System Monitor shows only 19 Cores

[mehly]

Description: Ubuntu 12.04 LTS
Release: 12.04
-----------------------------------------------------------------------

System Monitor shows:

under System (Processor: Intel® Xeon(R) CPU X5675 @ 3.07GHz × 19)

and under Resources all 24 Cores

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: firefox 12.0+build1-0ubuntu0.12.04.1
ProcVersionSignature: Ubuntu 3.2.0-24.39-generic 3.2.16
Uname: Linux 3.2.0-24-generic x86_64
NonfreeKernelModules: nvidia
AddonCompatCheckDisabled: False
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
AplayDevices: aplay: device_list:252: no soundcards found...
ApportVersion: 2.0.1-0ubuntu7
Architecture: amd64
ArecordDevices: arecord: device_list:252: no soundcards found...
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', '/dev/snd/controlC1', '/dev/snd/hwC1D0', '/dev/snd/hwC1D1', '/dev/snd/hwC1D2', '/dev/snd/hwC1D3', '/dev/snd/pcmC1D3p', '/dev/snd/pcmC1D7p', '/dev/snd/pcmC1D8p', '/dev/snd/pcmC1D9p', '/dev/snd/controlC0', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/pcmC0D1p', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
BuildID: 20120423122928
CRDA: Error: [Errno 2] No such file or directory
Channel: release
CurrentDmesg:
 [ 21.992749] tg3 0000:06:00.0: eth0: Flow control is on for TX and on for RX
 [ 21.993831] ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
 [ 32.358136] eth0: no IPv6 routers present
Date: Thu May 24 10:54:37 2012
ForcedLayersAccel: False
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
IpRoute:
 default via 172.16.0.1 dev eth0 proto static
 169.254.0.0/16 dev eth0 scope link metric 1000
 172.16.0.0/16 dev eth0 proto kernel scope link src 172.16.10.118 metric 1
IwConfig:
 lo no wireless extensions.

 eth0 no wireless extensions.
Plugins:
 iTunes Application Detector - Lib=librhythmbox-itms-detection-plugin.so, Location=/usr/lib/mozilla/plugins
 VLC Multimedia Plugin (compatible Totem 3.0.1) - Lib=libtotem-cone-plugin.so, Location=/usr/lib/mozilla/plugins
 DivX® Web Player - Lib=libtotem-mully-plugin.so, Location=/usr/lib/mozilla/plugins
 QuickTime Plug-in 7.6.6 - Lib=libtotem-narrowspace-plugin.so, Location=/usr/lib/mozilla/plugins
 Windows Media Player Plug-in 10 (compatible; Totem) - Lib=libtotem-gmp-plugin.so, Location=/usr/lib/mozilla/plugins
ProcEnviron:
 LANG=en_US.UTF-8
 SHELL=/bin/bash
Profiles: Profile0 (Default) - LastVersion=12.0/20120423122928
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
RfKill:

RunningIncompatibleAddons: False
SourcePackage: firefox
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/29/2011
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A12
dmi.board.name: 0CRH6C
dmi.board.vendor: Dell Inc.
dmi.board.version: A02
dmi.chassis.type: 7
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA12:bd12/29/2011:svnDellInc.:pnPrecisionWorkStationT5500:pvr:rvnDellInc.:rn0CRH6C:rvrA02:cvnDellInc.:ct7:cvr:
dmi.product.name: Precision WorkStation T5500
dmi.sys.vendor: Dell Inc.

[Robert Roth (evfool)]

Thank you for taking the time to report this bug. Could you please attach the file /proc/cpuinfo for further investigation?

[Brent Basbagill (bbasbagill)]

For what it is worth, I am also experiencing this bug. I'm running a dual six core xeon with hyperthreading (2x 6x 2 = 24 effective cores). Under the "Resources" tab all 24 cores are actively monitored however the "System" tab only shows 19 cores.

Ubuntu
Release 12.04 (precise) 64-bit
Kernel Linux 3.2.0.27-generic
GNOME 3.4.1
Processor: Intel(R) Xeon(R) CPU E5645 @ 2.4GHz x 19

Attached is my cpuinfo, which shows all effective 24 cores (Processors 0 - 23)
All cores are available to programs and the only downside appears to the the number of cores displayed in System Monitor "System" tab.

[Robert Roth (evfool)]

Could you please also check if System Settings-> Details -> Overview also reports the same?

[Brent Basbagill (bbasbagill)]

System Settings> Details> Overview

Is also reporting 19 cores instead of 24

"Intel(R) Xeon(R) CPU E5645 @ 2.40Ghz x 19"

[Robert Roth (evfool)]

Thank you for your bug report. This bug has been reported to the developers of the software. You can track it and make comments at: https://bugzilla.gnome.org/show_bug.cgi?id=681632

[Robert Roth (evfool)]

Could you please also attach the file /proc/stat for further debugging?

[Robert Roth (evfool)]

Thank you for reporting this bug to Ubuntu. Ubuntu 12.04 reached EOL on April 28, 2017.
See this document for currently supported Ubuntu releases: https://wiki.ubuntu.com/Releases

I've tried recreating this bug with your release and was unable to, given the information you've provided. Please upgrade to the latest version and re-test. If the bug is still reproducible, increase the verbosity of the steps to recreate it so we can try again.

Do feel free to report any other bugs you may find.