JMAPÃüÁîÏê½â

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• jmap pid #´òÓ¡ÄÚ´æʹÓõÄÕªÒªÐÅÏ¢
• jmap ¨Cheap pid #java heapÐÅÏ¢
• jmap -histo:live pid #ͳ¼Æ¶ÔÏócount £¬live±íʾÔÚʹÓÃ
• jmap -histo pid >mem.txt #´òÓ¡±È½Ï¼òµ¥µÄ¸÷¸öÓжàÉÙ¸ö¶ÔÏóÕ¼Á˶àÉÙÄÚ´æµÄÐÅÏ¢£¬Ò»°ãÖض¨ÏòµÄÎļþ
• jmap -dump:format=b,file=mem.dat pid #½«ÄÚ´æʹÓõÄÏêϸÇé¿öÊä³öµ½mem.dat Îļþ

ÓÃjhatÃüÁî¿ÉÒԲο´ jhat -port 7000 mem.dat
È»ºóʹÓãºhttp://127.0.0.1:7000/ ²é¿´ÀàÏà¹ØÐÅÏ¢

¸÷¸öclassName

	BaseType Character		Type		Interpretation
	B		byte		signed byte
	C		char		Unicode character
	D		double		double-precision floating-point value
	F		float		single-precision floating-point value
	I		int		integer
	J		long		long integer
	L<classname>;		reference		an instance of class <classname>
	S		short		signed short
	Z		boolean		true or false
	[		reference		one array dimension

²Î¿¼£ºhttp://java.sun.com/docs/books/jvms/second_edition/html/ClassFile.doc.html