bug#46881: 28.0.50; pdumper dumping causes way too many syscalls

[Eli Zaretskii]

> From: Daniel Colascione <dancol@dancol.org>
> CC: <mattiase@acm.org>, <pipcet@gmail.com>, <46881@debbugs.gnu.org>, 
> <eggert@cs.ucla.edu>
> Date: Tue, 15 Jun 2021 06:25:50 -0700
> 
> >> That's what I preferred (still do), but Lars thought that the slightly
> >> faster version without stdio was preferable.
> >
> > Well, it's 30% faster in a single-threaded phase of the compilation, so
> > it seems like a significant improvement to me.
> >
> > --
> > (domestic pets only, the antidote for overdose, milk.)
> >   bloggy blog: http://lars.ingebrigtsen.n
> 
> The in-memory version is 30% faster than the FILE* version or 30% faster 
> than the current write () version?

The former, see

  https://debbugs.gnu.org/cgi/bugreport.cgi?bug=46881#56