Helpful JVM CLI Commands

gistfile1.txt

# source - https://stackoverflow.com/a/52897164/1308685
# Get total Java memory usage from PS
ps -eo size,pid,user,command --sort -size | egrep -i "*/bin/java *" | egrep -v grep | awk '{ hr=$1/1024 ; printf("%.2f MB ",hr) } { for ( x=4 ; x<=NF ; x++ ) { printf("%s ",$x) } print "" }' | cut -d "" -f2 | cut -d "-" -f1
# Get heap size in MB
jstat -gc $(ps axf | egrep -i "*/bin/java *" | egrep -v grep | awk '{print $1}') | tail -n 1 | awk '{split($0,a," "); sum=(a[3]+a[4]+a[6]+a[8]+a[10])/1024; printf("%.2f MB\n",sum)}'

# Print Heap information 
jcmd pid GC.heap_info
jcmd pid VM.system_properties
jcmd pid VM.flags

# source - https://stackoverflow.com/a/7448828/1308685
# Find recent modified files
find $1 -type f -print0 | xargs -0 stat --format '%Y :%y %n' | sort -nr | cut -d: -f2- | head