v8-compile-cache-lib
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3.0.1 • Public • Published

v8-compile-cache-lib

Fork of v8-compile-cache exposed as an API for programmatic usage in other libraries and tools.


Build status

v8-compile-cache-lib 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

  1. Add the dependency:
$ npm install --save v8-compile-cache-lib
  1. Then, in your entry module add:
require('v8-compile-cache-lib').install();

.install() 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-lib.

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-lib. 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/cspotcode/v8-compile-cache-lib/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

Readme

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Install

npm i v8-compile-cache-lib

Weekly Downloads

11,695,142

Version

3.0.1

License

MIT

Unpacked Size

18.2 kB

Total Files

6

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Collaborators

  • cspotcode