/blob/b0d7a8a/src/native-compile-cache.js
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* `mkdirpSync` is based on:
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- https://github.com/substack/node-mkdirp/blob/f2003bb/index.js#L55-L98
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