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UNIX and Linux Applications

How to Monitor Tomcat App Server?

 
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Special Forums UNIX and Linux Applications How to Monitor Tomcat App Server?
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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 OPENSOLARIS

shutdown

shutdown(1B)					     SunOS/BSD Compatibility Package Commands					      shutdown(1B)

NAME

       shutdown - close down the system at a given time

SYNOPSIS

       /usr/ucb/shutdown [-fhknr] time [warning-message]...

DESCRIPTION

       shutdown  provides  an  automated procedure to notify users when the system is to be shut down. time specifies when shutdown will bring the
       system down; it may be the word now (indicating an immediate shutdown), or it may specify a future time in one of two formats: +number  and
       hour:min.  The  first  form brings the system down in number minutes, and the second brings the system down at the time of day indicated in
       24-hour notation.

       At intervals that get closer as the apocalypse approaches, warning messages are displayed at terminals of all logged-in users, and of users
       who have remote mounts on that machine.

       At  shutdown  time a message is written to the system log daemon, syslogd(1M), containing the time of shutdown, the instigator of the shut-
       down, and the reason. Then a terminate signal is sent to init, which brings the system down to single-user mode.

OPTIONS

       As an alternative to the above procedure, these options can be specified:

       -f    Arrange, in the manner of fastboot(1B), that when the system is rebooted, the file systems will not be checked.

       -h    Execute halt(1M).

       -k    Simulate shutdown of the system. Do not actually shut down the system.

       -n    Prevent the normal sync(2) before stopping.

       -r    Execute reboot(1M).

FILES

       /etc/rmtab    remote mounted file system table

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWscpu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       fastboot(1B), login(1), halt(1M), reboot(1M), syslogd(1M), sync(2), rmtab(4), attributes(5)

NOTES

       Only allows you to bring the system down between now and 23:59 if you use the absolute time for shutdown.

SunOS 5.11							    11 Oct 1994 						      shutdown(1B)