Just an addition to one of Mark's questions:
Am 17.01.2018 um 22:20 schrieb Mark Thomas:
Is it always the same threads generating the load or does it move
between threads?
Just in case Andreas is not aware: one can check with "top -H -p <PID>".
Using -H lets top show one line per thread instead of one line per
process. That way you can easily see CPU use per thread. The "-p <PID>"
would simply filter to only show the threads in your java process (by
using for <PID> the process ID of your Tomcat java process).
Furthermore the PID column in "top -H" does not actually show the PID,
but instead the thread IDs. If you convert that decimal numbers to hex,
e.g. using the shell commandline
printf "0x%x\n" <ID>
(and replacing <ID> by the respective thread id of the lines that show
high CPU usage), you get a hex number that will point you to the
respective thread in the java thread dump by looking for tid=0x... in
the thread header lines. The association between operating system thread
number as shown in "top -H" and the tid in the Java thread dump does is
stable during the lifetime of the process.
Regards,
Rainer
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