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使用jmap -histo[:live] pid查看堆内存中的对象数目、大小统计直方图，如果带上live则只统计活对象，如下：
- root@ubuntu:/# jmap -histo:live 21711 | more
- num #instances #bytes class name----------------------------------------------
- 1: 38445 5597736 <constMethodKlass>
- 2: 38445 5237288 <methodKlass>
- 3: 3500 3749504 <constantPoolKlass>
- 4: 60858 3242600 <symbolKlass>
- 5: 3500 2715264 <instanceKlassKlass>
- 6: 2796 2131424 <constantPoolCacheKlass>
- 7: 5543 1317400 [I
- 8: 13714 1010768 [C
- 9: 4752 1003344 [B
- 10: 1225 639656 <methodDataKlass>
- 11: 14194 454208 java.lang.String
- 12: 3809 396136 java.lang.Class
- 13: 4979 311952 [S
- 14: 5598 287064 [[I
- 15: 3028 266464 java.lang.reflect.Method
- 16: 280 163520 <objArrayKlassKlass>
- 17: 4355 139360 java.util.HashMap$Entry
- 18: 1869 138568 [Ljava.util.HashMap$Entry;
- 19: 2443 97720 java.util.LinkedHashMap$Entry
- 20: 2072 82880 java.lang.ref.SoftReference
- 21: 1807 71528 [Ljava.lang.Object;
- 22: 2206 70592 java.lang.ref.WeakReference
- 23: 934 52304 java.util.LinkedHashMap
- 24: 871 48776 java.beans.MethodDescriptor
- 25: 1442 46144 java.util.concurrent.ConcurrentHashMap$HashEntry
- 26: 804 38592 java.util.HashMap
- 27: 948 37920 java.util.concurrent.ConcurrentHashMap$Segment
- 28: 1621 35696 [Ljava.lang.Class;
- 29: 1313 34880 [Ljava.lang.String;
- 30: 1396 33504 java.util.LinkedList$Entry
- 31: 462 33264 java.lang.reflect.Field
- 32: 1024 32768 java.util.Hashtable$Entry
- 33: 948 31440 [Ljava.util.concurrent.ConcurrentHashMap$HashEntry;
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