less Idle time with busybox ash as bash vs bash

[Denys Vlasenko]

In Fri, Aug 31, 2018 at 8:11 PM James Hanley <jhanley at dgtlrift.com> wrote:
> We had some bash scripts that we converted to use busybox ash as bash
> (removed any array constructs) and when comparing the two scripts - it
> seems that running them under busybox yields less idle time compared
> to bash.
>
> I was expecting that busybox would (itself) take up more time simply
> because of vfork, but yield more CPU time overall since there would be
> less overhead as a number of the applets would not fork&exec.
>
> Is this expected behavior that busybox overall yields less idle time?

Possibly. You need to give more details, or diagnose it yourself
(find where exactly it happens).