The document discusses ways to make Ruby CGI scripts faster. It explains that process invocation and library loading are the main reasons CGI scripts are slow. Various case studies are presented on optimizing code by lazy-loading libraries, avoiding unnecessary objects, and parsing query strings efficiently. Benchmark results show performance improvements from these techniques.

1. Nagoya RubyKaigi 02
How to Make
Ruby CGI Script Faster
CGI
makoto kuwata
http://www.kuwata-lab.com/

2. What I'll talk and not
I talk about I don't talk about
Why CGI is so slow? Scale out
How to improve your Database
code?
Key Value Store
Or other kool topics

3. Why CGI Script
is So Slow?

4. Example Code
}
}
}

5. Benchmark
Process Invocation require 'cgi'
cgi = CGI.new render HTML
1.80%
0.87%
39.55%
57.78%
Mac OS X 10.6
Ruby 1.8.7-p334
Core2 Duo 2GHz
https://gist.github.com/850390

6. Why CGI is so slow?
FACT
Process invocation is slow
TRUTH
Library loading is much slow

7. Benchmark of 'require'
(none) 6.15 1.8.7-p334
erb 9.26
time 15.9 Library loading
uri 16.15 is much slower
fileutils 17.26 than process
cgi 17.31 invocation
tmpdir 17.84
(
pstore 19.19
date2 19.4 )
openssl 21.92
tempfile 22.53
cgi/session 30.18
yaml 32.27
rexml/document 40.96
0 10 20 30 40 50 (ms)
https://gist.github.com/850386

8. Benchmark of 'require'
(none) 13.35 1.9.2-p180
erb 21.58
time 30.88
uri 43.42
fileutils 37.52
cgi 25.82
tmpdir 39.07
pstore 48.8
date2 0
openssl 36.16
tempfile 53.82
cgi/session 57.38
yaml 81.61
rexml/document 109.42
0 20 40 60 80 100 120 (ms)
https://gist.github.com/850386

9. Benchmark of 'require'
(none) 1.8.7-p334
erb 1.9.2-p180
time
uri 1.9 is slower than
fileutils 1.8 for process
cgi invocation and
tmpdir library loading
pstore (1.9
date2
openssl 1.8 )
tempfile
cgi/session
yaml
rexml/document
0 20 40 60 80 100 120 (ms)

10. Case Study: tmpdir
tmpdir.rb requires fileutils.rb
tmpdir.rb fileutils.rb require

11. Case Study: tmpdir
Change to require only when necessary
require

12. Benchmark
before after
17.84
tmpdir.rb
6.99
0 5 10 15 20 (ms)

13. Case Study: delegate
DelegateClass makes library loading slow
DelegateClass

14. Benchmark
Using DelegateClass
Without DelegateClass
17.31
cgi.rb
14.17
22.53
tempfile.rb
19.29
0 5 10 15 20 25 (ms)

15. Case Study: openssl
Openssl pollutes other libraries
openssl require

16. Case Study: openssl
Calculate session id without
securerandom.rb
securerandom.rb ID

17. How to Improve
Your Code?

18. How to improve?

19. Answer

20. Benchmark
h() is much slower than
h(s1) escape_html() when there
escape_html(s1) are '&<>"' characters
( &<>" escape_html()
h(s2) h() )
escape_html(s2)
h(s3)
escape_html(s3)
0 12.5 25 37.5 50
s1 : 0 html characters Ruby 1.8.7-p334
s2 : 5 html characters
s3 : 15 html characters https://gist.github.com/850396

21. How to improve?

22. Answer

23. Answer
Ignore '+' :)

24. Benchmark
Ruby 1.8.7-p334
parse1()
parse2()
parse3()
0 2 4 6 8
Ruby 1.9.2-p180
parse1()
parse2()
parse3()
0 2 4 6 8
https://gist.github.com/850402

25. How to improve?

26. Answer

27. Example Code

28. Benchmark
Ruby 1.8.7-p334
parse_nested_query()
parse_dotted_query()
0 3.5 7 10.5 14
Ruby 1.9.2-p180
parse_nested_query()
parse_dotted_query()
0 3.5 7 10.5 14
https://gist.github.com/850407

29. How to improve?
renaming is faster
than read&write
(
rename
)

30. Answer Moving file on other
partition is too expensive
(
)

31. Answer
Set $TMPDIR before loading cgi.rb
(require 'cgi'
)

32. How to improve?
C/Java style coding is slow in Ruby
(C Java ,
Ruby )

33. Answer

34. Conslusion

35. Ruby
There are a lot of code which is not so
efficent
( )
If your code is slow, it is due to yourself,
not to Ruby.
(
Ruby )

36. one more thing...

37. Benchmarker
Benchmarker
Benchmark utility
Repeat benchmarks, average results, ...

38. CGIAlt, CGIExt
CGIAlt
Fast and cgi.rb compatible
http://cgialt.rubyforge.org/
CGIExt
Implemented in C
http://cgiext.rubyforge.org/

39. thank you