Why all cpu work together

[yushanyong]

Dear All： I encountered a problem, I don’t know if it can be avoided. E.g: NnetLatticeFasterOnlineRecognizer.decode(), I use it to decode a wav file, and when I call it once, I find that all the cpu will work together, and through htop tracking process I found yield. So I guess there is coroutine mechanism inside?

I want to limit the task to one cpu, How can i do it?
Looking forward to your reply。
Thank you！