Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Subscribe: <mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive: <http://sources.redhat.com/ml/cygwin/>
List-Post: <mailto:cygwin AT cygwin DOT com>
List-Help: <mailto:cygwin-help AT cygwin DOT com>, <http://sources.redhat.com/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
From: "Ross Boulet" <ross AT rossb DOT com>
To: <cygwin AT cygwin DOT com>
Subject: RE: limiting strace?, was: failure of unzip and recent cygwin1.dll
Date: Wed, 18 Feb 2004 13:28:28 -0600
Message-ID: <002301c3f655$684a2ad0$6401a8c0@RossLap>
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
In-Reply-To: <Pine.GSO.4.56.0402161553580.26191@slinky.cs.nyu.edu>
X-IsSubscribed: yes
Content-Transfer-Encoding: 8bit
X-MIME-Autoconverted: from quoted-printable to 8bit by delorie.com id i1IJTUCi009936

> 
> On Mon, 16 Feb 2004, Thomas L Roche wrote:
> 
> > Is there a way to limit the size of the strace output _file_, rather
> > than just the output file buffer, while preserving desired
> > information?
> >
> > I previously used strace to debug the problem that 20040213 
> induced in
> > emacs 'desktop', therefore in emacs' startup; nevertheless the
> > resulting strace.out was > 21 MB. Thus I am somewhat 
> hesitant to avail
> > myself of
> >
> > Christopher Faylor Sun, 15 Feb 2004 21:12:02 -0500
> > > more strace output for the failing condition, meaning 
> that if you do
> > > this:
> >
> > >   strace -o strace.out unzip whatever
> >
> > > it should produce a large strace file.
> >
> > (quite the understatement :-) since
> >
> > * the unzip SEGVs typically occur after 30-60 min runtime
> >
> > * I have < 5 GB free space.
> >
> > Is there a way to limit the file size directly, or to script its
> > rotation?
> >
> > Alternatively, is there a recommended mask setting that 
> will preserve
> > the desired information, while not blowing out my disk? I'm assuming
> > 'malloc' would be part of the recommended setting: anything else?
> 
> You're on Cygwin, man!  Use the scripting tools! :-)
> 
> Don't forget that strace by default sends the trace to 
> stdout.  You can
> then pipe it to any program you wish (e.g., "tail -100", or 
> "grep -v ...",
> or a whole bunch of others).  You can then redirect the 
> output of the pipe
> chain to a file, if you wish...
> 	Igor
> -- 

Just adding my 2 cents and hopefully to learn something:

I know how to use pipes but I don't know how they are handled "under the
covers".  Wouldn't piping the strace to tail or grep still produce a
temporary file of a large size?  I don't know if the original poster is
concerned with disk space or only the output.  If it's a space issue and a
temporary file is created for the pipe, I can see why he would want to limit
the strace output directly.  If its just the result, it seems tail or grep
would be good options.

Ross



--
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/