Re: Why M:N threading with scheduler activations?

Riso Liao wrote:
> I`ve read this:
> http://marc.theaimsgroup.com/?l=linux-kernel&m=103284879216107&w=2
> It seems that 1:1 Threading is better than M:N threading with scheduler
> activations.
> I can`t find a NGPT Whitepaper.
> Can someone tell me why NGPT is M:N threading with scheduler activations?

I'm no NGPT expert, but:
1. NGPT doesn't use scheduler activations (yet) as far as I know.
2. NGPT is M:N threading because it seemed like a good idea at the time,
so they started with Gnu Pth, which was an all-user-space threading
library,
and added kernel thread support to it (I think).

There are a lot of people who still believe M:N threading is a good
idea.
It will be interesting to see whether NGPT or NPTL is better once the
dust settles.

See http://www.kegel.com/c10k.html#threaded for my collection of info
on the question.
- Dan