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Full Discussion: How to Monitor Tomcat App Server?
Special Forums UNIX and Linux Applications How to Monitor Tomcat App Server? Post 302990377 by agent.kgb on Wednesday 25th of January 2017 02:02:41 PM
Old 01-25-2017
it is usual problem with wrong configured java. Java runs garbage collection regularly and if it has too harsh settings for garbage collection, you will notice a small hang during the process. Check maximum and initial heap size and your garbage collection mechanism. Install some webapp - there some very nice with graphs and a lot of information - to monitor java heap. You will not see much information using standard UNIX toolset.

e.g. Understanding Java Garbage Collection | CUBRID Blog :
Quote:
there is a term that you should know before learning about GC. The term is "stop-the-world." Stop-the-world will occur no matter which GC algorithm you choose. Stop-the-world means that the JVM is stopping the application from running to execute a GC. When stop-the-world occurs, every thread except for the threads needed for the GC will stop their tasks. The interrupted tasks will resume only after the GC task has completed. GC tuning often means reducing this stop-the-world time.
 

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LEARN ABOUT DEBIAN

torrus_monitor

TORRUS_MONITOR(8)						      torrus							 TORRUS_MONITOR(8)

NAME

       monitor - Torrus Monitor.

SYNOPSIS

       torrus monitor --tree=TREENAME [options...]

DESCRIPTION

       This command starts the Monitor process for the tree TREENAME. By default it forks into a daemon, sets the log output file to
       /var/log/torrus/monitor.TREENAME.log, performs one monitoring cycle, and sleeps until the next cycle is scheduled. In daemon mode the log
       file can be reopened by sending it a SIGHUP signal.

OPTIONS

       --nodaemon
	   Prevents the process from becoming a daemon and sets the log to STDERR.

       --runonce
	   Instructs the script to run once and exit. Implies --nodaemon.

       --delay=N
	   Makes the daemon sleep for N minutes before starting the first cycle.  This would happen on the daemon startup and also after each
	   configuration recompilation.  For example, when monitor and collector start simultaneously, the collector needs some time to retrieve
	   the data being monitored.

       --debug
	   Sets the log level to debug.

       --verbose
	   Sets the debug level to info.

       --help
	   Displays a help message.

FILES

       /etc/torrus/conf/torrus-siteconfig.pl
	   Torrus site configuration script.

       /var/log/torrus/monitor.TREENAME.log
	   Monitor's log for the tree TREENAME.

SEE ALSO

       torrus(8)

NOTES

       See more documentation at Torrus home page: http://torrus.org

AUTHOR

       Stanislav Sinyagin <ssinyagin@yahoo.com>

torrus 2.03							    2013-07-26							 TORRUS_MONITOR(8)
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