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High CPU usage and multiple jobs created while streaming data via a java applet from a secure/certified website. CPU usage is normal for a few minutes then suddenly jobs multiply and CPU usage climbs on one of the jobs.
Jobs with the following command begin to multiply in my job queue with one job showing CPU usage at 368% and staying resident in memory (yeah, a long one):
/usr/lib/jvm/java-7-openjdk/jre/bin/java -Xbootclasspath/a:/usr/share/icedtea-web/netx.jar:/usr/share/icedtea-web/plugin.jar:/usr/share/java/js.jar: -classpath /usr/lib/jvm/java-7-openjdk/jre/lib/rt.jar sun.applet.PluginMain /run/user/1000/icedteaplugin-tbattist-SZ3xKO/7160-icedteanp-plugin-to-appletviewer /run/user/1000/icedteaplugin-tbattist-SZ3xKO/7160-icedteanp-appletviewer-to-plugin /run/user/1000/icedteaplugin-tbattist-SZ3xKO/7160-icedteanp-plugin-debug-to-appletviewerI have the following java packages installed on my system:
local/icedtea-web-java7 1.5-1
local/jdk7-openjdk 7.u51_2.4.6-1
local/jre7-openjdk 7.u51_2.4.6-1
local/jre7-openjdk-headless 7.u51_2.4.6-1I also get the following message in my system log when starting to stream:
Apr 11 12:26:18 saturn logger[7872]: IcedTea-Web java error manual log:
Apr 11 12:26:18 saturn logger[7873]: Application title was not found in manifest. Check with application vendor
Apr 11 12:26:37 saturn logger[7883]: IcedTea-Web java error - for more info see itweb-settings debug options or console. See http://icedtea.classpath.org/wiki/IcedTea-Web#Filing_bugs for help.
Anybody having this issue or clue on what to do? I am wondering if recent changes to openssl (heartbleed) might have java change ramifications? Should I submit bug to Icedtea?
FYI - My system:
Processor : 4x AMD A8-3870 APU with Radeon(tm) HD Graphics
Memory : 7646MB (2518MB used)
Operating System : Arch Linux 3.14.0-4
OpenGL Renderer : Gallium 0.4 on AMD SUMO
X11 Vendor : The X.Org FoundationOffline
Additional info:
Browser is Chromium.
If anything, can someone explain why a java program would create multiple job copies? It is like the captain is calling for more troops to fight an escalating battle, but all I see is a fist fight between two people.
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...further research and learning.
Here is a good tutorial on Java. Evidently, what I called "jobs" is referred to as processes and threads in this tutorial. The tutorial states that multithreaded execution is an essential feature of the Java platform which explains the avalanche of threads I observe. However, I am still stumped at what causes the avalanche of threads and excessive CPU consumption for such a mediocre task. Also the system log says that IcedTea has an error stating "Application title was not found in manifest. Check with application vendor". I interpret this to mean that IcedTea does not recognized some application. What application? .....the applet?
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