jmap

Java memory map tool. More information: <https://docs.oracle.com/en/java/javase/20/docs/specs/man/jmap.html>.

Install

All systems
curl cmd.cat/jmap.sh
Debian Debian
apt-get install openjdk-12-jdk-headless
Ubuntu
apt-get install openjdk-12-jdk-headless
Arch Arch Linux
pacman -S java-environment-common
image/svg+xml Kali Linux
apt-get install openjdk-11-jdk-headless
Fedora
dnf install java-9-openjdk-devel-debug-1
Windows (WSL2)
sudo apt-get update sudo apt-get install openjdk-12-jdk-headless
Raspbian
apt-get install openjdk-8-jdk
Dockerfile
dockerfile.run/jmap

Java memory map tool. More information: <https://docs.oracle.com/en/java/javase/20/docs/specs/man/jmap.html>.

  • Print shared object mappings for a Java process (output like pmap):
    jmap java_pid
  • Print heap summary information:
    jmap -heap filename.jar java_pid
  • Print histogram of heap usage by type:
    jmap -histo java_pid
  • Dump contents of the heap into a binary file for analysis with jhat:
    jmap -dump:format=b,file=path/to/file java_pid
  • Dump live objects of the heap into a binary file for analysis with jhat:
    jmap -dump:live,format=b,file=path/to/file java_pid

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