Re: [PATCH] Fix #27777 - now use a doubly-linked list for _IO_list_all

["H.J. Lu" <hjl.tools@gmail.com>]

On Tue, Apr 30, 2024 at 12:52 PM <alexandre.ferrieux@orange.com> wrote:
>
>
>
> On 30/04/2024 20:11, H.J. Lu wrote:
> >>  > As tst-fclose.c shows, after opening 2 million (FILE*), the fclose() of
> >>  > 100 of them takes more than a few seconds without the patch, and under
> >>  > 2 seconds with it.
> >>
> >> Don't you mean "under 2 milliseconds" ? That's closer to what I see here.
> >
> > The timeout value in tst-fclose.c is in seconds.  I verified that if
> > the doubly-linked list wasn't used, tst-fclose failed with timeout.
>
> Ah, OK, you mean 2s is the threshold used in the automated test, makes sense.
> But to illustrate/explain, it is worth mentioning it actually drops to milliseconds.

It depends on if the wall clock is used.   On a heavily loaded machine, it
can take much more than a few milliseconds.

-- 
H.J.