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Title: lib: reduce startup time by BridgeAR · Pull Request #20567 · nodejs/node · GitHub

Open Graph Title: lib: reduce startup time by BridgeAR · Pull Request #20567 · nodejs/node

X Title: lib: reduce startup time by BridgeAR · Pull Request #20567 · nodejs/node

Description: This reduces the overall startup time by > 10 % on my local machine (comparing 100 runs) by lazy loading a couple modules. At the same time it also reduces the memory usage: node-cp$ out/Release/node -e 'console.log(process.memoryUsage())' { rss: 38727680, heapTotal: 6086656, heapUsed: 3687208, external: 8264 } node-cp$ node -e 'console.log(process.memoryUsage())' { rss: 24526848, heapTotal: 6610944, heapUsed: 4465864, external: 8672 } In the bootstrap phase our code is not optimized by the compiler and each file extra takes a while. We load a total of 96 NativeModules and Bindings when just executing node -e 'console.log(process.moduleLoadList.length)'. With this patch that is reduced to 73! There might still be a few more modules that could be removed but it is becoming more tricky now. I tried to use a very minimal invasive approach to actually only lazy load where it made sense. If a module would be necessary one way or the other, I did not rewrite that. Ping @joyeecheung @hashseed @mcollina I wonder if it is possible to reduce the streams files a bit further. Checklist make -j4 test (UNIX), or vcbuild test (Windows) passes tests and/or benchmarks are included documentation is changed or added commit message follows commit guidelines

Open Graph Description: This reduces the overall startup time by > 10 % on my local machine (comparing 100 runs) by lazy loading a couple modules. At the same time it also reduces the memory usage: node-cp$ out/Release...

X Description: This reduces the overall startup time by > 10 % on my local machine (comparing 100 runs) by lazy loading a couple modules. At the same time it also reduces the memory usage: node-cp$ out/Rel...

Opengraph URL: https://github.com/nodejs/node/pull/20567

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35cc355 string_decoder: lazy loaded BridgeAR May 6, 2018 https://github.com/nodejs/node/pull/20567/commits/35cc3550ea5e4d03806b3317264a2b45534ae568
d480b63 querystring: lazy loaded BridgeAR May 6, 2018 https://github.com/nodejs/node/pull/20567/commits/d480b632f9bc4b004f69c530bf6cf47a92b2c004
5c144fa readline: lazy loaded BridgeAR May 6, 2018 https://github.com/nodejs/node/pull/20567/commits/5c144fabf64327c6d5ccd21b0d4f0df0c489d7b8
a18174b os: lazy loaded BridgeAR May 6, 2018 https://github.com/nodejs/node/pull/20567/commits/a18174b123f35d5a1b7eaa1fcc30519c8a12881e
02c3b4b dns: lazy loaded BridgeAR May 6, 2018 https://github.com/nodejs/node/pull/20567/commits/02c3b4b154e053a262e6fc16083c76089930293c
9168e15 bootstrap: only load inspector stuff if necessary BridgeAR May 6, 2018 https://github.com/nodejs/node/pull/20567/commits/9168e1502ff08917822fb4e730a6f2bfdbbb1644
1dfa4ec esm: lazy load necessary loaders BridgeAR May 6, 2018 https://github.com/nodejs/node/pull/20567/commits/1dfa4ec6b04a834de2431cca8023e0c53adefca2
246ab38 cluster: remove obsolete array allocation BridgeAR May 6, 2018 https://github.com/nodejs/node/pull/20567/commits/246ab388814df5a2e046d2703530ee52e2c48c30
e8ae9a4 trace_events: lazy loaded BridgeAR May 6, 2018 https://github.com/nodejs/node/pull/20567/commits/e8ae9a4fa9683919b2a1e1ab03afff1db7121937
ce21afd lib: use capital letters in comments BridgeAR May 7, 2018 https://github.com/nodejs/node/pull/20567/commits/ce21afdda47dda04d6840835c3718c2f5b60fbc6
a093ed3 bootstrap: remove unnecessary require BridgeAR May 7, 2018 https://github.com/nodejs/node/pull/20567/commits/a093ed32adf24e8bba127d15b878cf3df22caf35
4733c2a tools: stricter eslint rule for globals BridgeAR May 7, 2018 https://github.com/nodejs/node/pull/20567/commits/4733c2ae632b4239803cefe827406080a1c4026d
e0080ce assert,util: lazy load comparison functions BridgeAR May 7, 2018 https://github.com/nodejs/node/pull/20567/commits/e0080ce2ac48226ac58b84b9fa79635791a0ed9b
bd96a9d async_hook: lazy loading for startup performance BridgeAR May 7, 2018 https://github.com/nodejs/node/pull/20567/commits/bd96a9d5f333e06b0834d241ff6a25f2e06bb0ec
d31581f bootstrap: do not call performance hooks BridgeAR May 7, 2018 https://github.com/nodejs/node/pull/20567/commits/d31581f61d0952066be406031889d4a6f0cd0c94
0093e0d stream: lazy load ReadableAsyncIterator BridgeAR May 7, 2018 https://github.com/nodejs/node/pull/20567/commits/0093e0d173a4e795aa8a5ef6151d7db078a0b744
0b31adc console: lazy load cli BridgeAR May 7, 2018 https://github.com/nodejs/node/pull/20567/commits/0b31adca20ade1801825b03aa782cf2458705b69
5c3a245 stream: lazy load end-of-stream BridgeAR May 7, 2018 https://github.com/nodejs/node/pull/20567/commits/5c3a245603e8f4de7dea33bdb8d4d70faac6d736
b0bbbba net: lazy load dns BridgeAR May 7, 2018 https://github.com/nodejs/node/pull/20567/commits/b0bbbba97e558fc92b0dc229be03dddd9b544a8c
3ca0b58 test: add loaded modules test BridgeAR May 7, 2018 https://github.com/nodejs/node/pull/20567/commits/3ca0b58759baa4bb2a25e76111fe75781f122373
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