java hogging CPU (both Firefox/Chrome) temps skyrocket

[UbuNoob001]

Hi all, I am new to linux and ubuntu 10.04_64

I am currently running Firefox and Chrome, however I am getting the same problem with both. When opening a site with Java usage, i have terrible CPU hogging and battery usage (battery life goes from 2+ hrs to 30 min max). Also CPU temps go from 49 to 69 deg with fan on constantly

output of top before Java site loading:
$ top

top - 15:40:36 up 10 min, 2 users, load average: 1.04, 0.67, 0.33
Tasks: 164 total, 3 running, 161 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.8%us, 1.0%sy, 0.0%ni, 97.5%id, 0.0%wa, 0.3%hi, 0.3%si, 0.0%st
Mem: 3052112k total, 983876k used, 2068236k free, 44744k buffers
Swap: 4022264k total, 0k used, 4022264k free, 427704k cached

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
1171 root 20 0 163m 31m 13m S 1 1.1 0:37.26 Xorg
4 root 20 0 0 0 0 S 1 0.0 0:00.21 ksoftirqd/0
7 root 20 0 0 0 0 S 0 0.0 0:00.38 ksoftirqd/1
1549 administ 20 0 199m 12m 9540 S 0 0.4 0:00.21 notify-osd
1763 administ 20 0 525m 103m 29m S 0 3.5 0:20.62 firefox-bin
1809 administ 20 0 70944 12m 9156 R 0 0.4 0:01.95 npviewer.bin
1831 administ 20 0 293m 17m 12m S 0 0.6 0:01.51 gnome-terminal and after:
$ top

top - 15:41:51 up 11 min, 2 users, load average: 1.10, 0.77, 0.39
Tasks: 165 total, 3 running, 162 sleeping, 0 stopped, 0 zombie
Cpu(s): 54.8%us, 2.6%sy, 0.0%ni, 41.6%id, 0.0%wa, 1.0%hi, 0.0%si, 0.0%st
Mem: 3052112k total, 1304184k used, 1747928k free, 45140k buffers
Swap: 4022264k total, 0k used, 4022264k free, 488432k cached

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
1896 administ 20 0 1286m 267m 18m S 100 9.0 0:44.80 java
1171 root 20 0 173m 31m 13m S 6 1.1 0:42.93 Xorg
1763 administ 20 0 554m 104m 29m S 3 3.5 0:30.17 firefox-bin
1809 administ 20 0 70944 12m 9156 S 2 0.4 0:03.03 npviewer.bin
1831 administ 20 0 309m 17m 12m S 2 0.6 0:02.55 gnome-terminal
1423 administ 20 0 319m 34m 8612 S 1 1.1 0:09.78 compiz any help would be greatly appreciated.

[lovinglinux]

Does it happen with all sites or just a particular one?

Are you sure is Java and not Javascript? This problem is not uncommon with some web sites with bad javascript. I would recommend installing NoScript (https://addons.mozilla.org/en-US/firefox/addon/722/) for Firefox and block scripts for third-party sites, even for allowed sites.

[Shpongle]

+1 yea no script is really a must for the web , try run firefox / chromium form the command line eg type firefox to start firefox. and use it as normal and it will say if there are any problems when loading the page . paste back the output if any

[dummy910]

i will endorse here as well, the no script ad-on... it's a must have for any mozilla based browser. http://noscript.net/

[stoogiebuncho]

I had the same problem.

In order to fix it, I had to install the Sun version of Java (instead of the open-source version that is installed by default).

To install, put this in a terminal:

sudo apt-get install sun-java6-jre sun-java6-plugin

Next, you have to tell Ubuntu to use the Sun Java instead of the other one:

sudo update-java-alternatives -s java-6-sun

You'll need to restart firefox, but it should be fixed.

[harto]

In order to fix it, I had to install the Sun version of Java (instead of the open-source version that is installed by default).
Next, you have to tell Ubuntu to use the Sun Java instead of the other one:

Those packages did install fine, but when attempting the 2nd command, I get errors like this:


~$ sudo update-java-alternatives -s java-6-sun
update-alternatives: error: no alternatives for appletviewer.
update-alternatives: error: no alternatives for apt.
update-alternatives: error: no alternatives for extcheck.
.
.
.
and this...


update-java-alternatives: jdk alternative does not exist: /usr/lib/jvm/java-6-sun/bin/appletviewer
update-java-alternatives: jdk alternative does not exist: /usr/lib/jvm/java-6-sun/bin/apt
update-java-alternatives: jdk alternative does not exist: /usr/lib/jvm/java-6-sun/bin/extcheck
.
.
.


EDIT: DESPITE ONLY OUTPUT BEING THESE ERRORS IT WORKED! THANKS A LOT! :)

[philinux]

sudo update-alternatives --config java

It's this bug by the way.

https://bugs.launchpad.net/bugs/551328