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Jul 19, 2012

README.md

TBJMap

JMap Enhanced Edition

基于Serviceability Agent,对JMap做了增强,可以方便的输出JVM堆中,每一个分区的对象实例个数和大小的Histogram图

使用方法:

java -classpath /home/admin/tbjmap.jar:/java/lib/sa-jdi.jar sun.jvm.hotspot.tools.TBJMap -histo PID > jmap_output.log java -classpath /home/admin/tbjmap.jar:/java/lib/sa-jdi.jar sun.jvm.hotspot.tools.TBJMap -oldhisto PID > jmap_oldoutput.log java -classpath /home/admin/tbjmap.jar:/java/lib/sa-jdi.jar sun.jvm.hotspot.tools.TBJMap -permhisto PID > jmap_permoutput.log

java -classpath /home/admin/tbjmap.jar:/java/lib/sa-jdi.jar sun.jvm.hotspot.tools.TBDumpClassURL PID > class_url.log

java -classpath /home/admin/tbjmap.jar:/java/lib/sa-jdi.jar sun.jvm.hotspot.tools.TBDirectMemorySize PID

执行完毕会输出如下的信息:

Old Object Histogram:

num all instances/bytes old instances/bytes Class description

1: 1831111/70874072 1798386/68395648 char[]

2: 1871467/59886944 1840369/58891808 java.lang.String

3: 1224464/39182848 1224384/39180288 java.util.HashMap$Entry

4: 188390/26556456 188317/26547800 java.util.HashMap$Entry[]

5: 395298/25299072 395298/25299072 forest.dataobject.impl.DefaultPropertyValueDO

6: 1046319/25111656 1046181/25108344 java.lang.Long

7: 332206/23910336 329739/23821816 java.lang.Object[]

8: 117127/19404056 88705/15361808 long[]

9: 147064/17362472 134052/15619640 byte[]

10: 156284/17022448 136050/15396256 int[]

11: 412608/16504320 412402/16496080 java.util.LinkedHashMap$Entry

12: 325472/10415104 325472/10415104 forest.dataobject.impl.DefaultValueDO

13: 304452/9742464 304452/9742464 forest.dataobject.impl.FeatureDO

14: 190344/9136512 190344/9136512 forest.dataobject.impl.IntegerMapSupportArrayList

15: 188028/9025344 187971/9022608 java.util.HashMap

16: 88013/7041040 88013/7041040 forest.dataobject.impl.FileStdCategoryPropertyDO

线上使用建议先offline应用

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