How to make Perfume dance

Transcript

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!