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How to make Perfume dance
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nari
November 10, 2013
Technology
2
4.5k
How to make Perfume dance
Let's dance!
nari
November 10, 2013
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Transcript
#rubyconf 13 nari/@nari3/authorNari Network Applied Communication Laboratory How to make
Perfume dance
Self-introduction ➔ nari, @nari3, authorNari ➔ A CRuby committer ➔
I'm a creator of Bitmap Marking GC in Ruby 2.0
Perfume
http://perfume-dev.github.io/
This motion data is free to use
There are many works on the official site
I wanted to make Perfume dance with Ruby!!
Hacking plan ➔ Use Ruby/SDL. ➔ Motion data format is
BVH – We can parse it with bvh gem :) ➔ Done!
First prototype http://youtu.be/rjoFPGmJyn0
Yes! There is a bug! ➔ I fixed wrong matrix
calculation ➔ Done!
Second prototype http://youtu.be/f9j4Qh5A3ys
But there is a unfavorable line of code
GC.disable
Why?
The motion data is big (2.0MB) -------- -------- -------- *.bvh
parse Create many read only objects
GC must scans these object each time GC ✔ ✔
✔ ✔ ✔ ✔ ✔ Stop The World Stop time is long
DEMO
In Ruby 2.1, ➔ Introduced Generational GC a.k.a RGenGC by
ko1-san ➔ This feature saves Perfume's dance.
GC scans these object sometimes GC ✔ ✔ ✔ ✔
✔ ✔ Don't stop Stop time is short ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ Next GC Ignored
DEMO
Conclusion ➔ RGenGC is cool. ➔ ko1-san is also cool.
➔ Ruby 2.1 will be great! – You should not use GC.disable
Thank you!