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...er node, the performance data were: # of Ticket Fair Unfair nodes lock queue lock queue lock ------ ------- ---------- ---------- 1 135 135 137 2 4452 1736 1178 3 10767 13432 1933 4 20835 10796 2596 Of course there are pretty big variation in the execution times of each individual task. For the 4 nodes case above, the standard deviation was 209ms. In general, the shorter the critical section, the better the performance benefit of an unfair lock. For large critical sec...

I have a 2 node cluster of HP DL380G4s. These machines are attached via scsi to an external HP disk enclosure. They run 32bit RH AS 4.0 and OCFS 1.2.4, the latest release. They were upgraded from 1.2.3 only a few days after 1.2.4 was released. I had reported on the mailing list that my developers were happy, and things seemed faster. However, twice in that time, the cluster has gone down due

...fic at low contention level. The table below show the performance with 1 contending task per node: [Standalone] # of nodes Ticket lock Queue lock %Change ---------- ----------- ---------- ------- 1 135 135 0% 2 4452 1736 -61% 3 10767 13432 +25% 4 20835 10796 -48% Except some drop in performance at the 3 contending tasks level, the queue spinlock performs much better than the ticket spinlock at 2 and 4 contending tasks level. Signed-off-by: Waiman Long <Waiman.Long at hp.com> --- arch/x86/include/asm/qspinlock.h | 3 +- kernel/lockin...

...raffic at low contention level. The table below show the performance with 1 contending task per node: [Standalone] # of nodes Ticket lock Queue lock %Change ---------- ----------- ---------- ------- 1 135 135 0% 2 4452 528 -88% 3 10767 2369 -78% 4 20835 2921 -86% The micro-benchmark was also run on a 4-core Ivy-Bridge PC. The table below shows the collected performance data: [Standalone/Embedded] # of tasks Ticket lock Queue lock %Change ---------- ----------- ---------- ------- 1 197/178 181/150 -8%/-16% 2 1109/928...

...raffic at low contention level. The table below show the performance with 1 contending task per node: [Standalone] # of nodes Ticket lock Queue lock %Change ---------- ----------- ---------- ------- 1 135 135 0% 2 4452 528 -88% 3 10767 2369 -78% 4 20835 2921 -86% The micro-benchmark was also run on a 4-core Ivy-Bridge PC. The table below shows the collected performance data: [Standalone/Embedded] # of tasks Ticket lock Queue lock %Change ---------- ----------- ---------- ------- 1 197/178 181/150 -8%/-16% 2 1109/928...

v7->v8: - Remove one unneeded atomic operation from the slowpath, thus improving performance. - Simplify some of the codes and add more comments. - Test for X86_FEATURE_HYPERVISOR CPU feature bit to enable/disable unfair lock. - Reduce unfair lock slowpath lock stealing frequency depending on its distance from the queue head. - Add performance data for IvyBridge-EX CPU.

v7->v8: - Remove one unneeded atomic operation from the slowpath, thus improving performance. - Simplify some of the codes and add more comments. - Test for X86_FEATURE_HYPERVISOR CPU feature bit to enable/disable unfair lock. - Reduce unfair lock slowpath lock stealing frequency depending on its distance from the queue head. - Add performance data for IvyBridge-EX CPU.

N.B. Sorry for the duplicate. This patch series were resent as the original one was rejected by the vger.kernel.org list server due to long header. There is no change in content. v7->v8: - Remove one unneeded atomic operation from the slowpath, thus improving performance. - Simplify some of the codes and add more comments. - Test for X86_FEATURE_HYPERVISOR CPU feature bit

N.B. Sorry for the duplicate. This patch series were resent as the original one was rejected by the vger.kernel.org list server due to long header. There is no change in content. v7->v8: - Remove one unneeded atomic operation from the slowpath, thus improving performance. - Simplify some of the codes and add more comments. - Test for X86_FEATURE_HYPERVISOR CPU feature bit

v5->v6: - Change the optimized 2-task contending code to make it fairer at the expense of a bit of performance. - Add a patch to support unfair queue spinlock for Xen. - Modify the PV qspinlock code to follow what was done in the PV ticketlock. - Add performance data for the unfair lock as well as the PV support code. v4->v5: - Move the optimized 2-task contending code to the

v5->v6: - Change the optimized 2-task contending code to make it fairer at the expense of a bit of performance. - Add a patch to support unfair queue spinlock for Xen. - Modify the PV qspinlock code to follow what was done in the PV ticketlock. - Add performance data for the unfair lock as well as the PV support code. v4->v5: - Move the optimized 2-task contending code to the

v6->v7: - Remove an atomic operation from the 2-task contending code - Shorten the names of some macros - Make the queue waiter to attempt to steal lock when unfair lock is enabled. - Remove lock holder kick from the PV code and fix a race condition - Run the unfair lock & PV code on overcommitted KVM guests to collect performance data. v5->v6: - Change the optimized

v6->v7: - Remove an atomic operation from the 2-task contending code - Shorten the names of some macros - Make the queue waiter to attempt to steal lock when unfair lock is enabled. - Remove lock holder kick from the PV code and fix a race condition - Run the unfair lock & PV code on overcommitted KVM guests to collect performance data. v5->v6: - Change the optimized

v4->v5: - Move the optimized 2-task contending code to the generic file to enable more architectures to use it without code duplication. - Address some of the style-related comments by PeterZ. - Allow the use of unfair queue spinlock in a real para-virtualized execution environment. - Add para-virtualization support to the qspinlock code by ensuring that the lock holder and queue

v4->v5: - Move the optimized 2-task contending code to the generic file to enable more architectures to use it without code duplication. - Address some of the style-related comments by PeterZ. - Allow the use of unfair queue spinlock in a real para-virtualized execution environment. - Add para-virtualization support to the qspinlock code by ensuring that the lock holder and queue

Hi Stepan, Sorry for the delay. It's great that you are working on MergeFunctions as well and I agree, we should definitely try to combine our efforts to improve MergeFunctions. Just to give you some context, the pass (with the similar function merging patch) is already being used in a production setting. From my point of view, it would be better if we focus on improving its capability

...0.02 154934 0 0.02 154934 op_tab.ll 1 21908 0 0.01 21878 0 0.01 21878 option.ll 1 2602 0 0.01 2579 0 0.01 2579 options.ll 20 132186 0 0.02 132168 * * * order.ll 34 90612 2 0.01 90188 0 0.02 90595 Oscar.ll 10 39764 0 0.01 39745 0 0.01 39745 outbig.ll 1 39877 0 0.01 39844 0 0.01 39844 OutBuffer.ll 8 20835 0 0.01 20803 0 0.01 20803 outgeo.ll 1 47164 0 0.01 47131 0 0.01 47131 OutMemStream.ll 14 48489 0 0.01 48457 0 0.01 48457 outpin.ll 1 28776 0 0.01 28743 0 0.01 28743 output.ll 28 165079 0 0.02 165053 0 0.02 164667 outputMetricsData.ll 1 12715 0 0.01 12690 0 0.01 12690 outputQuery.ll 3 11755 0 0.01 1...

v4->v5: - Move the optimized 2-task contending code to the generic file to enable more architectures to use it without code duplication. - Address some of the style-related comments by PeterZ. - Allow the use of unfair queue spinlock in a real para-virtualized execution environment. - Add para-virtualization support to the qspinlock code by ensuring that the lock holder and queue

v4->v5: - Move the optimized 2-task contending code to the generic file to enable more architectures to use it without code duplication. - Address some of the style-related comments by PeterZ. - Allow the use of unfair queue spinlock in a real para-virtualized execution environment. - Add para-virtualization support to the qspinlock code by ensuring that the lock holder and queue