[SOLVED] High CPU load when viewing LL forums.

[justme2]

Running LL2.6.
When viewing the forums anonymously (with the dark theme), my cpu runs hot, cycling between 5% up to 100% CPU usage and the fan runs fast with either Firefox or Chrome browsers. The PC behaves like a fan heater! When I log in, I use the lighter Curve theme as my default and the CPU usage drops to around 15% to 20%. The PC runs cooler and the fan slows down. Other websites seem to run at around 5% CPU, so what is going on in the LL forum and does anyone else have this problem or know the cause or cure?

Edit: High CPU load seems to occur when viewing the forum home page.

[rokytnji]

Only 11% for me. Try running firefox in safe mode. I am guessing a addon is te culprit here.

http://www.makeuseof.com/tag/how-to-use-...safe-mode/

[justme2]

Only 11% for me. Try running firefox in safe mode. I am guessing a addon is te culprit here.

http://www.makeuseof.com/tag/how-to-use-...safe-mode/

Thanks, I don't think I have any addons installed but will check later. I have discovered the same problem exists viewing the home page in windows/chrome too but only using the dafault dark theme.

The News Feed does not show in the Curve theme so I guess the changing feed is perhaps the cause.

[valtam]

have discovered the same problem exists viewing the home page in windows/chrome too.

In that case, we'd need to see your system specs too. Sounds like you have low end hardware.

[justme2]

[quote author=justme2 link=topic=2330.msg17642#msg17642 date=1443432397]
have discovered the same problem exists viewing the home page in windows/chrome too.

In that case, we'd need to see your system specs too. Sounds like you have low end hardware.
[/quote]

Windows PC has 2GB ram and 2.66GHz pentium 4 cpu
Netbook has  1GB ram and 1.2GHz Intel atom cpu

My latest finding is that shrinking the News feed panel on the home page reduces the cpu load to a range around 7% to 20% so at least I now know how to keep the CPU cooler!

[avj]

I also notice higher cpu usage on the forum home page, which corresponds with the changing news feed. I disabled all add ons in chrome and tried with the same results. I am including a screenshot of the resource monitor showing two minutes of forum viewing, the first minute was viewing the home page and the second minute is viewing this topic.



This is my hardware info.

Code:

inxi -Fxx
System:    Host: AOA150-1777 Kernel: 3.13.0-24-generic i686 (32 bit, gcc: 4.8.2)
           Desktop: Xfce 4.11.8 (Gtk 2.24.23) dm: lightdm Distro: Ubuntu 14.04 trusty
Machine:   System: Acer product: AOA150 version: 1
           Mobo: Acer model: N/A Bios: Acer version: v0.3310 date: 10/06/2008
CPU:       Single core Intel Atom CPU N270 (-HT-) cache: 512 KB flags: (nx pae sse sse2 sse3 ssse3) bmips: 3192.03
           Clock Speeds: 1: 1600.00 MHz 2: 1600.00 MHz
Graphics:  Card: Intel Mobile 945GSE Express Integrated Graphics Controller bus-ID: 00:02.0 chip-ID: 8086:27ae
           X.Org: 1.15.1 drivers: intel (unloaded: fbdev,vesa) Resolution: [email protected], [email protected]
           GLX Renderer: Mesa DRI Intel 945GME x86/MMX/SSE2 GLX Version: 1.4 Mesa 10.1.3 Direct Rendering: Yes
Audio:     Card: Intel NM10/ICH7 Family High Definition Audio Controller
           driver: snd_hda_intel bus-ID: 00:1b.0 chip-ID: 8086:27d8
           Sound: Advanced Linux Sound Architecture ver: k3.13.0-24-generic
Network:   Card-1: Realtek RTL8101E/RTL8102E PCI Express Fast Ethernet controller
           driver: r8169 ver: 2.3LK-NAPI port: 3000 bus-ID: 02:00.0 chip-ID: 10ec:8136
                Card-2: Qualcomm Atheros AR242x / AR542x Wireless Network Adapter (PCI-Express)
           driver: ath5k bus-ID: 03:00.0 chip-ID: 168c:001c
Drives:    HDD Total Size: 410.1GB (26.2% used)
           1: id: /dev/sda model: WDC_WD1600BEVT size: 160.0GB serial: WD-WXE908UP2087
           2: USB id: /dev/sdb model: FreeAgent_Go size: 250.1GB serial: 2GE20QLB-0:0
Partition: ID: / size: 146G used: 101G (73%) fs: ext4 ID: swap-1 size: 1.06GB used: 0.27GB (25%) fs: swap
RAID:      System: supported: N/A
           No RAID devices detected - /proc/mdstat and md_mod kernel raid module present
           Unused Devices: none
Sensors:   System Temperatures: cpu: 57.0C mobo: N/A
           Fan Speeds (in rpm): cpu: N/A
Info:      Processes: 169 Uptime: 3:51 Memory: 446.2/988.7MB Runlevel: 2 Gcc sys: 4.8.4
           Client: Shell (bash 4.3.11 running in x-terminal-emul) inxi: 1.9.17

Hiding the news feed header solves this problem for me.

[justme2]

Thanks avj, you have provided the evidence I did not have time to prepare, before you posted. The news feed is obviously the cause of problem. In my case it was exacerbated by the fact that I usually kept the home page open and viewed posts in another tab, so the CPU load was always nearly 100% - hence the heat generated. Shrinking the News Feed panel on the home page reduces the cpu loading dramatically.

[Wirezfree]

It appears this is a common issue, not just LL website, just have a Google around.
Depending on your H/W, you may just never have noticed it...
I do remember on my old PC, with WinXP, Chrome with 6 tabs used to run CPU to 70~80%

[valtam]

I've disabled the fader for now as a test and it has reduced cpu here. How does the news block look?

[avj]

Looks fine to me.  My cpu still goes to about 90% when the feed changes.