On Fri, 03 Feb 2017 13:42:46 -0500, Waiman Long said:
> This patch set does guarantee some minimum performance level, but it
> can't guarantee fairness for all the lock waiters.
OK, sounds like it's a situation that's statistically unlikely, but it has
protections against starvation so the system
On 02/03/2017 01:23 PM, valdis.kletni...@vt.edu wrote:
> On Fri, 03 Feb 2017 13:03:50 -0500, Waiman Long said:
>
>> On a 2-socket 36-core E5-2699 v3 system (HT off) running on a 4.10
>> WW futex TP futex Glibc
>> -
On Fri, 03 Feb 2017 13:03:50 -0500, Waiman Long said:
> On a 2-socket 36-core E5-2699 v3 system (HT off) running on a 4.10
> WW futex TP futex Glibc
> -
> Total locking ops35,707,234
All the TP futex lock waiters are serialized in the kernel using a
kernel mutex which acts like a wait queue. The order at which the
waiters popped out from the wait queue will affect performance when
exclusive (writer) and shared (reader) lock waiters are mixed in the
queue. The worst case scenari
