错误场景
今天使用jmap -heap命令查看堆的详细信息报错。
[root@instance-2gak1pfv debuginfo]# java -version
openjdk version "1.8.0_191"
OpenJDK Runtime Environment (build 1.8.0_191-b12)
OpenJDK 64-Bit Server VM (build 25.191-b12, mixed mode)
[root@instance-2gak1pfv debuginfo]# jps -l
110386 org.apache.zookeeper.server.quorum.QuorumPeerMain
40565 sun.tools.jps.Jps
[root@instance-2gak1pfv debuginfo]# jmap -heap 110386
Attaching to process ID 110386, please wait...
Debugger attached successfully.
Server compiler detected.
JVM version is 25.191-b12
using thread-local object allocation.
Mark Sweep Compact GC
Heap Configuration:
MinHeapFreeRatio = 40
MaxHeapFreeRatio = 70
MaxHeapSize = 255852544 (244.0MB)
NewSize = 5570560 (5.3125MB)
MaxNewSize = 85262336 (81.3125MB)
OldSize = 11206656 (10.6875MB)
NewRatio = 2
SurvivorRatio = 8
MetaspaceSize = 21807104 (20.796875MB)
CompressedClassSpaceSize = 1073741824 (1024.0MB)
MaxMetaspaceSize = 17592186044415 MB
G1HeapRegionSize = 0 (0.0MB)
Heap Usage:
Exception in thread "main" java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sun.tools.jmap.JMap.runTool(JMap.java:201)
at sun.tools.jmap.JMap.main(JMap.java:130)
Caused by: java.lang.RuntimeException: unknown CollectedHeap type : class sun.jvm.hotspot.gc_interface.CollectedHeap
at sun.jvm.hotspot.tools.HeapSummary.run(HeapSummary.java:157)
at sun.jvm.hotspot.tools.Tool.startInternal(Tool.java:260)
at sun.jvm.hotspot.tools.Tool.start(Tool.java:223)
at sun.jvm.hotspot.tools.Tool.execute(Tool.java:118)
at sun.jvm.hotspot.tools.HeapSummary.main(HeapSummary.java:50)
... 6 more
解决办法:
安装debuginfo,去网站http://debuginfo.centos.org/7/x86_64里面找匹配当前的openjdk的版本,小版本号也要匹配上。然后使用wget命令下载
wget http://debuginfo.centos.org/7/x86_64/java-1.8.0-openjdk-debuginfo-1.8.0.191.b12-1.el7_6.x86_64.rpm
使用rpm命令安装
rpm -ivh java-1.8.0-openjdk-debuginfo-1.8.0.191.b12-1.el7_6.x86_64.rpm
然后查看是否安装了debuginfo
[root@izuf6ea4rfo45y44oj74jhz logs]# rpm -qa|grep debuginfo
java-1.8.0-openjdk-debuginfo-1.8.0.191.b12-1.el7_6.x86_64
执行jmap -heap命令查看堆详细信息
[root@izuf6ea4rfo45y44oj74jhz logs]# jmap -heap 1421
Attaching to process ID 1421, please wait...
Debugger attached successfully.
Server compiler detected.
JVM version is 25.191-b12
using thread-local object allocation.
Mark Sweep Compact GC
Heap Configuration:
MinHeapFreeRatio = 40
MaxHeapFreeRatio = 70
MaxHeapSize = 482344960 (460.0MB)
NewSize = 10485760 (10.0MB)
MaxNewSize = 160759808 (153.3125MB)
OldSize = 20971520 (20.0MB)
NewRatio = 2
SurvivorRatio = 8
MetaspaceSize = 21807104 (20.796875MB)
CompressedClassSpaceSize = 1073741824 (1024.0MB)
MaxMetaspaceSize = 17592186044415 MB
G1HeapRegionSize = 0 (0.0MB)
Heap Usage:
New Generation (Eden + 1 Survivor Space):
capacity = 48758784 (46.5MB)
used = 42933176 (40.94426727294922MB)
free = 5825608 (5.555732727050781MB)
88.05218768376176% used
Eden Space:
capacity = 43384832 (41.375MB)
used = 42933176 (40.94426727294922MB)
free = 451656 (0.43073272705078125MB)
98.95895413401624% used
From Space:
capacity = 5373952 (5.125MB)
used = 0 (0.0MB)
free = 5373952 (5.125MB)
0.0% used
To Space:
capacity = 5373952 (5.125MB)
used = 0 (0.0MB)
free = 5373952 (5.125MB)
0.0% used
tenured generation:
capacity = 108146688 (103.13671875MB)
used = 64887344 (61.88139343261719MB)
free = 43259344 (41.25532531738281MB)
59.99938158069159% used
21962 interned Strings occupying 2552376 bytes.
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