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From:	Lee <ler762 AT gmail DOT com>
Date:	Mon, 23 May 2022 18:47:40 +0000
Message-ID:	<CAD8GWsvsNsF9w7NzxRDDDCwfcVkJp4_kVvwr6f7obCxi95-ZiQ@mail.gmail.com>
Subject:	Re: Cygwin Perl has slowed in recent months
To:	David Christensen <dpchrist AT holgerdanske DOT com>
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On 5/22/22, David Christensen <dpchrist AT holgerdanske DOT 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.

Another huge slowdown is Windows Defender.  Try turning that off and
seeing how long your 'make test' takes then.

Regards,
Lee

>
> The above module is proprietary, so I thought I would profile some
> similar CPAN modules to generate discussion information:
>
> 2022-05-22 01:25:39 dpchrist AT dht4s3r1 ~
> $ systeminfo | egrep '^OS (Name|Version)' ; uname -a ; cygcheck -c cygwin
> OS Name:                   Microsoft Windows 7 Professional
> OS Version:                6.1.7601 Service Pack 1 Build 7601
> CYGWIN_NT-6.1-7601 dht4s3r1 3.3.5-341.x86_64 2022-05-13 12:27 UTC x86_64
> Cygwin
> Cygwin Package Information
> Package              Version        Status
> cygwin               3.3.5-1        OK
>
> 2022-05-22 01:26:45 dpchrist AT dht4s3r1 ~
> $ cpan install Devel::NYTProf
> <snip>
> t/50-errno.t ............. 1/8
> #   Failed test '$! should not be altered by NYTProf i/o'
> #   at t/50-errno.t line 58.
> #          got: '0'
> #     expected: '3'
> # Looks like you failed 1 test of 8.
> t/50-errno.t ............. Dubious, test returned 1 (wstat 256, 0x100)
> Failed 1/8 subtests
> <snip>
> Test Summary Report
> -------------------
> t/50-errno.t           (Wstat: 256 Tests: 8 Failed: 1)
>    Failed test:  6
>    Non-zero exit status: 1
> Files=55, Tests=4736, 570 wallclock secs ( 0.64 usr  1.06 sys + 104.19
> cusr 403.73 csys = 509.62 CPU)
> Result: FAIL
> Failed 1/55 test programs. 1/4736 subtests failed.
> make: *** [Makefile:1284: test_dynamic] Error 255
>    JKEENAN/Devel-NYTProf-6.11.tar.gz
>    /usr/bin/make test -- NOT OK
> //hint// to see the cpan-testers results for installing this module, try:
>    reports JKEENAN/Devel-NYTProf-6.11.tar.gz
>
>
> STFW:
>
> https://github.com/Perl/perl5/issues/12389
>
>
> Any suggestions?
>
> David

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