Scheduler benchmarks

[Mulyadi Santosa]

On Tue, Aug 18, 2020 at 9:32 PM Muni Sekhar <munisekharrms at gmail.com> wrote:

> Hi all,
>
> I’ve two identical Linux systems with only kernel differences.
> While doing kernel profiling with perf, I got the below mentioned
> metrics for Scheduler benchmarks.
>
> 1st system (older kernel version compared to the other system) benchmark
> result:
>
> $ perf bench sched messaging -g 64
> # Running 'sched/messaging' benchmark:
> # 20 sender and receiver processes per group
> # 64 groups == 2560 processes run
>
>      Total time: 2.936 [sec]
>
>
> 2nd system benchmark result:
>
> $ perf bench sched messaging -g 64
> # Running 'sched/messaging' benchmark:
> # 20 sender and receiver processes per group
> # 64 groups == 2560 processes run
>
>      Total time: 10.074 [sec]
>
>
> So as per scheduler benchmark results, clearly a huge difference
> between two systems.
> Can anyone suggest to me how to dive deeper to know the root cause for
> it. Also are there any tunable kernel parameters related to this one?
>
>
>
> --
> Thanks,
> Sekhar
>
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Aside from very far different kernel version, I think you need to use perf
record and visualized it with heat map too (check Brendan Gregg blog)

On the lower level side, check cache miss on L1/L2/L3 rate on both
configuration. That might reveal something

-- 
regards,

Mulyadi Santosa
Freelance Linux trainer and consultant

blog: the-hydra.blogspot.com
training: mulyaditraining.blogspot.com

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