On 6/17/07, Muhammad Tayseer Alquoatli <idoit.ief@xxxxxxxxx> wrote:
Linux will not set the smp affinity of all non-critical process. Its just balances the queue and If flow of non-critical tasks increases it may pull some non-crit tasks to first 3 processors. It would be safe to set the smp_affinity manually.
You can use cpuset for that. please refer Documentation/cpuset.txt
Hi all:
Lets say i have an SMP machine with 4 processor running Linux 2.6, and
i have 6 instances of an RT critical processes
If I set the smp process affinity of those 6 processes to the first 3
processors (two for each processor), run them as an RT processes with
FIFO sched policy, and left the forth processor to handle other
non-critical tasks
in short if i do:
#taskset 0x01 chrt -f 50 critical_program &
#taskset 0x01 chrt -f 50 critical_program &
#taskset 0x02 chrt -f 50 critical_program &
#taskset 0x02 chrt -f 50 critical_program &
#taskset 0x04 chrt -f 50 critical_program &
#taskset 0x04 chrt -f 50 critical_program &
As i've read that Linux will balance the length of run queue of all
processors, but here i have three processors that are not going to
handle any process
the question is: do i have to manually set the smp affinity of all
other non-critical tasks to the forth processor or Linux will do this
automatically ?
Linux will not set the smp affinity of all non-critical process. Its just balances the queue and If flow of non-critical tasks increases it may pull some non-crit tasks to first 3 processors. It would be safe to set the smp_affinity manually.
You can use cpuset for that. please refer Documentation/cpuset.txt
Thanks
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Muhammad Tayseer Alquoatli
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Thanks
Srinivas DS
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