Path: utzoo!attcan!uunet!codonics!bret
From: bret@codonics.COM (Bret Orsburn)
Newsgroups: comp.windows.x
Subject: Re: xperfmon under SunOs4.0*
Keywords: XPERFMON , SUNOS4.0*
Message-ID: <418@codonics.COM>
Date: 21 Nov 89 07:05:28 GMT
References: <726@corona.pb>
Reply-To: bret@codonics.com (Bret Orsburn)
Organization: Codonics, Inc., Middleburg Heights, OH
Lines: 33

In article <726@corona.pb> hsg@pbinfo.UUCP (Joerg Hoyer) writes:
>I have some trouble with xperfmon on Sun3 and Sun4 running under SunOs4.0*.
>xperfmon brings it's window up, but then dies it with floating point execption.
>
>I've found the problem in window.c in the function draw_background.
>If i = 3 in the second for-loop xperfmon dies in the following line:
>graph_list[i]->zero = graph_list[i]->min_pix + (graph_list[i]->min_value*SCALE(i));
>
>Has anyone had this problem too and fixed it ?

This is the second time this has appeared this week. I responded by Email
the first time, but will venture a follow-up this time.

For each quantity foo displayed, the SCALE macro does a division by

			(max_foo - min_foo)

In SunOS 4, the quantity used to represent Available Memory sometimes ranges
from 0 to 0, resulting in a divide by zero error.

The *correct* fix would be to locate a better data value to chart or to error
check the existing data.

The skill-level-zero fix is to add one to the denominator of the SCALE macro.

I leave it as an exercise for the reader to guess how I handled it ;-)


-- 

bret@codonics.com
uunet!codonics!bret
Bret Orsburn