How to make Perfume dance

Let's dance!

1. #rubyconf 13 nari/@nari3/authorNari Network Applied Communication Laboratory How to make Perfume dance
2. Self-introduction ➔ nari, @nari3, authorNari ➔ A CRuby committer ➔ I'm a creator of Bitmap Marking GC in Ruby 2.0
3. Perfume
4. http://perfume-dev.github.io/
5. This motion data is free to use
6. There are many works on the official site
7. I wanted to make Perfume dance with Ruby!!
8. Hacking plan ➔ Use Ruby/SDL. ➔ Motion data format is BVH – We can parse it with bvh gem :) ➔ Done!
9. First prototype http://youtu.be/rjoFPGmJyn0
10. Yes! There is a bug! ➔ I fixed wrong matrix calculation ➔ Done!
11. Second prototype http://youtu.be/f9j4Qh5A3ys
12. But there is a unfavorable line of code
13. GC.disable
14. Why?
15. The motion data is big (2.0MB) -------- -------- -------- *.bvh parse Create many read only objects
16. GC must scans these object each time GC ✔ ✔ ✔ ✔ ✔ ✔ ✔ Stop The World Stop time is long
17. DEMO
18. In Ruby 2.1, ➔ Introduced Generational GC a.k.a RGenGC by ko1-san ➔ This feature saves Perfume's dance.
19. GC scans these object sometimes GC ✔ ✔ ✔ ✔ ✔ ✔ Don't stop Stop time is short ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ Next GC Ignored
20. DEMO
21. Conclusion ➔ RGenGC is cool. ➔ ko1-san is also cool. ➔ Ruby 2.1 will be great! – You should not use GC.disable
22. Thank you!