1. *NIX TOOLS

2. htop
-------------------------------------------

3. iostat
-------------------------------------------

4. free
-------------------------------------------

5. dstat
-------------------------------------------

6. perf
-------------------------------------------

7. JDK TOOLS

8. jps
-------------------------------------------

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
-------------------------------------------

11. jmap
-------------------------------------------

12. jstat
-------------------------------------------

13. jstack
-------------------------------------------

14. -XX:+PrintFlagsFinal
-------------------------------------------
-XX:+UnlockExperimentalVMOptions -XX:+UnlockDiagnosticVMOptions

15. OBJECT
LAYOUT

16. java-object-layout
-------------------------------------------
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 $FileClass$