On Wed, Aug 26, 2020 at 12:44:37AM +0800, Luck, Tony wrote: > > These 2 variables are accessed in 2 hot call stacks (for this 288 CPU > > Xeon Phi platform): > > This might be the key element of "weirdness" for this system. It > has 288 CPUs ... cache alignment problems are often not too bad > on "small" systems. The as you scale up to bigger machines you > suddenly hit some critical point and performance drops dramatically. > > It's good that you are picking up tips on how to bisect these and diagnose > the underlying problem. Number of cores is going to keep increasing, so > we will keep finding new issues like this.
Yes, now we have one more bullet for shooting this kind of strange performance changes :) Thanks, Feng > -Tony
