[SOLVED] java hogging CPU (both Firefox/Chrome) temps skyrocket

Ubunoob001 · 06-01-2010, 03:54 PM

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:

Code:

$ 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:

Code:

$ 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.

paulsm4 · 06-01-2010, 07:14 PM

Q: Are you sure this particular site just doesn't have a poorly written applet that happens to be a CPU hog? Have you tried other applets on other sites?

Q: Did you try downloading the Sun JRE (and de-installing Gnu Java, if it happens to be the default on your system)?

Ubunoob001 · 06-01-2010, 08:03 PM

Quote:

Originally Posted by paulsm4

Q: Are you sure this particular site just doesn't have a poorly written applet that happens to be a CPU hog? Have you tried other applets on other sites?

Q: Did you try downloading the Sun JRE (and de-installing Gnu Java, if it happens to be the default on your system)?

1. I have noticed it on at least two other sites. Also, it doesn't happen on Win or OSX.
2. No i haven't. Let me try this...

syg00 · 06-01-2010, 09:05 PM

And I always thought chewing up machines was one of the design criteria for Java ...
Write once, debug everywhere.

paulsm4 · 06-02-2010, 01:47 AM

Hi -

This sounds like it might help, too:

http://blog.taragana.com/index.php/a...ox-in-2-steps/

IMHO .. PSM

Ubunoob001 · 06-05-2010, 08:35 PM

Quote:

Originally Posted by paulsm4

Q: Did you try downloading the Sun JRE (and de-installing Gnu Java, if it happens to be the default on your system)?

This did infact work. My cpu usage went from 100% to about 4% for Java usage.

I followed the instructions at http://sites.google.com/site/easylinuxtipsproject/java

Thanks for the advice!