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From: Csaba Raduly <rcsaba@gmail.com>
Date: Tue, 24 May 2022 10:25:43 +0200
Message-ID: <CAEhDDbCOq5azJwRb_dpC4CgNFhe=w2n3ZJCcZ04H4VOFFMgrDg@mail.gmail.com>
Subject: Re: Cygwin Perl has slowed in recent months
To: Lee <ler762@gmail.com>
Cc: cygwin list <cygwin@cygwin.com>
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On Mon, 23 May 2022 at 20:47, Lee  wrote:
>
> On 5/22/22, David Christensen <dpchrist@holgerdanske.com> wrote:
> > On 5/21/22 10:55, Hans-Bernhard Bröker wrote:
> >> Am 18.05.2022 um 03:53 schrieb David Christensen:
> >>
> >>  > I am working on a Perl module that runs on various Unix-like platforms.
> >>  > When I 'make test' on similar computers:
> >>  >
> >>  > FreeBSD 12.3-RELEASE         28 wallclock secs
> >>  > Debian GNU/Linux 11.3          31 wallclock secs
> >>  > macOS 11.6.2              36 wallclock secs
> >>  > Windows 7 / Cygwin 3.3.5-1    509 wallclock secs
> >>
> >> Given the complete lack of information about what that Perl module of
> >> yours might be doing, that's hard to have a meaningful discussion about.
> >
> >
> > Thank you for the response.  I was hoping there was a known issue.
> > Apparently, not.
>
> What I consider a well known issue is that process start up time is
> _very_ slow.  If your  'make test' starts lots of processes that could
> be a problem.
>

While Cygwin''s fork emulation is indeed  slow (I once measured 1000:1
between Cygwin and Linux  * ),
"make test" likely started roughly the same number of processes "then"
as it does  "now".
In  which case the increase in the run time could be attributed to Cygwin.

*  "The marvel is not that the bear dances  well,  but that the bear
dances at all"  - Russian proverb
-- 
You can get very substantial performance improvements
by not doing the right thing. - Scott Meyers, An Effective C++11/14 Sampler
So if you're looking for a completely portable, 100% standards-conformant way
to get the wrong information: this is what you want. - Scott Meyers (C++TDaWYK)

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