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Re: How cygwin realize posix pipe?
- From: Tatsuro MATSUOKA <tmacchant2 at yahoo dot co dot jp>
- To: Haojun Bao <baohaojun at gmail dot com>, cygwin at cygwin dot com
- Date: Fri, 31 Jul 2009 08:53:47 +0900 (JST)
- Subject: Re: How cygwin realize posix pipe?
- Reply-to: matsuoka at nuce dot nagoya-u dot ac dot jp
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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