100% CPU in IcedTea plugin

[Jiri Vanek]

On 01/09/2014 02:12 AM, Stefan Reich wrote:
> Hi!
>
> I am seeing 100% CPU usage by the Java process when I use the IcedTea plugin + OpenJDK 7 in Firefox
> 22 on Peppermint Linux.
>
> It's not every time. Mostly after I load a few applets, it begins. Applets don't work and CPU usage
> of Java process = 100%.
>
> I also saw this with Java 6 I think. Definitely it's Java 7 now:
>
> ~ $ dpkg -l|grep iced
> ii  icedtea-7-jre-jamvm                  7u25-2.3.10-1ubuntu0.12.04.2              Alternative JVM
> for OpenJDK, using JamVM
> ii  icedtea-7-plugin                     1.2.3-0ubuntu0.12.04.3                    web browser
> plugin based on OpenJDK and IcedTea to execute Java applets
> ii  icedtea-netx                         1.2.3-0ubuntu0.12.04.3                    NetX -
> implementation of the Java Network Launching Protocol (JNLP)
> ii  icedtea-netx-common                  1.2.3-0ubuntu0.12.04.3                    NetX -
> implementation of the Java Network Launching Protocol (JNLP)
>
> What to do...? Any way to find out what the Java process is doing?
>
> I'll try kill -3 to get a stack dump next time the bug is seen. Hope it goes somewhere I can see it.
>
> Note: Sometimes the CPU load seems to go away again by itself, remember seeing that once.
>
> Weird, eh?
>
> Here's an example applet btw: http://tinybrain.de:8080/tb/gui-applet.php?id=105
>
> Any ideas?


Not much to guess I'm afraid :( Do you mind to try with custom build head?
I have tried the exampel link you posted today, and java for very short tiime jumped to 42% but rest 
of time it dropped to vlaues 5% and moreover less..


J.