06-29-2007
Tuning Java on LINUX - My syste info
Hi,
I have provided information requested against each query below.
1. what is the total size of physical memory?
=> 4GB
2. what is the size of your swap space?
=> 2GB
3. what is the amount of free memory plus unused swap space when the operating system is just idling?
=> Not sure how would I find that. However, below is info found at header on running "top" command
top - 13:53:56 up 1 day, 2:41, 6 users, load average: 2.95, 2.84, 2.81
Tasks: 121 total, 4 running, 117 sleeping, 0 stopped, 0 zombie
Cpu(s): 33.2% us, 16.6% sy, 0.1% ni, 50.1% id, 0.0% wa, 0.0% hi, 0.0% si
Mem: 4149212k total, 3375016k used, 774196k free, 244924k buffers
Swap: 2097144k total, 0k used, 2097144k free, 2755996k cached
The "free" command yeilds below details on memory usage.
free
total used free shared buffers cached
Mem: 4149212 3374120 775092 0 244844 2755816
-/+ buffers/cache: 373460 3775752
Swap: 2097144 0 2097144
4. what is the maximum you can successfully set it to?
=> Currently I could set upto -Xms2588m -Xmx2588m
Please let me know if you need further information.
Thanks,
Crabbie
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JSVC(1) Apache Commons Daemon project JSVC(1)
NAME
jsvc - application to launch java daemon
SYNOPSIS
jsvc [-jvm JVM name] [-client client JVM] [-server server JVM] [-classpath path] [-cp path] [-java-home directory] [-version] [-help] [-?]
[-nodetach] [-debug] [-check] [-user user] [-wait waittime] [-umask mask] [-stop] [-verbose:class|gc|jni]
[-outfile /full/path/to/file] [-errfile /full/path/to/file] [-pidfile /full/path/to/file] [-Dproperty=value] [-Xoption]
DESCRIPTION
jsvc executes classfile that implements a Daemon interface.
OPTIONS
-jvm JVM name
use a specific Java Virtual Machine.
-client client JVM
use a client Java Virtual Machine.
-server server JVM
use a server Java Virtual Machine.
-cp/ -classpath directory and zip/jar files
set search path for service classes and resouces
-java-home directory
set the path of your JDK or JRE installation (or set the JAVA_HOME environment variable)
-version
show the current Java environment version (to check correctness of -home and -jvm. Implies -nodetach)
-help
show this help page (implies -nodetach)
-nodetach
don't detach from parent process and become a daemon
-debug
verbosely print debugging information
-check
only check service (implies -nodetach)
-stop
stop the service using the file given in the -pidfile option
-wait waittime
wait up to waittime seconds for the service to start waittime should multiple of 10 (min=10)
-umask mask
sets the file mode creation mask
-user user
user used to run the daemon (defaults to current user)
-verbose[:class|gc|jni]
enable verbose output
-outfile /full/path/to/file
Location for output from stdout (defaults to /dev/null). Use the value '&2' to simulate '1>&2', or 'SYSLOG' to send output to the
system log.
-errfile /full/path/to/file
Location for output from stderr (defaults to /dev/null). Use the value '&1' to simulate '2>&1', or 'SYSLOG' to send output to the
system log.
-pidfile /full/path/to/file
Location for output from the file containing the pid of jsvc (defaults to /var/run/jsvc.pid)
-D<name>=<value>
set a Java system property
-X<option>
set Virtual Machine specific option
AUTHOR
JSVC is part of the Apache Commons Daemon project. Authors are Jean-Frederic Clere, Remy Maucherat, Yoav Shapira, Bill Barker, Mladen Turk.
JSVC is released under the Apache License Version 2.0.
Jsvc version 1.0.6 08/17/2012 JSVC(1)