What are these objects in the jmap histogram?
17,603
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[C
is achar[]
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[S
is ashort[]
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[I
is aint[]
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[B
is abyte[]
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[[I
is aint[][]
The JavaDoc for Class.getName()
has the details.
Comments
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Chris Steinbach about 2 years
I'm using jmap to get a histogram of the heap. I'm not sure what the objects are that are referred to as "[C", "[S", "[I" and "[B". Anyone know?
$ jmap -histo 3299 num #instances #bytes class name ---------------------------------------------- 1: 9804 19070632 [Ljava.util.HashMap$Entry; 2: 38074 6216960 [Ljava.lang.Object; 3: 62256 4727832 [C 4: 19665 3124744 <constMethodKlass> 5: 19665 2365864 <methodKlass> 6: 57843 2313720 java.lang.String 7: 1662 2060528 <constantPoolKlass> 8: 21121 1842344 [S 9: 37772 1743888 <symbolKlass> 10: 2554 1655632 [I 11: 63710 1529040 java.lang.Integer 12: 1662 1264184 <instanceKlassKlass> 13: 1515 1196224 <constantPoolCacheKlass> 14: 24351 1168848 java.util.HashMap$Entry 15: 18706 1047536 java.net.SocketTimeoutException 16: 4301 784416 [B ... 23: 2588 242616 [[I