lightning talk at nosqleu 2010 (london) http://nosqleurope.com/

1. memory
as the
new disk

2. ☞redis
tim lossen
@nosqleu

3. “memory is
the new disk,
disk is the
new tape”
— jim gray

4. strengths
harddisk
- durability
- capacity
- sequential access (= “tape”)
memory
- random access
- low latency

5. relative latency
register 0.1
cache 1
memory 10
harddisk 1.000.000
“latency trumps all” — chris saari

6. relative latency
register 0.1
cache 1
memory 10
harddisk 1.000.000
“latency trumps all” — chris saari

7. flickr.com/photos/36688133@N00/3655892919

8. berlin - london
easyjet 1 hour

9. berlin - london
f-16 6 minutes
easyjet 1 hour

10. berlin - london
f-16 6 minutes
easyjet 1 hour
eurostar 10 hours

11. berlin - london
f-16 6 minutes
easyjet 1 hour
eurostar 10 hours
broken car 114 years

12. flickr.com/photos/64498037@N00/3107322938

13. flickr.com/photos/64498037@N00/3107322938

14. redis
flickr.com/photos/atzu/2645776918

15. benchmark
4897 GET/s
5128 SET/s
code.google.com/p/redis/wiki/Benchmarks

16. flickr.com/photos/mbiddulph/3836727468

17. sheeva plug
flickr.com/photos/mbiddulph/3836727468

18. sheeva plug
$99flickr.com/photos/mbiddulph/3836727468

19. features
data structures
- integers, strings
- lists, sets, hashes
- channels
atomic operations
- get, set, increment
- push, pop ...

20. features
virtual memory
- keys always in memory
- values swapped in as needed
durability
- append-only log file
- background snapshots
replication

21. implementation
- 10k lines of pure ansi c poetry
- no erlang, no javascript, no xml,
no map-reduce, no hash rings, no
merkle trees, no paxos, no vector
clocks, no gossip protocol, no
auto scaling, no friggin magic

23. clients
- redis-cli, telnet
- c, c#
- ruby, python, perl
- java, scala
- php
- [many more ...]

24. summary
- don’t cross the red line
- avoid magic
- redis is simple & very flexible

25. summary
- don’t cross the red line
- avoid magic
- redis is simple & very flexible
- ..... and pretty fast as well☺

26. q&a

27. thanx!
❦
@tlossen

28. links
slideshare.net/guest22d4179/
latency-trumps-all
code.google.com/p/redis
github.com/antirez/redis
rediscookbook.org

29. one-minute install
> wget redis.tgz
> tar xzf redis.tgz
> cd redis
> make
> ./redis-server