解决JMap抓取heap使用统计信息报错的问题

如下所示：

******************************
/jmap jdk small version diffrent from jvm jdk vesionbegin///
[dev@iz2ze8us9p89pfk02m9vs1z ~]$ jmap -heap 1541
attaching to process id 1541, please wait...
error attaching to process: sun.jvm.hotspot.debugger.debuggerexception: cannot open binary file
sun.jvm.hotspot.debugger.debuggerexception: sun.jvm.hotspot.debugger.debuggerexception: cannot open binary file
at sun.jvm.hotspot.debugger.linux.linuxdebuggerlocal$linuxdebuggerlocalworkerthread.execute(linuxdebuggerlocal.java:163)
at sun.jvm.hotspot.debugger.linux.linuxdebuggerlocal.attach(linuxdebuggerlocal.java:278)
at sun.jvm.hotspot.hotspotagent.attachdebugger(hotspotagent.java:671)
at sun.jvm.hotspot.hotspotagent.setupdebuggerlinux(hotspotagent.java:611)
at sun.jvm.hotspot.hotspotagent.setupdebugger(hotspotagent.java:337)
at sun.jvm.hotspot.hotspotagent.go(hotspotagent.java:304)
at sun.jvm.hotspot.hotspotagent.attach(hotspotagent.java:140)
at sun.jvm.hotspot.tools.tool.start(tool.java:185)
at sun.jvm.hotspot.tools.tool.execute(tool.java:118)
at sun.jvm.hotspot.tools.heapsummary.main(heapsummary.java:49)
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: sun.jvm.hotspot.debugger.debuggerexception: cannot open binary file
at sun.jvm.hotspot.debugger.linux.linuxdebuggerlocal.attach0(native method)
at sun.jvm.hotspot.debugger.linux.linuxdebuggerlocal.access$100(linuxdebuggerlocal.java:62)
at sun.jvm.hotspot.debugger.linux.linuxdebuggerlocal$1attachtask.doit(linuxdebuggerlocal.java:269)
at sun.jvm.hotspot.debugger.linux.linuxdebuggerlocal$linuxdebuggerlocalworkerthread.run(linuxdebuggerlocal.java:138)
/jmap jdk small version diffrent from jvm jdk vesionend///

/jmap jdk big version diffrent from jvm jdk vesionbegin///
attaching to process id 30413, please wait...
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.internalerror: void* type hasn't been seen when parsing int*
at sun.jvm.hotspot.hotspottypedatabase.recursivecreatebasicpointertype(hotspottypedatabase.java:721)
at sun.jvm.hotspot.hotspottypedatabase.lookuptype(hotspottypedatabase.java:134)
at sun.jvm.hotspot.hotspottypedatabase.lookuporcreateclass(hotspottypedatabase.java:631)
at sun.jvm.hotspot.hotspottypedatabase.createtype(hotspottypedatabase.java:751)
at sun.jvm.hotspot.hotspottypedatabase.readvmtypes(hotspottypedatabase.java:195)
at sun.jvm.hotspot.hotspottypedatabase.<init>(hotspottypedatabase.java:89)
at sun.jvm.hotspot.hotspotagent.setupvm(hotspotagent.java:395)
at sun.jvm.hotspot.hotspotagent.go(hotspotagent.java:305)
at sun.jvm.hotspot.hotspotagent.attach(hotspotagent.java:140)
at sun.jvm.hotspot.tools.tool.start(tool.java:185)
at sun.jvm.hotspot.tools.tool.execute(tool.java:118)
at sun.jvm.hotspot.tools.heapsummary.main(heapsummary.java:49)
... 6 more
/jmap jdk big version diffrent from jvm jdk vesionend///
****************************************

【问题】

执行jmap -heap命令是报错，方法返回参数类型不匹配

【分析】

考虑执行jmap的jdk版本同目标jvm的jdk版本不一致：

1> 如果jmap的jdk版本比目标jvm高，执行会提示方法不兼容错误

2> 如果jmap的jdk版本比目标jvm低，执行会提示jdk版本不一致错误

【解决】

采用执行jmap的jdk版本同目标jvm的jdk版本保持一致。

补充知识：jmap -heap返回结果分析

using parallel threads in the new generation.
using thread-local object allocation.
concurrent mark-sweep gc
heap configuration:
 minheapfreeratio   = 40
 maxheapfreeratio   = 70
 maxheapsize    = 4294967296 (4096.0mb)
 newsize     = 858980352 (819.1875mb)
 maxnewsize    = 858980352 (819.1875mb)
 oldsize     = 3435986944 (3276.8125mb)
 newratio     = 4
 survivorratio   = 8
 metaspacesize   = 21807104 (20.796875mb)
 compressedclassspacesize = 1073741824 (1024.0mb)
 maxmetaspacesize   = 17592186044415 mb
 g1heapregionsize   = 0 (0.0mb)

heap usage:

新生代

new generation (eden + 1 survivor space):
 capacity = 773128192 (737.3125mb)
 used  = 95478696 (91.05558013916016mb)
 free  = 677649496 (646.2569198608398mb)
 12.349659084738175% used
eden space:
 capacity = 687276032 (655.4375mb)
 used  = 95478696 (91.05558013916016mb)
 free  = 591797336 (564.3819198608398mb)
 13.892336056322709% used
from space:
 capacity = 85852160 (81.875mb)
 used  = 0 (0.0mb)
 free  = 85852160 (81.875mb)
 0.0% used
to space:
 capacity = 85852160 (81.875mb)
 used  = 0 (0.0mb)
 free  = 85852160 (81.875mb)
 0.0% used
concurrent mark-sweep generation:
 capacity = 3435986944 (3276.8125mb)
 used  = 119572370833685648 (1.1403309901588979e11mb)
 free  = 17478152948676 mb
 3.480000732903997e9% used

根据以上数据，我们来check一些ratio：

newratio = 2
eden space capacity = 1063256064 (1014.0mb)
from space capacity = 4718592 (4.5mb)
to space capacity = 5242880 (5.0mb)

简单加法，

new size=1014.0+4.5+5.0=1023.5mb

maxheapsize = 3221225472 (3072.0mb)

年轻代占比：

1023.5/3072.0=1/3。

换算newratio的计算，老年代/新生代，结果为2

以上这篇解决jmap抓取heap使用统计信息报错的问题就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持。