On Sat, Apr 6, 2019, 4:44 PM Stefan Monnier <monn...@iro.umontreal.ca>
wrote:
>
> > 2. A lot of my editing involves editing near (but not at) the end of
> > a file. I assume (I know) that the software that saves the file is
> > smart enough not to rewrite the entire file but instead to preserve
> > the beginning of the file and just rewrite the changed part of the
> > file (or from there to the end of the file).
>
> Not completely sure if "you assume" or "you know" it to be the case.
> Especially given that you then add:
>
> > Can anyone confirm that,
>
> which suggest you're not really sure (unless it referred to something
> else).
>
Let's say you are using vi. Last I heard, it will buffer the entire file
contents on the initial open (unless you use the right option etc). How
about on file write?
I don't know.
I submit that rather than try to figure out each app, just install sar and
related utilities and view the aggregate throughput. Maybe use cacti for
quicker-to-screen graphics if you want.
Stefan
>
>
