> On Mon, 13 Aug 2018 at 17:36, Alexander Korotkov <a.korot...@postgrespro.ru> > wrote: > > Hi! > > I run pgbench (read-write and read-only benchmarks) on Amazon > c5d.18xlarge virtual machine, which has 72 VCPU (approximately same > power as 36 physical cores). The results are attached > (lwlock-fair-ro.png and lwlock-fair-rw.png).
Hi, Thanks for working on that. I haven't read the patch yet, but I think it worth mentioning that with testing locks on AWS we also need to take into account lock holder/waiter preemtion problem and such things as Intel PLE, since I believe they can have significant impact in this case. Right now I'm doing some small research on this topic and I hope soon I'll finish a tool and benchmark setup to test the influence of such factors in virtualized environment. In the meantime I would be glad to review your patches.
