Messages in this thread | | | Date | Tue, 8 Jul 2014 01:04:59 +0200 | From | Andi Kleen <> | Subject | Re: fallout of 16K stacks |
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On Mon, Jul 07, 2014 at 03:49:48PM -0700, H. Peter Anvin wrote: > On 07/07/2014 03:30 PM, Andi Kleen wrote: > > > > Since the 16K stack change I noticed a number of problems with > > my usual stress tests. They have a tendency to bomb out > > because something cannot fork. > > As in ENOMEM or does something worse happen?
EAGAIN, then the workload stops. For an overnight stress test that's pretty catastrophic. It may have killed some stuff with the OOM killer too.
> > - AIM7 on a dual socket socket system now cannot reliably run > >> 1000 parallel jobs. > > ... with how much RAM?
This system has 32G
> > - LTP stress + memhog stress in parallel to something else > > usually doesn't survive the night. > > > > Do we need to strengthen the memory allocator to try > > harder for 16K? > > Can we even? The probability of success goes down exponentially in the > order requested. Movable pages can help, of course, but still, there is > a very real cost to this :(
I hope so. In the worst case just try longer.
-Andi
-- ak@linux.intel.com -- Speaking for myself only.
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