Bug 1254332 – Unreliable cpu detection through glibtop

Bug 1254332 - Unreliable cpu detection through glibtop

Summary:	Unreliable cpu detection through glibtop

Status:	CLOSED ERRATA

Aliases:	None

Product:	Red Hat Enterprise Linux 7
Classification:	Red Hat
Component:	gnome-system-monitor (Show other bugs)
Sub Component:
Version:	7.2
Hardware:	All Linux

Priority	unspecified Severity low
Target Milestone:	rc
Target Release:	---
Assigned To:	David King
QA Contact:	Desktop QE
Docs Contact:

URL:
Whiteboard:
Keywords:

Depends On:
Blocks:
	Show dependency tree / graph

Reported:	2015-08-17 14:09 EDT by Helio Chissini de Castro
Modified:	2015-11-19 02:34 EST (History)
CC List:	4 users (show)

See Also:
Fixed In Version:	gnome-system-monitor-3.14.1-3.el7
Doc Type:	Bug Fix
Doc Text:	Cause: a CPU core is completely idle, which is considerably more likely to occur with many CPUs. Consequence: gnome-system-monitor reports an incorrect number of CPUs; it stops counting when it encounters one with zero load Fix: a patch was added to query the number of CPUs from the system directly Result: the correct number of CPUs are detected, regardless of CPU load on a particular CPU
Story Points:	---
Clone Of:
Environment:
Last Closed:	2015-11-19 02:34:13 EST
Type:	Bug
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

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External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
GNOME Bugzilla	753731	None	None	None	Never

Groups: None (edit)

Description Helio Chissini de Castro 2015-08-17 14:09:13 EDT

glibtop not provides the number of cpus on the machine directly, relying on a list with the current load of each core.

Original code assume that a 0 load core is the end of cpu list, which is invalid in cases of machines with high number of cores, that happens to some cores stay idle with 0 load.

Since this can happens in any core number, if a machine has 192 cores, but the core number 5 has 0 load, then 4 cores will be wrongly reported.

Using standard sysconf api solves the issue in a simple way.

Reference:
https://bugzilla.gnome.org/show_bug.cgi?id=753731

Comment 8 errata-xmlrpc 2015-11-19 02:34:13 EST

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2015-2215.html

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