Emacs seems to be dragging down other processes?

[Ken Brown]

On 3/7/2019 3:39 PM, David Karr wrote:
> I've recently been having general performance problems on my Win7 laptop,
> mostly realized by very slow switches to workspaces (Dexpot).  I've been
> watching processes using high cpu, and I'm trying to watch for processes
> with high i/o, but I'm not as certain how to find those (I'm using Process
> Explorer).  I finally discovered that when I kill my Cygwin Emacs process,
> it clears up immediately.  When I restart Emacs, it's fine for a while, but
> then it eventually slows down again, and then killing it clears it up
> again. I've found other processes that are suspicious in terms of
> performance, but none of those had as much of an impact as the Emacs
> process.  Curiously, when I'm actually USING Emacs, I don't notice any
> particular slowdown.
> 
> My Emacs process mostly just sits, without very much foreground activity.
> I sometimes have pretty large file buffers, in the megabyte range.
> 
> I vaguely remember recently seeing some messages go by on the list about
> perf problems with Cygwin Emacs.  I didn't read them at the time, as I
> wasn't having an issue.
> 
> Cygwin 3.0.1(0.338/5/3); Emacs 26.1.

This might be due to a memory leak that was recently discovered and fixed.  See 
http://www.cygwin.org/ml/cygwin/2019-03/msg00122.html, and try the latest
cygwin snapshot.

Ken
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