X-Recipient: archive-cygwin AT delorie DOT com
X-SWARE-Spam-Status: No, hits=-1.5 required=5.0 	tests=AWL,BAYES_00,J_CHICKENPOX_54,SPF_PASS
X-Spam-Check-By: sourceware.org
Message-ID: <20090730235347.47286.qmail@web3301.mail.ogk.yahoo.co.jp>
Date: Fri, 31 Jul 2009 08:53:47 +0900 (JST)
From: Tatsuro MATSUOKA <tmacchant2 AT yahoo DOT co DOT jp>
Reply-To: matsuoka AT nuce DOT nagoya-u DOT ac DOT jp
Subject: Re: How cygwin realize posix pipe?
To: Haojun Bao <baohaojun AT gmail DOT com>, cygwin AT cygwin DOT com
In-Reply-To: <7v1vny2sjg.fsf@gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=iso-2022-jp
X-IsSubscribed: yes
Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm
Precedence: bulk
List-Id: <cygwin.cygwin.com>
List-Unsubscribe: <mailto:cygwin-unsubscribe-archive-cygwin=delorie DOT com AT cygwin DOT com>
List-Subscribe: <mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive: <http://sourceware.org/ml/cygwin/>
List-Post: <mailto:cygwin AT cygwin DOT com>
List-Help: <mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs>
Sender: cygwin-owner AT cygwin DOT com
Mail-Followup-To: cygwin AT cygwin DOT com
Delivered-To: mailing list cygwin AT cygwin DOT com

Hello

--- Haojun Bao  wrote:
> 
> So one of your program is native and the other cygwin.
> 
> It's like a similar issue I met when using native Emacs+Gnus and cygwin
> programs (openssl client) to read imap mails, it is very slow.
> 
> I guess it was a pipe size issue, for old DOS compatibility, the pipe
> buffer is 64K, and if I check the i/o rate of openssl with Procexp, I
> can see something like 64K.
> 
> This is a very wild guess though. First I see sth. in Procexp to be
> about 64K, then I googled with "windows pipe 64k". Maybe you can try
> tweak the pipe buffer size.
> 
Thank you for your kind advises.

Tatsuro

--------------------------------------
Power up the Internet with Yahoo! Toolbar.
http://pr.mail.yahoo.co.jp/toolbar/

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