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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
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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

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