X-Recipient: archive-cygwin AT delorie DOT com
X-Spam-Check-By: sourceware.org
From: "Dave Korn" <dave DOT korn AT artimi DOT com>
To: <cygwin AT cygwin DOT com>
References: <47616D31 DOT 7090002 AT 4raccoons DOT com>
Subject: RE: VM and non-blocking writes
Date: Thu, 13 Dec 2007 17:45:45 -0000
Message-ID: <010201c83daf$fd1aeaf0$2e08a8c0@CAM.ARTIMI.COM>
MIME-Version: 1.0
Content-Type: text/plain; 	charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
X-Mailer: Microsoft Office Outlook 11
In-Reply-To: <47616D31.7090002@4raccoons.com>
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

On 13 December 2007 17:35, Wayne Christopher wrote:

> What I see is that no matter how large the size is that I give to
> write(), the return value is always the full size.  Also, I see the
> virtual memory used by my process go way up - in fact it goes up by much
> more than the amount of data I've written.
> 
> I tried putting in a limit of 10KB in the size given to the write()
> call.  I still see the VM size grow - more slowly this time, but it
> eventually reaches 1.5GB and then I'm out of memory.
> 
> Has anybody seen this behavior?  

  Dunno about anyone else, but I haven't.

> Should I not be using O_NDELAY?  

  It's supposed to work; it's always possible you've hit on a bug.

> Any other workarounds?
> 
> I don't have a simple example program but I can make one if that will help.

  Yes, it would be a good idea; let's see if anyone can reproduce the problem.

  What firewall/antispyware/other net-related security software do you have
installed?


    cheers,
      DaveK
-- 
Can't think of a witty .sigline today....


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