Hi!
> >The SGI Altix can have 2048 CPUs.
>
> And does it run one image of Linux? Or more images each
> on few cpus?
>
> How do they solve problem with spinlock livelocks?
>
> If time-spent-outside-spinlock/time-spent-in-spinlock <
> number-of-cpus, the spinlock livelock may happen ---
> this condition is not true normally with 2 or 4 cpus,
> but for that high amount of cpus, there is a danger.
Lets say time-spent-outside-spinlock == time-spent-in-spinlock and
number-of-cpus == 2.
1 < 2 , so it should livelock according to you...
...but afaict this should work okay. Even if spinlocks are very
unfair, as long as time-outside and time-inside comes in big chunks,
it should work.
If you are unlucky, one cpu may stall for a while, but... I see no
livelock.
--
Thanks for all the (sleeping) penguins.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
