Re: Scheduler fairness problem on 2.6 series

[Prakash K. Cheemplavam]

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| I don't think it is the overhead. I rather think the way the kernel
| schedulers gives mpich and the cpu bound program  resources is unfair.

Well, I don't know whether it helps, but I ran a profiler and these are
the functions which cause so much wasted CPU cycles when running 16
processes of my example with mpich:

124910    9.8170  vmlinux                  tcp_poll
123356    9.6949  vmlinux                  sys_select
85634     6.7302  vmlinux                  do_select
71858     5.6475  vmlinux                  sysenter_past_esp
62093     4.8801  vmlinux                  kfree
51658     4.0600  vmlinux                  __copy_to_user_ll
37495     2.9468  vmlinux                  max_select_fd
36949     2.9039  vmlinux                  __kmalloc
22700     1.7841  vmlinux                  __copy_from_user_ll
14587     1.1464  vmlinux                  do_gettimeofday

Is anything scheduler related?

bye,

Prakash
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