Sarath Kamisetty wrote:
Hi,
How does Linux handle this ? Any idea ?
If you make 1000 threads, you get 1000 slots on the scheduler. (last time I looked..
Let me know if I'm wrong).
The guy next to you with 'vi' gets 1 slot.. who gets more cpu?
Thanks, Sarat
On Mon, 28 Feb 2005 00:26:10 -0800, Julian Elischer <[EMAIL PROTECTED]> wrote:
Ashwin Chandra wrote:
I wanted to get some clarification about the 4BSD scheduler. I am sort of
confused why there are two forms of scheduling, one done between processes and
another done between threads in a process. The priority calculations seem to be
done only with processes and I assume that the global run queue holds processes,
not threads. Also why is there only 1 run queue for 1 CPU. What happens to
blocked processes and ready to be runned processes?
Part of the challenge of adding threads to a system is to make it hard for a threaded process to "flood" the system run queues so that other processes get no cpu time.
The scheme in the current freeBSD schedulers is a "crude" method, by which only a limitted number of threads per process are allowed to be added to the system run queue. RUnnable hreads fo r aprocess are kept on a run queue for the process and only the highest N prioriy hreads are actually put on the system run queue.
This is by no means the best way, but rather the easiest way. I am hoping that some PhD candidate somewhere will decide that thread scheduling is his topic and will figure out a better way of doing this.
both run queues hold threads. This is still a place wjere a lot of work can be done.
:-)
Ash
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