On 30.08.2010 11:47, Honey Bajaj wrote:
Hello,
I have tomcat 5.5.9 running on CentOS 4.8, I have to restart my tomcat instance
every alternate day and after every 2 or 3 restarts I can see a high cpu
utilization (i.e. almost double of the normal) whereas there is no change in
application code and connectivity. The utilization remain high until I restart
tomcat instance, I tried comparing manager/jmxproxy output when things works
fine and when high utilization happens but didn't find any significant
difference which could lead to high processor utilization. Kindly suggest
possible reasons or steps to investigate.
1) Update to a recent version of Tomcat, e.g. 5.5.30 or 6.0.29.
2) Identify the thread numbers of the threads consuming CPU, using "ps"
and the appropriate flags on your platform to list individual
threads/lightweight processes.
3) Take a few consecutive Java thread dumps of the Java process and look
for the stacks of the thread in question. The decimal ID(s) retrieved by
2) are equal to the nid or tid (hexadecimal) in the header lines of each
thread stack.
Regards,
Rainer
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