Re: Source of the spin

On 2021-06-29, Sven F. <sven.falempin@gmail.com> wrote:
> Dear readers,
>
> I probably did something silly again,
> Could you help with a bit of knowledge around performance ?
> My openbsd CPU (6.8) is spinning a lot :
>
> 0.0%Int 53.1%Spn 25.8%Sys 19.6%Usr 1.4%Idle
>
> * Is this bad ?
> * What kind of basic operation ( like basic shell scripting ) could do that ? ?
>
> Thank you,
>

This means the kernel is spending a lot of time waiting for other CPUs
to exit locked sections.

First things first, try 6.9, the malloc cache implementation changed
and that may help.