Scaling NodeJS beyond the ordinary

These are the slides to accompany the talk I gave at JSConf Iceland 2018.

1. Scaling NodeJS Beyond the ordinary Abhinav Rastogi Lead UI Engineer _abhinavrastogi
3. 150M Registered Users 500K Phones sold in 15 seconds 200M Visits over 5 days during annual sale event
4. – Andre Bondi “Scalability is the capability of a system to handle a growing amount of work, or its potential to be enlarged to accommodate that growth.”
5. Why should it concern the JS community?
6. Why should it concern the JS community? • JS is running on servers now • Failure is shifting to application code • Failure is better handled by devs
7. Types of Scalability x y z Add more machines Add more resources Application layer
8. Horizontal Scaling
9. Horizontal Scaling Machine Node API
10. Horizontal Scaling Machine Node API Machine Node ELB
11. Vertical Scaling
12. Vertical Scaling Machine Node API
13. Vertical Scaling Machine Node API Node ??
14. Application Layer Optimisations
15. The Optimisation Cycle Load Test Find Bottleneck Fix Issues
16. network, cpu, memory, disk
17. network bandwidth
18. network bandwidth
19. 1000 kb per page 100 rps per machine 100 machines = 10gbps
20. compression
21. const app = express() app.use(compression)
22. co-hosted nginx
23. co-hosted nginx Machine Node Node PM2 nginx API ELB
24. network profiling
25. netstat / ss lsof watch
26. everything is a file in unix!
27. ulimit
28. ulimit core file size (blocks, -c) 0 file size (blocks, -f) unlimited pending signals (-i) 32767 max locked memory (kbytes, -l) 32 max memory size (kbytes, -m) unlimited open files (-n) 1024 max user processes (-u) 50
29. increase the limits / reduce the usage
30. keep-alive header
31. keep-alive header Object.assign(headers, { 'Connection': 'keep-alive', 'Keep-Alive': 'timeout=200' });
32. connection pooling
33. connection pooling const http = require('http'); fetch(url, { agent: new http.Agent({ keepAlive: true, maxSockets: 24 }) });
34. ephemeral ports
35. tcp connection states
36. tcp connection states source: http://cnp3book.info.ucl.ac.be/1st/html/transport/transport.html
37. tcp connection states
38. cpu
39. cpu profiling
40. node --prof app.js
41. import crypto from 'crypto'; app.get('/auth', (req, res) => { const hash = crypto.pbkdf2Sync(password, users[username].salt, 100, 512); if (users[username].hash.toString() === hash.toString()) { res.sendStatus(200); } else { res.sendStatus(401); } });
42. [Summary]: ticks total nonlib name 79 0.2% 0.2% JavaScript 36703 97.2% 99.2% C++ 7 0.0% 0.0% GC 767 2.0% Shared libraries 215 0.6% Unaccounted
43. [C++]: ticks total nonlib name 19557 51.8% 52.9% node::crypto::PBKDF2(v8) 4510 11.9% 12.2% _sha1_block_data_order 3165 8.4% 8.6% _malloc_zone_malloc
45. $ npm install -g 0x $ 0x app.js
47. disk
48. memory
49. real-time monitoring
50. load, profile, fix, repeat!
51. thank you @_abhinavrastogi http://tiny.cc/scalingnodejs