[Shell] 監控JVM使用狀態

為了測試目前記憶體佔用的狀態所寫的shell。

cosa-memory.sh

#!/bin/sh

#author: ken tsai
#date: 2013/7/11

TOMCAT_PID=$(ps aux | grep /bin/java |grep -v grep | grep 'logging' |awk '{print $2}') 

echo "tomcat pid :$TOMCAT_PID"
echo "######################memory monitor##################"
jstat -gcutil -h 10 $TOMCAT_PID 1000

-gcutil Option

Summary of Garbage Collection Statistics

列名	描述
S0	survivor 0区利用率。 Survivor space 0 utilization as a percentage of the space’s current capacity.
S1	survivor 1区利用率。 Survivor space 1 utilization as a percentage of the space’s current capacity.
E	eden区利用率。 Eden space utilization as a percentage of the space’s current capacity.
O	年老代空间利用率。 Old space utilization as a percentage of the space’s current capacity.
P	永生代空间利用率。Permanent space utilization as a percentage of the space’s current capacity.
YGC	young gc次数。 Number of young generation GC events.
YGCT	young gc耗时。 Young generation garbage collection time.
FGC	full gc次数。 Number of full GC events.
FGCT	full gc耗时。 Full garbage collection time.
GCT	GC总耗时。 Total garbage collection time.

參考資料
http://itzoo.info/?p=256