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 -- [email protected] -- Speaking for myself only. -- 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/
