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Ubuntu11.10下解决 jmap等jdk工具attach pid错误

2012-02-27 21:40 465 查看
1.错误案例
nathan@ubuntu:~/Downloads$ jmap -heap 3991
Attaching to process ID 3991, please wait...
Error attaching to process: sun.jvm.hotspot.debugger.DebuggerException: Can't attach to the process
2.解决方案1）修改/etc/sysctl.d/10-ptrace.conf文件如下：
< kernel.yama.ptrace_scope = 1
---
> kernel.yama.ptrace_scope = 0
（即将1改成0）
2）重启
3.成功
nathan@ubuntu:~$ jmap -heap 1835Attaching to process ID 1835, please wait...Debugger attached successfully.Client compiler detected.JVM version is 20.0-b11using thread-local object allocation.Mark Sweep Compact GCHeap Configuration:MinHeapFreeRatio = 40MaxHeapFreeRatio = 70MaxHeapSize      = 402653184 (384.0MB)NewSize          = 1048576 (1.0MB)MaxNewSize       = 4294901760 (4095.9375MB)OldSize          = 4194304 (4.0MB)NewRatio         = 2SurvivorRatio    = 8PermSize         = 12582912 (12.0MB)MaxPermSize      = 268435456 (256.0MB)Heap Usage:New Generation (Eden + 1 Survivor Space):capacity = 13697024 (13.0625MB)used     = 6592008 (6.286628723144531MB)free     = 7105016 (6.775871276855469MB)48.12730122981459% usedEden Space:capacity = 12189696 (11.625MB)used     = 6592008 (6.286628723144531MB)free     = 5597688 (5.338371276855469MB)54.07852665070565% usedFrom Space:capacity = 1507328 (1.4375MB)used     = 0 (0.0MB)free     = 1507328 (1.4375MB)0.0% usedTo Space:capacity = 1507328 (1.4375MB)used     = 0 (0.0MB)free     = 1507328 (1.4375MB)0.0% usedtenured generation:capacity = 30273536 (28.87109375MB)used     = 18162752 (17.32135009765625MB)free     = 12110784 (11.54974365234375MB)59.995475916655394% usedPerm Generation:capacity = 38273024 (36.5MB)used     = 38107752 (36.342384338378906MB)free     = 165272 (0.15761566162109375MB)99.56817626953125% used
4.参考http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7050524[/code]

                                            

                                        

                        
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