jstack 9638|grep tid|wc -l Count the number of threads of tomcat
jstack 9630 > tomcat.thread print thread stack
jstat -gcutil 9638 1000 gc status
jmap -heap 9638 heap space
jmap -histo 9630 number of objects
jmap -dump:format=b,file=tomcat.dump 9630 dump files everywhere
jhat -J-mx1024m -port 3030 tomcat.dump View dump file
iostat -x 1 View system io status
The top 5 threads of the best cpu of the process
ps H -p 1120 eo tid,time,%cpu | sed '1d' |awk '{print $1,$2,$3}'|sort -rn -k +3|head -n 5