Threading arch quetions
katsuo_harada_evil_does at hotmail.com
Tue Dec 5 03:29:18 PST 2006
>From: Julian Elischer <julian at elischer.org>
>To: Joshua M <katsuo_harada_evil_does at hotmail.com>
>CC: freebsd-threads at freebsd.org
>Subject: Re: Threading arch quetions
>Date: Mon, 04 Dec 2006 13:57:17 -0800
>We adopted a scheme which would allow us to implement both M:N threads
>and 1:1 threads with compatible libraries that do it each way.
>The hope was that this would allow people to experiment with these.
>and for us to be able to select the best approach.
Thank you for your response.
Can you please name those libs ?
>There are examples where M:N outperforms 1:1 but they are the
>minority, so we will be switching the default library to
What is the default library ?
>Note that the kernel support for threads is the same for both models,
>where processes have sub-entities (kernel schedulable entities) called
>threads, as opposed to in Linux where each thread is a separate process.
This is the point i dont understand at all. As i understood KSE is an N to M
approach and it is implemented in FBSD. So how 1:1 is supposed to coexist if
finally everythig is converted to N to M ? does it mean that basically FBSD
if it wants 1 to 1 always creates 1 KSEG per thread and thus create a
*simulation* of 1 to 1 approach ?
Thank you again.
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