https://github.com/sandinmyjoints/event-loop-demo
https://github.com/sandinmyjoints/event-loop-demo
Last synced: 2 months ago
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- Host: GitHub
- URL: https://github.com/sandinmyjoints/event-loop-demo
- Owner: sandinmyjoints
- Created: 2021-03-16T15:54:08.000Z (about 4 years ago)
- Default Branch: main
- Last Pushed: 2021-03-16T16:18:58.000Z (about 4 years ago)
- Last Synced: 2025-02-08T09:12:55.878Z (4 months ago)
- Language: JavaScript
- Size: 1.95 KB
- Stars: 1
- Watchers: 2
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
Awesome Lists containing this project
README
# event loop demo
## Setup
Generate a large file filled with random characters.
head -c 300000000 < /dev/urandom | base64 > large-file
## Sync vs async
$ diff compress-async.mjs compress-sync.mjs
``` diff
--- compress-async.mjs 2021-03-16 11:39:21.000000000 -0400
+++ compress-sync.mjs 2021-03-16 11:38:46.000000000 -0400
@@ -27,12 +27,12 @@
const buffer = await fs.readFile('./large-file');
-// Start logging every 100,000th tick.
-logTicks(100_000);
+// Start logging every tick.
+logTicks(1);
-// Asynchronously compress file.
-console.log(`tick number before gzip (async): ${count}`);
-await promisify(zlib.gzip)(buffer);
-console.log(`tick number after gzip (async): ${count}`);
+// Synchronously compress file.
+console.log(`tick number before gzipSync: ${count}`);
+zlib.gzipSync(buffer);
+console.log(`tick number after gzipSync: ${count}`);
isDone = true;
```
## Run
$ node log-ticks.mjs
$ node compress-async.mjs
$ node compress-sync.mjs
## Links
- https://nodejs.org/en/docs/guides/blocking-vs-non-blocking/
- https://nodejs.org/en/docs/guides/event-loop-timers-and-nexttick/
- https://nodejs.org/en/docs/guides/dont-block-the-event-loop/
- https://github.com/sidorares/node-mysql2/issues/1202