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jps_stat

A bash script to moniter current_heap_memory , max_heap_till_now , current_ram , max_ram_used , current_cpu_by_jvm details of all java programs running on current linux system.

How to use

  • Clone this repo and extract and open the folder
  • Right click on jpsstat.sh file and select properties
  • Under Permissions tab, check the Allow executing file as program option.
  • Now open this folder in terminal and enter ./jpsstat.sh
  • This will list the current_heap_memory , max_heap_till_now, current_ram_use, max_ram_used and current_cpu_use of all running java processes on your linux system with live refresh.

Options

This tool expects options in ./jpsstat.sh [option] format.

  • -l : use this option to display the full package name for the application's main class or the full path name to the application's JAR file
  • -h : display the help details. You can also use -help

Example: ./jpsstat.sh -l or ./jpsstat.sh -h

How to stop

  • Press ctrl+c to stop the script and enter reset to clear your screen

Output

Script details

  • This uses jps command to get the list of all processes running java programs (jvm instances)
  • Then for each process_id obtained from jps, it runs jstat -gc <process_id>
  • It calculates Heap memory by adding following fields of jstat -gc output -
    • S0U: Survivor space 0 utilization
    • S1U: Survivor space 1 utilization
    • EU : Eden space utilization
    • OU : Old space utilization
  • It tracks cpu uses using ps -p <process_id> -o %cpu command
  • It uses the rss field of the output of /proc/<pid>/statm command to get the memory(RAM) used by the java process.
  • It uses tput cuu <# of lines> to refresh screen
  • All the decimal values in the output is truncated using %.*

Troubleshooting

  1. Getting error as ./jpsstat.sh: 38: ./jpsstat.sh: Syntax error: "(" unexpected
    • Make sure you run the script as ./jpsstat.sh and not as sh ./jpsstat.sh
    • Use bash --version to make sure your bash version is >= 4.0
  2. Getting error as bash: ./jpsstat.sh: Permission denied
    • Make sure you have given the permission to the "jpsstat.sh" file to execute as program.
    • Either use chmod 777 jpsstat.sh command or follow How to use section to give execute permission to script file.

Requirements

  • Jdk
  • Linux System (Tested on Ubuntu 16.04 LTS)
  • Bash version >= 4.0

License

MIT License

Copyright (c) 2017 Amarjeet Anand

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.