This document lists and briefly describes various Linux and Java tools for monitoring systems and debugging applications, including htop for monitoring processes, iostat and free for disk and memory monitoring, perf for performance profiling, jps and jstack for Java process and thread debugging, and java-object-layout for visualizing Java object layouts. Instructions are provided for configuring some of the tools, such as enabling ptrace for jstack and setting JVM flags and java-agent for java-object-layout.

1. *NIX TOOLS

2. htop
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3. iostat
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4. free
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5. dstat
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6. perf
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7. JDK TOOLS

8. jps
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9. jinfo
------------------------------------------sudo sh -c "echo 0 > /proc/sys/kernel/yama/ptrace_scope"
or
in /etc/sysctl.d/10-ptrace.conf set kernel.yama.ptrace_scope = 0

10. jmap
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11. jmap
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12. jstat
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13. jstack
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14. -XX:+PrintFlagsFinal
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-XX:+UnlockExperimentalVMOptions -XX:+UnlockDiagnosticVMOptions

15. OBJECT
LAYOUT

16. java-object-layout
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https://github.com/shipilev/java-object-layout
Setup as external tool in IntelliJ
-cp $Classpath$:MYPATH/java-object-layout.jar -javaagent:MYPATH/java-object-layout.jar
net.shipilev.tools.objectlayout.MainAnalyzer $FileClass$