From owner-freebsd-current  Mon Jan 15 15: 9:54 2001
Delivered-To: freebsd-current@freebsd.org
Received: from netau1.alcanet.com.au (ntp.alcanet.com.au [203.62.196.27])
	by hub.freebsd.org (Postfix) with ESMTP id 4DFF337B69D
	for <current@FreeBSD.ORG>; Mon, 15 Jan 2001 15:09:36 -0800 (PST)
Received: from mfg1.cim.alcatel.com.au (mfg1.cim.alcatel.com.au [139.188.23.1])
	by netau1.alcanet.com.au (8.9.3 (PHNE_22672)/8.9.3) with ESMTP id KAA08778;
	Tue, 16 Jan 2001 10:09:31 +1100 (EDT)
Received: from gsmx07.alcatel.com.au by cim.alcatel.com.au
 (PMDF V5.2-32 #37645) with ESMTP id <01JYYZ7G10I8GKTZKQ@cim.alcatel.com.au>;
 Tue, 16 Jan 2001 10:09:37 +1100
Received: (from jeremyp@localhost)	by gsmx07.alcatel.com.au (8.11.0/8.11.0)
 id f0FN9SA38579; Tue, 16 Jan 2001 10:09:28 +1100 (EST envelope-from jeremyp)
Content-return: prohibited
Date: Tue, 16 Jan 2001 10:09:28 +1100
From: Peter Jeremy <peter.jeremy@alcatel.com.au>
Subject: Re: number of processes forked since boot
In-reply-to: <Pine.BSF.4.20.0101152321530.13323-100000@mx.webgiro.com>; from
 abial@webgiro.com on Mon, Jan 15, 2001 at 11:24:22PM +0100
To: Andrzej Bialecki <abial@webgiro.com>
Cc: current@FreeBSD.ORG
Mail-followup-to: Andrzej Bialecki <abial@webgiro.com>, current@FreeBSD.ORG
Message-id: <20010116100928.H91029@gsmx07.alcatel.com.au>
MIME-version: 1.0
Content-type: text/plain; charset=us-ascii
Content-disposition: inline
User-Agent: Mutt/1.2.5i
References: <20010116.025742.74757685.ume@FreeBSD.org>
 <Pine.BSF.4.20.0101152321530.13323-100000@mx.webgiro.com>
Sender: owner-freebsd-current@FreeBSD.ORG
Precedence: bulk
X-Loop: FreeBSD.ORG

On 2001-Jan-15 23:24:22 +0100, Andrzej Bialecki <abial@webgiro.com> wrote:
>On Tue, 16 Jan 2001, Hajimu UMEMOTO wrote:
...
>> +static unsigned int nforks = 0;
>> +SYSCTL_UINT(_kern, KERN_NFORKS, nforks, CTLFLAG_RD, &nforks, 0, "");
>
>If any, I think this should be long, otherwise on machines like web
>servers the counter will overflow in a short time.

On an i386, "long" and "int" are both 32 bits, hence "long" has a
lower maximum count than "unsigned int".  "unsigned long" might be
a better choice (to give a greater range on the Alpha).

In any case, at 1000 forks/sec, a 32-bit counter will still take
nearly 50 days to wrap.  Lots of other counters will have wrapped
by this time.

Peter


To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-current" in the body of the message