There are a lot of resource monitoring tools on the internet. On of the most used monitoring tool is nmon. With this tool, you can almost monitoring everything. From CPU, Memory, Disks, Network and even Filesystem can be monitored by nmon.
What is nmon and Java Nmon Analyzer
Nmon is a short for Nigel’s performance Monitor. This tool is used to monitor resources on Linux, Power, x86, x86_64, Mainframe and ARM (Raspberry Pi). There are two mode available of nmon.
1. Online Mode, which used to real-time monitoring.
2. Capture Mode, which the output will saved to a CSV file for later processing.
Java Nmon Analyzer will use nmon output as an input data to be processed. So to use it, we will first need to have nmon installed and working on your system. Let’s start.
Nmon is specializing to monitor and analyzing performance which includes :
- CPU utilization
- CPU Long-term
- Memory usage
- Virtual memory
Nmon is available in binaries file or source code file for those who want to compile it by yourself. Binaries file is available on nmon download page while nmon source code is available in compiling nmon page. At this article is written, the latest version of nmon is 14g.
Method 1 : Using pre-compiled binaries file
- Download nmon_linux_14i.tar.gz
- Extract it
- Go to the folder you extracted
- Choose the appropriate binary file which match your system. For example, if you are using 32-bit version of Ubuntu 13, then you will found a binary file with name nmon_x86_ubuntu13
- To run it, just type ./nmon_x86_ubuntu13
Method 2 : Compile nmon from the source
If you want to compile nmon by yourself, here’s the steps :
- Download the source code file
- Download the makefile
- Rename the source code file to lmon.c . If you download lmon14g.c, then rename it.
- Look at the makefile content and file the directive that matches your platform and Linux release
- Make nmon. For example, if you are using Ubuntu 13.04, then you can type
$ make nmon_x86_ubuntu1304
- Done. Next, you will find a binary file which name nmon_x86_ubuntu1304
- Type ./nmon_x86_ubuntu1304 to run it
If you found about no ncurses.h file, then you need to install ncurses-dev package.
On Debian / Ubuntu based, you can install it using:
$ sudo apt-get install libncurses5-dev
How to Java Nmon Analyzer
Actually we don’t install Java Nmon Analyzer. But we just run it with Java. This tool can be downloaded from Java Nmon Analyzer download page. After you finish download it, here are the steps how to run it.
- Download and install nmon (make sure you have it)
- Make a pipe for nmon
# mkfifo /tmp/nmonnamedpipe
- Run analyzer agent in the target host :
# java -cp nmonanal_0.1.2.jar li.xiang.nmonanalyser.agent.Agent
The li.xiang.nmonanalyser.agent.Agent is a syntax. Don’t change it.
If it success, you will see a message below :
- Run nmon, begin performance capture
# nmon -s 20 -c 360 -F /tmp/nmonnamedpipe
20 second per snapshot, capture 360 snapshots, totally 2 hrs. you can put the command in crontab for long time data capture.
If it success, you will see an IP Address connected. See below :
- Run Java Nmon Analyzer GUI
# java -jar nmonanal_0.1.2.jar
A pop-up window name System Performance Monitor for LINUX & AIX will show. Then you need to load the data.
- Click Data Loader > From Agent. Then enter target IP Address and its port. By default, it will use 8187 port number
- Click OK
- Wait for couple seconds and the GUI start showing you the result
You can also choose to display the output within specific time range. The available time range are :
- 1 minutes
- 5 minutes
- 10 minutes
- 30 minutes
- 1 hours
- 2 hours
- 3 hours
- 6 hours
- 12 hours
- 1 day
- 2 day
With Java Nmon Analyzer, we can graph nmon output to make it easier to read. This application also easy to use because we don’t need to install it and it have simple menus to understand.