X-Recipient:	archive-cygwin AT delorie DOT com
DKIM-Filter:	OpenDKIM Filter v2.11.0 sourceware.org 9D8C2390CE87
DKIM-Signature:	v=1; a=rsa-sha256; c=relaxed/relaxed; d=cygwin.com;
	s=default; t=1670441953;
	bh=mI6YCxfs9588BoJnLuDctbVr5cqz7hiBUbjbOYalSOQ=;
	h=Date:To:Subject:List-Id:List-Unsubscribe:List-Archive:List-Post:
	List-Help:List-Subscribe:From:Reply-To:From;
	b=NKRvNETL48etNqNSyVCqC4yxgmGUErIOzvKJb93DpyqZ7umfvjGRjFSVlAhbqJQ6E
	c4iVKQgkONhVFd4OomDNdcAYxa6WBUrqCQc3nuE/3TWCXr8lZwEqpDCfPgZFu/2sa1
	+Goqzz5DxN9EwaRMEAVC9aY+nU0PccNCeJG9gDUw=
X-Original-To:	cygwin AT cygwin DOT com
Delivered-To:	cygwin AT cygwin DOT com
DMARC-Filter:	OpenDMARC Filter v1.4.1 sourceware.org 164893834C01
Date:	Wed, 07 Dec 2022 19:38:19 +0000
To:	"cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
Subject:	Performance regression in cygwin 3.4.0
Message-ID:	<Abw9_BgkZRll8zEaAWSNVO1Uw0sF_--Amd02G5fpj3r5O6QBhyqjWu2cxV1IctJtM03OGztfZx60TEIYfDi34p3_unluAxKgQDzcsYZASxY=@proton.me>
Feedback-ID:	63211331:user:proton
MIME-Version:	1.0
X-Spam-Status:	No, score=0.3 required=5.0 tests=BAYES_05, DKIM_SIGNED,
	DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, KAM_INFOUSMEBIZ, KAM_NUMSUBJECT,
	RCVD_IN_MSPIKE_H2, SPF_HELO_PASS, SPF_PASS,
	TXREP autolearn=no 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-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:	tryandbuy via Cygwin <cygwin AT cygwin DOT com>
Reply-To:	tryandbuy <tryandbuy AT proton DOT me>
Sender:	"Cygwin" <cygwin-bounces+archive-cygwin=delorie DOT com AT cygwin DOT com>

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


-- 
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 -