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Date: 3 May 2002 09:33:13 -0000
From: Avleen Vig <lists-sendpr@silverwraith.com>
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Subject: bin/37702: /usr/bin/top uses 100% cpu in 'system'
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>Number:         37702
>Category:       bin
>Synopsis:       /usr/bin/top uses 100% cpu in 'system'
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Fri May 03 02:40:01 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator:     Avleen Vig
>Release:        FreeBSD 4.4-RELEASE i386
>Organization:
Personal
>Environment:
System: FreeBSD apple.silverwraith.com 4.4-RELEASE
FreeBSD 4.4-RELEASE #0: Wed May 1 13:15:54 BST 2002
root@apple.silverwraith.com:/usr/src/sys/compile/APPLE.DEGUB i386

P166 MMX (intel), 128Mb RAM
Low load: 'load averages: 0.01, 0.13, 0.14'


	
>Description:
Running 'top -s' gives the following error:
top: option requires an argument -- s
Top version 3.4

But running 'top -s -o size' starts top and causes it to update
as fast as it can. This increases load (rate if increase depends
on box specs and other running procs), while top takes up as much
CPU time as it can.

After 5 mins on a very load load box:
load averages:  1.53,  0.85,  0.45

On a box where the initial load is:
load averages:  3.16,  1.95,  1.00
After 5 minute of broken top, we get:
load averages:  5.24,  3.91,  1.98

http_load also shows that requests don't always seem to complete
(ok, it's not the best test)
--- 60.0106 secs, 249 fetches started, 199 completed, 50 current

>How-To-Repeat:
Run: 'top -s -o size'. I don't recommend doing this on a heavily
loaded box straight away. Try it on your desktop. You can still
quit top easily with the 'q' key.

>Fix:
Unknown
>Release-Note:
>Audit-Trail:
>Unformatted:

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