X-Recipient:	archive-cygwin AT delorie DOT com
DKIM-Filter:	OpenDKIM Filter v2.11.0 sourceware.org 16C8F3873CD3
DKIM-Signature:	v=1; a=rsa-sha256; c=relaxed/relaxed; d=cygwin.com;
	s=default; t=1670492906;
	bh=R4g3BONYBDHaVxZkEBmFPGcmJdxyEUKQ3fkYqmYbEQo=;
	h=Date:To:Cc:Subject:In-Reply-To:References:List-Id:
	List-Unsubscribe:List-Archive:List-Post:List-Help:List-Subscribe:
	From:Reply-To:From;
	b=GU2uvM8jF83Sr7b/9ZtPCsQ6u6ACR8E1dzLJAfOp886HI0+8oA1X70scwmnhyaaPf
	NDzD4eRqva44o8gXCNLPIhNtgYn6z8b8CWc3bNrA7CXgwE6XbYDnIOTAZJeuP92+uF
	Xj7UMKQ7asprNHca+dLWqnn2Fe3fl7z9REJJkIOA=
X-Original-To:	cygwin AT cygwin DOT com
Delivered-To:	cygwin AT cygwin DOT com
DMARC-Filter:	OpenDMARC Filter v1.4.1 sourceware.org 1A30A384092F
DKIM-Filter:	OpenDKIM Filter v2.10.3 conssluserg-04.nifty.com 2B89ktZl001501
X-Nifty-SrcIP:	[220.150.135.41]
Date:	Thu, 8 Dec 2022 18:46:56 +0900
To:	cygwin AT cygwin DOT com
Cc:	tryandbuy <tryandbuy AT proton DOT me>
Subject:	Re: Performance regression in cygwin 3.4.0
Message-Id:	<20221208184656.ea6b9796eccc503c1e238f0f@nifty.ne.jp>
In-Reply-To:	<Abw9_BgkZRll8zEaAWSNVO1Uw0sF_--Amd02G5fpj3r5O6QBhyqjWu2cxV1IctJtM03OGztfZx60TEIYfDi34p3_unluAxKgQDzcsYZASxY=@proton.me>
References:	<Abw9_BgkZRll8zEaAWSNVO1Uw0sF_--Amd02G5fpj3r5O6QBhyqjWu2cxV1IctJtM03OGztfZx60TEIYfDi34p3_unluAxKgQDzcsYZASxY=@proton.me>
X-Mailer:	Sylpheed 3.7.0 (GTK+ 2.24.30; i686-pc-mingw32)
Mime-Version:	1.0
X-Spam-Status:	No, score=-4.3 required=5.0 tests=BAYES_00, DKIM_SIGNED,
	DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, KAM_NUMSUBJECT, NICE_REPLY_A,
	RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS,
	TXREP autolearn=ham autolearn_force=no version=3.4.6
X-Spam-Checker-Version:	SpamAssassin 3.4.6 (2021-04-09) on
	server2.sourceware.org
X-BeenThere:	cygwin AT cygwin DOT com
X-Mailman-Version:	2.1.29
List-Id:	General Cygwin discussions and problem reports <cygwin.cygwin.com>
List-Unsubscribe:	<https://cygwin.com/mailman/options/cygwin>,
	<mailto:cygwin-request AT cygwin DOT com?subject=unsubscribe>
List-Archive:	<https://cygwin.com/pipermail/cygwin/>
List-Post:	<mailto:cygwin AT cygwin DOT com>
List-Help:	<mailto:cygwin-request AT cygwin DOT com?subject=help>
List-Subscribe:	<https://cygwin.com/mailman/listinfo/cygwin>,
	<mailto:cygwin-request AT cygwin DOT com?subject=subscribe>
From:	Takashi Yano via Cygwin <cygwin AT cygwin DOT com>
Reply-To:	Takashi Yano <takashi DOT yano AT nifty DOT ne DOT jp>
Errors-To:	cygwin-bounces+archive-cygwin=delorie DOT com AT cygwin DOT com
Sender:	"Cygwin" <cygwin-bounces+archive-cygwin=delorie DOT com AT cygwin DOT com>

On Wed, 07 Dec 2022 19:38:19 +0000
tryandbuy wrote:
> Reading from stdin is very slow when a process runs outside of Cygwin Terminal.
> 
> Steps to reproduce:
> 1. Create "test.txt" file using python code:
> long_text = "10" * 2500
> with open(r'test.txt', 'w') as f:
>     for i in range(5000):
>         f.write('KEY%03d: %d => %s\n' % (i % 100, i, long_text))
> 
> 2. Install "cygwin" package version > "3.3.6-1"
> 3. Open windows command prompt (cmd.exe)
> 4. Enter command:
> type test.txt | c:\cygwin64\bin\wc.exe -l
> 
> When running the same command (use cat instead of type) on the Cygwin Terminal, no performance issues observed.
> 
> The last version of cygwin package without issues: 3.3.6-1
> Versions of cygwin package with issues: 3.4.x - 3.5.x
> 
> P.S. I tested this combinations of pipings:
> cygwin_prog | win_prog    # no issues
> win_prog | cygwin_prog    # has issues when running in windows command prompt, no issues in Cygwin Terminal
> cygwin_prog | cygwin_prog # has issues  when running in windows command prompt, no issues in Cygwin Terminal

I confirmed the problem. I also identified the code difference,
which causes the problem, between cygwin 3.3.x and 3.4.0.

Let us consider how to fix that.

-- 
Takashi Yano <takashi DOT yano AT nifty DOT ne DOT jp>

-- 
Problem reports:      https://cygwin.com/problems.html
FAQ:                  https://cygwin.com/faq/
Documentation:        https://cygwin.com/docs.html
Unsubscribe info:     https://cygwin.com/ml/#unsubscribe-simple

- Raw text -