bug#895: slow processing of process output

[Alexis]

Eli Zaretskii <eliz@gnu.org> writes:

> I think we need to try reproducing this on a Posix host before 
> we can conclude the bug is fixed.  The original problem was 
> reported on GNU/Linux, AFAICT, and the machinery used on Windows 
> for communicating with subprocesses is very different from that 
> used on Unix.
>
> Would someone please try reproducing this on GNU or Unix system?

Compiled from current master, running the rgrep command as per the 
OP successfully returns a buffer of ~17000 lines almost instantly 
on my Debian Jessie system.