Performance impact of async_hooks
January 17, 2018 ยท View on GitHub
This is a simple demo of the potential performance impact of async_hooks
on Promise heavy workloads. This repository contains the popular
Bluebird benchmarks and the
so-called Wikipedia Promise benchmark with and
without async_hooks (running with native promises).
To measure the actual impact there's a version of each benchmark with
an empty init hook, i.e. we prepend the following code to the actual
code under test:
const async_hooks = require('async_hooks');
const hook = async_hooks.createHook({
init(asyncId, type, triggerAsyncId) { }
});
hook.enable();
We also test with all hooks (i.e. init, before, after, destroy
and promiseResolve) using the following snippet:
const async_hooks = require('async_hooks');
const hook = async_hooks.createHook({
init(asyncId, type, triggerAsyncId, resource) { },
before(asyncId) { },
after(asyncId) { },
destroy(asyncId) { },
promiseResolve(asyncId) { },
});
hook.enable();
Results
Here the results of running the Promise micro benchmarks with and without
async_hooks enabled:
| Benchmark | Node 8.9.4 | Node 9.4.0 |
|---|---|---|
| Bluebird-doxbee (regular) | 226 ms | 189 ms |
| Bluebird-doxbee (init hook) | 383 ms | 341 ms |
| Bluebird-doxbee (all hooks) | 440 ms | 411 ms |
| Bluebird-parallel (regular) | 924 ms | 696 ms |
| Bluebird-parallel (init hook) | 1380 ms | 1050 ms |
| Bluebird-parallel (all hooks) | 1488 ms | 1220 ms |
| Wikipedia (regular) | 993 ms | 804 ms |
| Wikipedia (init hook) | 2025 ms | 1893 ms |
| Wikipedia (all hooks) | 2109 ms | 2124 ms |
And we also ran some more realistic benchmarks, based on hapi and
koa, with and without async_hooks enabled:
| Benchmark | Node 9.4.0 |
|---|---|
| hapi (asynchooks) | 6026.9 reqs |
| hapi (regular) | 9024.19 reqs |
| koa (asynchooks) | 11508.6 reqs |
| koa (regular) | 12592.55 reqs |
The koa benchmark is pretty flaky, so the performance difference could be
within noise and thus not relevant.
Bluebird benchmarks
The files here are modified from: https://github.com/petkaantonov/bluebird/tree/master/benchmark
The current version is based on bluebird@c0d4472cecd523c2f9d4805a23d87be3cfe03b41
Wikipedia Benchmark
The files here are modified from: https://github.com/wikimedia/web-stream-util
The current version is based on web-stream-util@fc76740cd6a73dcb044251a233bc3c868d3c9a77