This document discusses using Erlang as a web framework. Erlang provides concurrency, distribution, and fault tolerance which make it suitable for building web applications and APIs. It can handle high loads, with examples showing it serving over 700 requests per second and 150 concurrent users with average response times under 1 second. The document demonstrates building a basic database-driven website in Erlang and provides references for further learning about the language and web development using Erlang frameworks.

1. Erlang Web Framework
Cuong Thai
www.htk-inc.com
bronzeboyvn@gmail.com

2. Content
1. Why Erlang?
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concurrency
distributed
fault-tolerance
2. Are you kidding me?
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10 times faster than PHP
c10k, 1000msg/sec, 24hours, 78Mb
3. Database-driven website.

3. Concurrency
Concurrency for our
web applications and
API backends means
that we'd like our
htop look like this

4. Concurrency
Erlang is easy capable of spawning hundreds of
thousands of processes on a single system running
on commodity hard-ware.

5. Distributed
You can have a number of machines across
net-work happily chatting with another.
Bill
Rick
Zoey
Daryl

6. Distributed
Process communication by copying
Location transparency (clustering)
Bill
Rick
Zoey
Daryl

7. Fault-tolerance

8. Fault-tolerance

9. Fault-tolerance

10. Fault-tolerance

11. Fault-tolerance

12. Are you kidding me?
“With PHP
framework you
typically see page
generation times
between 150 and
600 milliseconds.
Zotonic has a typical
page generation time
of 10 milliseconds or
less.”
How about you,
Chicago Boss?

13. siege -c15 http://localhost:8001/admin -b -t30s
** SIEGE 2.72
** Preparing 15 concurrent users for battle.
The server is now under siege...
Lifting the server siege...
Transactions:
Availability:
done.
21144 hits
100.00 %
Elapsed time:
29.12 secs
Data transferred:
116.59 MB
Response time:
0.02 secs
Transaction rate:
726.10 trans/sec
Throughput:
4.00 MB/sec
Concurrency:
14.98
Successful transactions:
21144
Failed transactions:
0
Longest transaction:
0.05
Shortest transaction:
0.00

14. siege -c150 http://localhost:8001/admin -b -t30s
** SIEGE 2.72
** Preparing 150 concurrent users for battle.
The server is now under siege...
Lifting the server siege...
Transactions:
Availability:
done.
20247 hits
100.00 %
Elapsed time:
29.32 secs
Data transferred:
111.64 MB
Response time:
0.22 secs
Transaction rate:
690.55 trans/sec
Throughput:
3.81 MB/sec
Concurrency:
149.36
Successful transactions:
20247
Failed transactions:
0
Longest transaction:
0.46
Shortest transaction:
0.01

15. Are you kidding me?
metabrew.com
Richard Jones co-founded and was CTO of last.fm for 6 years

16. Database-driven website
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Hello World page
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Hello World JSON
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Hello World template
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BossMQ

17. Q&A

18. Thank you for your attention!
Ref.
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learnyousomeerlang.com
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Erlang and OTP in action (Martin Logan, Eric Merritt, Richard Carlsson)
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metabrew.com
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infrequently.org/2006/03/comet-low-latency-data-for-the-browser/
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zotonic.com/features
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github.com/evanmiller/ChicagoBoss/wiki/An-Evening-With-Chicago-Boss