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Date: Mon, 26 Jul 2004 11:31:16 +0200
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: Setting SHMMAX in Cygwin
Message-ID: <20040726093116.GB30714@cygbert.vinschen.de>
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References: <001a01c47281$c8b02070$99280518 AT Gene> <20040726083046 DOT GA732 AT cygbert DOT vinschen DOT de> <002b01c472f1$c5d26000$99280518 AT Gene>
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On Jul 26 02:20, Gene C. Ruzicka wrote:
> 
> > 
> > > Further comment: Uncovering this information was somewhat painful.
> > 
> > Didn't you read /usr/share/doc/Cygwin/cygserver.README and in turn
> > /etc/cygserver.conf in the first place?  The configuration file contains
> > the comment
> > 
> >   "kern.ipc.shmmaxpgs: Maximum pages available for XSI shared memory."
> > 
> > I thought that explains it.
> > 
> > 
> > Corinna
> > 
> You are correct that those files explain how to set shmmaxpgs, and
> I noticed that early on. The problem is that I wanted to set shmmax, NOT
> shmmaxpgs per se, but it seems that the only place that spells out the relationship 
> between the two parameters --- thereby suggesting the means to adjust shmmax ---
> is in function shminit, which is rather deeply embedded in the source code tree:
> file /usr/src/cygwin/winsup/cygserver/sysgv_shm.cc to be precise.

I've changed the text in cygserver.conf to this:

# kern.ipc.shmmaxpgs: Maximum pages available for XSI shared memory.
# Changing shmmaxpgs immediately affects setting SHMMAX.  The relation
# between shmmaxpgs and SHMMAX is:  SHMMAX = shmmaxpgs * getpagesize().
# Default: 8192, Min: 1, Max: 32767
#kern.ipc.shmmaxpgs 8192


HTH,
Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Co-Project Leader          mailto:cygwin AT cygwin DOT com
Red Hat, Inc.

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