Hi Adam,

It would be nice to contribute, although my knowledge is not high, I could
review problems and try things.

There are two things that are difficult for me. One is to search the Cygwin
Archives, you could have a way to search for them directly on the Cygwin
website. And another is to have powerful tools to look for problems and a
FAQ where they can explain their use in detail (windows and linux tools).

I think it's not all problems in Cygwin, many times they are conflicts with
other software (antivirus is one).

Specifically for this problem, I have investigated the problem and can be
related to pipes and antivirus.

while true
echo ABC | grep AAA

It makes the cpu of that antivirus go up.

I have seen that the pipes make use of \??\pipe routes which I have seen at

I have it configured to exclude c:\cygwin64 and perhaps those paths of
those pipes are having effects in that other software.

By now this...


El lun., 8 abr. 2024 21:48, Adam Dinwoodie <a...@dinwoodie.org> escribió:

> On Fri, 5 Apr 2024 at 16:19, J M via Cygwin wrote:
> >
> > Hi,
> >
> > I'm seeing that Cygwin is a bit slow, directly and after comparing to
> > simple ubuntu virtual machines by example.
> >
> > Specifically:
> >
> > - Copy and paste texts in vim, I see clearly the slow in paste.
> > - Using sed and/or grep that count approx. between 6x and 8x respect to
> > virtual machine simple ubuntu.
> > - In general multiple bash commands are slower.
> >
> > Can you analyze this?
> >
> > I'm use the last updated Windows 11 and a fresh Cygwin.
> This is expected. Cygwin runs as a compatibility layer between Windows
> and the POSIX applications, and that compatibility layer has
> significant performance overheads. Running in a virtual machine –
> including WSL – has far fewer of those overheads, at the expense of
> requiring a complete separate operating system, all the virtualisation
> infrastructure, and poorer access to the Windows OS.
> There is clearly a trade-off here, and for a lot of folk who would
> have used Cygwin in the past, WSL is going to be a better choice:
> those disadvantages are much less relevant than they were five or ten
> years ago. Obviously, if you have ideas for how to improve Cygwin
> performance, the project is always looking for volunteers; there's
> more information at https://cygwin.com/contrib.html.
> Adam

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