X-Recipient: archive-cygwin AT delorie DOT com
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 5FEFB3858039
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cygwin.com;
	s=default; t=1690716573;
	bh=muhaIMllfoZVywQdrrVUchpceSjDFi4feYThAcQwfMY=;
	h=Date:Subject:To:References:In-Reply-To:List-Id:List-Unsubscribe:
	 List-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To:
	 From;
	b=CVs6tcD2qshnFZMEvBV3Owa7zdzIHNE5yTX9ixpGz4tZ1RsiMjcRHMsQfHgUpuNHo
	 6Clg/Tu8rHfQQVC2FchtcpqPhGuNm2gJy4Sg/pRuafXfJs3t/E4H/qCCcwDy2+Js7w
	 Hfy7O6MfiEIMiwmr/gyDUrrVYNCF9oU2cxx5yLaA=
X-Original-To: cygwin AT cygwin DOT com
Delivered-To: cygwin AT cygwin DOT com
DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 4B7003858D35
X-ASG-Debug-ID: 1690716552-24039d1345145bb00001-w5GHUG
X-Barracuda-Envelope-From: moss AT cs DOT umass DOT edu
X-Barracuda-RBL-Trusted-Forwarder: 128.119.240.136
Message-ID: <bf5f14f8-8dfd-13da-87b5-a0117fd04b05@cs.umass.edu>
X-Barracuda-RBL-Trusted-Forwarder: 192.168.50.148
Date: Sun, 30 Jul 2023 07:29:10 -0400
MIME-Version: 1.0
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:102.0) Gecko/20100101
 Thunderbird/102.13.0
Subject: Re: Probable bug
Content-Language: en-US
X-ASG-Orig-Subj: Re: Probable bug
To: natan_b AT libero DOT it, "cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
References: <199362107 DOT 5561484 DOT 1690709920649 AT mail1 DOT libero DOT it>
In-Reply-To: <199362107.5561484.1690709920649@mail1.libero.it>
X-Barracuda-Connect: mailsrv.cs.umass.edu[128.119.240.136]
X-Barracuda-Start-Time: 1690716553
X-Barracuda-Encrypted: ECDHE-RSA-AES128-GCM-SHA256
X-Barracuda-URL: https://barramail.cs.umass.edu:443/cgi-mod/mark.cgi
X-Virus-Scanned: by bsmtpd at cs.umass.edu
X-Barracuda-Scan-Msg-Size: 906
X-Barracuda-BRTS-Status: 1
X-Barracuda-Spam-Score: 0.00
X-Barracuda-Spam-Status: No, SCORE=0.00 using global scores of TAG_LEVEL=1000.0
 QUARANTINE_LEVEL=1000.0 KILL_LEVEL=5.7 tests=
X-Barracuda-Spam-Report: Code version 3.2, rules version 3.2.3.112074
 Rule breakdown below
 pts rule name              description
 ---- ---------------------- --------------------------------------------------
X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00, GB_TO_NAME_FREEMAIL,
 JMQ_SPF_NEUTRAL, KAM_DMARC_STATUS, NICE_REPLY_A, SPF_HELO_NONE, SPF_PASS,
 TXREP, T_SCC_BODY_TEXT_LINE 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: Eliot Moss via Cygwin <cygwin AT cygwin DOT com>
Reply-To: moss AT cs DOT umass DOT edu
Content-Transfer-Encoding: 7bit
Content-Type: text/plain; charset="us-ascii"; Format="flowed"
Sender: "Cygwin" <cygwin-bounces+archive-cygwin=delorie DOT com AT cygwin DOT com>

On 7/30/2023 5:38 AM, natan_b--- via Cygwin wrote:
> Hi Guys
> 
> very short.
> 
> prog.c
> 
> #include <stdio.h>
>   
> int main()
> {
> float a=1.283;
> while(1)
> printf( "%f", a );
> }
>   
> run with
> $ ./prog.exe >/dev/null
>   
> in windows monitor process the process increase it's memory it arrive to many  Gb.
> It's not a machine problem, other PC have same problem.
>   
> Same program in wsl and MSYS2 works well!

This probably has to do with output buffering, and may happen even without
the >/dev/null since there are no line ends in the output.  It may work with
stdbuf -o0 (as in: stdbuf -o0 ./prog.exe >/dev/null) but may cause the program
to run more slowly (each character is sent to the device, when then immediately
discards it).  It would seem you're hoping for the internal libraries to
recognize the case of writing to /dev/null ...

Regards - EM

-- 
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