JAVA common performance diagnostic tools

JAVA6 diagnostic tools and options configuration http://www.oracle.com/technetwork/java/javase/tools-141261.html#gbmnr
JDK comes with performance testing related tools
   jconsole provides memory, threads, number of classes, CPU diagram, The description is more abstract
   jmap jmap -dump:format=b,file=mems.dat 4992 provides the HEAP dump file
   jhat jhat -J-Xmx1024m -port 7000 mems.dat opens the socket port, analyzes the HEAP dump in the WEB way, and also provides the class Reference relationship
   jps View the JAVA process, mainly to obtain the PID
   jvisualvm jconsole upgraded version, providing a more user-friendly graphic
Eclipse MAT
oracle JRocket