64位windows作業系統下盡量不要使用32位JDK

新產品發布，拿來試用。由於本機是win7_x64，但是為方便工作，機器安裝了從32位的JDK1.5一直到64位的JDK1.6的4個JDK。為保證運行時能與大多數人的健全狀態相同，依然採用了32位的jdk1.6來運行產品。

結果，我第一次碰到應用伺服器剛起來就crash的問題。

產生的JVM的錯誤記錄檔如下：

## There is insufficient memory for the Java Runtime Environment to continue.# Native memory allocation (malloc) failed to allocate 678096 bytes for Chunk::new# Possible reasons:#   The system is out of physical RAM or swap space#   In 32 bit mode, the process size limit was hit# Possible solutions:#   Reduce memory load on the system#   Increase physical memory or swap space#   Check if swap backing store is full#   Use 64 bit Java on a 64 bit OS#   Decrease Java heap size (-Xmx/-Xms)#   Decrease number of Java threads#   Decrease Java thread stack sizes (-Xss)#   Set larger code cache with -XX:ReservedCodeCacheSize=# This output file may be truncated or incomplete.##  Out of Memory Error (allocation.cpp:317), pid=2468, tid=2708## JRE version: 6.0_31-b05# Java VM: Java HotSpot(TM) Server VM (20.6-b01 mixed mode windows-x86 )---------------  T H R E A D  ---------------Current thread (0x05f65c00):  JavaThread "C2 CompilerThread1" daemon [_thread_in_native, id=2708, stack(0x06320000,0x06370000)]Stack: [0x06320000,0x06370000],  sp=0x0636e594,  free space=313kNative frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)[error occurred during error reporting (printing native stack), id 0xc0000005]Current CompileTask:C2:  66818 1186      com.sun.corba.se.impl.corba.TypeCodeImpl.read_value_body(Lorg/omg/CORBA_2_3/portable/InputStream;)V (1274 bytes)---------------  P R O C E S S  ---------------Java Threads: ( => current thread )  0x08447000 JavaThread "Idle HTTPHandler-4" [_thread_blocked, id=7344, stack(0x0e320000,0x0e370000)]  0x08446800 JavaThread "Idle HTTPHandler-3" [_thread_blocked, id=4148, stack(0x0e290000,0x0e2e0000)]  0x08446000 JavaThread "Idle HTTPHandler-2" [_thread_blocked, id=5736, stack(0x0e200000,0x0e250000)]  0x08445c00 JavaThread "Idle ORBWorker-3" [_thread_blocked, id=6876, stack(0x0c460000,0x0c4b0000)]  0x08445400 JavaThread "Running ORBWorker-2" [_thread_in_vm, id=6612, stack(0x0c330000,0x0c380000)]  0x08445000 JavaThread "AS-Monitor Sampling Thread: ThreadMonitor" [_thread_blocked, id=7820, stack(0x0c290000,0x0c2e0000)]  0x08444800 JavaThread "AS-Monitor Sampling Thread: HttpConnectionMonitor" [_thread_blocked, id=7688, stack(0x0c200000,0x0c250000)]  0x06fb3c00 JavaThread "AS-Monitor Sampling Thread: DataSourcesMonitor" [_thread_blocked, id=1448, stack(0x0c170000,0x0c1c0000)]  0x07ffac00 JavaThread "AS-Monitor Sampling Thread: SessionsMonitor" [_thread_blocked, id=6160, stack(0x0c0e0000,0x0c130000)]  0x07ffa400 JavaThread "AS-Monitor Sampling Thread: JTAMonitor" [_thread_blocked, id=6844, stack(0x0c050000,0x0c0a0000)]  0x07ffa000 JavaThread "AS-Monitor Sampling Thread: ClassLoadMonitor" [_thread_blocked, id=7148, stack(0x0bfc0000,0x0c010000)]  0x07ff9800 JavaThread "AS-Monitor Sampling Thread: MemoryMonitor" [_thread_blocked, id=7428, stack(0x0bf30000,0x0bf80000)]  0x07ff9000 JavaThread "p: default-threadpool; w: Idle" daemon [_thread_blocked, id=4840, stack(0x0b4e0000,0x0b530000)]  0x07ff8c00 JavaThread "p: default-threadpool; w: Idle" daemon [_thread_blocked, id=6512, stack(0x0b440000,0x0b490000)]  0x07ff8400 JavaThread "Thread-19" daemon [_thread_blocked, id=7412, stack(0x0b230000,0x0b280000)]  0x07ff8000 JavaThread "JMX server connection timeout 64" daemon [_thread_blocked, id=2176, stack(0x0b180000,0x0b1d0000)]  0x07ff7800 JavaThread "p: default-threadpool; w: Idle" daemon [_thread_blocked, id=7128, stack(0x0b010000,0x0b060000)]  0x07ff7400 JavaThread "Idle ORBWorker-1" [_thread_blocked, id=7976, stack(0x0af60000,0x0afb0000)]  0x06fb4800 JavaThread "SelectorThread" daemon [_thread_in_native, id=3124, stack(0x0aec0000,0x0af10000)]  0x06fb4000 JavaThread "SelectorThread" daemon [_thread_in_native, id=2704, stack(0x0ae10000,0x0ae60000)]  0x06fb3400 JavaThread "pool-2-thread-1" [_thread_blocked, id=8036, stack(0x0a910000,0x0a960000)]  0x06fb2c00 JavaThread "Idle HTTPHandler-1" [_thread_blocked, id=6600, stack(0x0a7d0000,0x0a820000)]  0x06fb2800 JavaThread "HttpReader" [_thread_in_native, id=5532, stack(0x0a740000,0x0a790000)]  0x06fb2000 JavaThread "MuxReader" [_thread_in_native, id=6712, stack(0x0a6b0000,0x0a700000)]  0x06fb1c00 JavaThread "AutoDeployer" [_thread_blocked, id=6732, stack(0x0a1d0000,0x0a220000)]  0x06fb1400 JavaThread "MongoCleaner22152612" daemon [_thread_blocked, id=4764, stack(0x0a140000,0x0a190000)]  0x06fb1000 JavaThread "derby.rawStoreDaemon" daemon [_thread_blocked, id=8008, stack(0x0a0a0000,0x0a0f0000)]  0x06cfc000 JavaThread "Timer-2" daemon [_thread_blocked, id=6484, stack(0x09fe0000,0x0a030000)]  0x06cf8000 JavaThread "derby.antiGC" daemon [_thread_blocked, id=3232, stack(0x08fd0000,0x09020000)]  0x06cfb800 JavaThread "RMI TCP Connection(idle)" daemon [_thread_blocked, id=2936, stack(0x09ba0000,0x09bf0000)]  0x06cfb400 JavaThread "RMI TCP Connection(4)-192.168.0.70" daemon [_thread_blocked, id=7516, stack(0x095f0000,0x09640000)]  0x06cfac00 JavaThread "RMI TCP Connection(idle)" daemon [_thread_blocked, id=5808, stack(0x094d0000,0x09520000)]  0x06cfa800 JavaThread "RMI TCP Connection(2)-192.168.0.70" daemon [_thread_in_native, id=5784, stack(0x09430000,0x09480000)]  0x06cfa000 JavaThread "JMX server connection timeout 41" daemon [_thread_blocked, id=6264, stack(0x09320000,0x09370000)]  0x06cf9c00 JavaThread "RMI Scheduler(0)" daemon [_thread_blocked, id=8124, stack(0x09290000,0x092e0000)]  0x06cf9400 JavaThread "RMI TCP Connection(1)-192.168.0.70" daemon [_thread_in_native, id=8160, stack(0x09200000,0x09250000)]  0x06cf8800 JavaThread "RMI TCP Accept-0" daemon [_thread_in_native, id=6096, stack(0x091b0000,0x09200000)]  0x06cf7c00 JavaThread "derby.rawStoreDaemon" daemon [_thread_blocked, id=1388, stack(0x08f40000,0x08f90000)]  0x06cf7400 JavaThread "Timer-1" daemon [_thread_blocked, id=3912, stack(0x08eb0000,0x08f00000)]  0x06cf7000 JavaThread "derby.antiGC" daemon [_thread_blocked, id=6244, stack(0x08e20000,0x08e70000)]  0x06cf6000 JavaThread "Idle JMSHandler-4" [_thread_blocked, id=6420, stack(0x07dc0000,0x07e10000)]  0x06cf5c00 JavaThread "Idle JMSHandler-3" [_thread_blocked, id=7960, stack(0x07d30000,0x07d80000)]  0x06cf5400 JavaThread "Idle JMSHandler-2" [_thread_blocked, id=2436, stack(0x07ca0000,0x07cf0000)]  0x06cf5000 JavaThread "pool-1-thread-5" [_thread_blocked, id=5680, stack(0x07c10000,0x07c60000)]  0x06cf4800 JavaThread "JMSReader" [_thread_in_native, id=5280, stack(0x07b80000,0x07bd0000)]  0x06d50000 JavaThread "pool-1-thread-4" [_thread_blocked, id=5472, stack(0x07af0000,0x07b40000)]  0x06c2bc00 JavaThread "Timer-0" [_thread_blocked, id=5444, stack(0x07a60000,0x07ab0000)]  0x06c2b800 JavaThread "pool-1-thread-3" [_thread_blocked, id=5296, stack(0x079d0000,0x07a20000)]  0x06c2b000 JavaThread "Running JMSHandler-1" [_thread_blocked, id=7408, stack(0x07940000,0x07990000)]  0x06c2ac00 JavaThread "HTTPSessionSwapper" [_thread_blocked, id=6828, stack(0x078b0000,0x07900000)]  0x06c77c00 JavaThread "pool-1-thread-2" [_thread_blocked, id=3896, stack(0x07820000,0x07870000)]  0x07271800 JavaThread "Thread-3" [_thread_blocked, id=3180, stack(0x07790000,0x077e0000)]  0x06d2c400 JavaThread "MuxSecureListener" [_thread_in_native, id=7824, stack(0x076b0000,0x07700000)]  0x06ca2800 JavaThread "MuxListener" [_thread_in_native, id=8040, stack(0x068d0000,0x06920000)]  0x06bf5800 JavaThread "pool-1-thread-1" [_thread_blocked, id=6192, stack(0x06840000,0x06890000)]  0x06bf5400 JavaThread "LogManager" [_thread_blocked, id=1048, stack(0x06740000,0x06790000)]  0x05f69400 JavaThread "Low Memory Detector" daemon [_thread_blocked, id=6396, stack(0x063b0000,0x06400000)]=>0x05f65c00 JavaThread "C2 CompilerThread1" daemon [_thread_in_native, id=2708, stack(0x06320000,0x06370000)]  0x05f3d400 JavaThread "C2 CompilerThread0" daemon [_thread_blocked, id=4736, stack(0x06290000,0x062e0000)]  0x05f3ac00 JavaThread "Attach Listener" daemon [_thread_blocked, id=8056, stack(0x06200000,0x06250000)]  0x05f32000 JavaThread "Signal Dispatcher" daemon [_thread_blocked, id=6720, stack(0x06170000,0x061c0000)]  0x027d2c00 JavaThread "Finalizer" daemon [_thread_blocked, id=2296, stack(0x05ee0000,0x05f30000)]  0x027d1800 JavaThread "Reference Handler" daemon [_thread_blocked, id=4972, stack(0x05e50000,0x05ea0000)]  0x004db800 JavaThread "main" [_thread_blocked, id=716, stack(0x00430000,0x00480000)]Other Threads:  0x027ce800 VMThread [stack: 0x05dc0000,0x05e10000] [id=5688]  0x05f72400 WatcherThread [stack: 0x06440000,0x06490000] [id=7564]VM state:not at safepoint (normal execution)VM Mutex/Monitor currently owned by a thread: NoneHeap PSYoungGen      total 305856K, used 108523K [0x49ac0000, 0x5f010000, 0x5f010000)  eden space 262208K, 38% used [0x49ac0000,0x4fd23988,0x59ad0000)  from space 43648K, 17% used [0x5c570000,0x5cd075d8,0x5f010000)  to   space 43648K, 0% used [0x59ad0000,0x59ad0000,0x5c570000) PSOldGen        total 699072K, used 11615K [0x1f010000, 0x49ac0000, 0x49ac0000)  object space 699072K, 1% used [0x1f010000,0x1fb67c70,0x49ac0000) PSPermGen       total 78336K, used 58337K [0x0f010000, 0x13c90000, 0x1f010000)  object space 78336K, 74% used [0x0f010000,0x12908470,0x13c90000)Code Cache  [0x027e0000, 0x02b20000, 0x057e0000) total_blobs=1388 nmethods=1153 adapters=188 free_code_cache=47006656 largest_free_block=29760Dynamic libraries:0x00400000 - 0x00425000 D:\Java\x86\jdk1.6.0_31\bin\java.exe0x77cf0000 - 0x77e70000 C:\Windows\SysWOW64\ntdll.dll0x74fb0000 - 0x750c0000 C:\Windows\syswow64\kernel32.dll0x750c0000 - 0x75106000 C:\Windows\syswow64\KERNELBASE.dll0x75200000 - 0x752a0000 C:\Windows\syswow64\ADVAPI32.dll0x76b60000 - 0x76c0c000 C:\Windows\syswow64\msvcrt.dll0x75690000 - 0x756a9000 C:\Windows\SysWOW64\sechost.dll0x77200000 - 0x772f0000 C:\Windows\syswow64\RPCRT4.dll0x74f40000 - 0x74fa0000 C:\Windows\syswow64\SspiCli.dll0x74f30000 - 0x74f3c000 C:\Windows\syswow64\CRYPTBASE.dll0x7c340000 - 0x7c396000 D:\Java\x86\jdk1.6.0_31\jre\bin\msvcr71.dll0x6db90000 - 0x6dfe8000 D:\Java\x86\jdk1.6.0_31\jre\bin\server\jvm.dll0x766d0000 - 0x767d0000 C:\Windows\syswow64\USER32.dll0x752a0000 - 0x75330000 C:\Windows\syswow64\GDI32.dll0x75680000 - 0x7568a000 C:\Windows\syswow64\LPK.dll0x76d10000 - 0x76dad000 C:\Windows\syswow64\USP10.dll0x767d0000 - 0x76802000 C:\Windows\syswow64\WINMM.dll0x76ca0000 - 0x76d00000 C:\Windows\system32\IMM32.DLL0x755b0000 - 0x7567c000 C:\Windows\syswow64\MSCTF.dll0x71ad0000 - 0x71b1c000 C:\Windows\system32\apphelp.dll0x72f80000 - 0x72fb2000 C:\Windows\SysWOW64\nvinit.dll0x0f000000 - 0x0f006000 C:\Program Files (x86)\NVIDIA Corporation\CoProcManager\_etoured.dll0x71a90000 - 0x71acc000 C:\Program Files (x86)\NVIDIA Corporation\CoProcManager\nvd3d9wrap.dll0x75710000 - 0x758ad000 C:\Windows\syswow64\SETUPAPI.dll0x75330000 - 0x75357000 C:\Windows\syswow64\CFGMGR32.dll0x758b0000 - 0x7593f000 C:\Windows\syswow64\OLEAUT32.dll0x76db0000 - 0x76f0c000 C:\Windows\syswow64\ole32.dll0x76840000 - 0x76852000 C:\Windows\syswow64\DEVOBJ.dll0x71a50000 - 0x71a8b000 C:\Program Files (x86)\NVIDIA Corporation\CoProcManager\nvdxgiwrap.dll0x6d870000 - 0x6d87c000 D:\Java\x86\jdk1.6.0_31\jre\bin\verify.dll0x6d3d0000 - 0x6d3ef000 D:\Java\x86\jdk1.6.0_31\jre\bin\java.dll0x6d8b0000 - 0x6d8bf000 D:\Java\x86\jdk1.6.0_31\jre\bin\zip.dll0x6d6b0000 - 0x6d6c3000 D:\Java\x86\jdk1.6.0_31\jre\bin\net.dll0x76c10000 - 0x76c45000 C:\Windows\syswow64\WS2_32.dll0x75490000 - 0x75496000 C:\Windows\syswow64\NSI.dll0x722c0000 - 0x722fc000 C:\Windows\system32\mswsock.dll0x713f0000 - 0x713f6000 C:\Windows\System32\wship6.dll0x72510000 - 0x72520000 C:\Windows\system32\NLAapi.dll0x72500000 - 0x72510000 C:\Windows\system32\napinsp.dll0x72420000 - 0x72432000 C:\Windows\system32\pnrpnsp.dll0x72270000 - 0x722b4000 C:\Windows\system32\DNSAPI.dll0x724f0000 - 0x724f8000 C:\Windows\System32\winrnr.dll0x003e0000 - 0x003f7000 C:\Program Files (x86)\Common Files\Thunder Network\NetMon\net_monitor2.0.2.7.dll0x75a80000 - 0x766ca000 C:\Windows\syswow64\SHELL32.dll0x756b0000 - 0x75707000 C:\Windows\syswow64\SHLWAPI.dll0x7c3c0000 - 0x7c43c000 C:\Windows\system32\MSVCP71.dll0x73680000 - 0x73689000 C:\Windows\system32\VERSION.dll0x73640000 - 0x7364b000 C:\Windows\system32\profapi.dll0x71bb0000 - 0x71bb5000 C:\Windows\System32\wshtcpip.dll0x73620000 - 0x7363c000 C:\Windows\system32\IPHLPAPI.DLL0x73610000 - 0x73617000 C:\Windows\system32\WINNSI.DLL0x71400000 - 0x71406000 C:\Windows\system32\rasadhlp.dll0x71420000 - 0x71458000 C:\Windows\System32\fwpuclnt.dll0x6d600000 - 0x6d609000 D:\Java\x86\jdk1.6.0_31\jre\bin\management.dll0x6d6d0000 - 0x6d6d9000 D:\Java\x86\jdk1.6.0_31\jre\bin\nio.dll0x6d850000 - 0x6d858000 D:\Java\x86\jdk1.6.0_31\jre\bin\sunmscapi.dll0x75370000 - 0x7548e000 C:\Windows\syswow64\CRYPT32.dll0x74fa0000 - 0x74fac000 C:\Windows\syswow64\MSASN1.dll0x72f00000 - 0x72f16000 C:\Windows\system32\CRYPTSP.dll0x72ec0000 - 0x72efb000 C:\Windows\system32\rsaenh.dll0x73650000 - 0x73667000 C:\Windows\system32\USERENV.dll0x6d370000 - 0x6d38a000 D:\Java\x86\jdk1.6.0_31\jre\bin\instrument.dll0x724e0000 - 0x724ed000 C:\Windows\system32\dhcpcsvc6.DLL0x72540000 - 0x72552000 C:\Windows\system32\dhcpcsvc.DLL0x6d7a0000 - 0x6d7a6000 D:\Java\x86\jdk1.6.0_31\jre\bin\rmi.dll0x76d00000 - 0x76d05000 C:\Windows\system32\PSAPI.DLL0x6d0b0000 - 0x6d1fc000 D:\Java\x86\jdk1.6.0_31\jre\bin\awt.dll0x72c60000 - 0x72cb1000 C:\Windows\system32\WINSPOOL.DRV0x73190000 - 0x7332e000 C:\Windows\WinSxS\x86_microsoft.windows.common-controls_6595b64144ccf1df_6.0.7601.17514_none_41e6975e2bd6f2b2\COMCTL32.dllVM Arguments:jvm_args: -Dcom.apusic.domain.home=D:\AAS8.0\AAS\domains\mydomain -Xms1024m -Xmx1024m -XX:MaxPermSize=256m java_command: com.apusic.server.Main -root D:\AAS8.0\AASLauncher Type: SUN_STANDARDEnvironment Variables:JAVA_HOME=D:\Java\x86\jdk1.6.0_31CLASSPATH=D:\AAS8.0\AAS\classes;D:\AAS8.0\AAS\common\javaee.jar;D:\AAS8.0\AAS\common\jsf-api.jar;D:\AAS8.0\AAS\lib\apusic-client.jar;D:\AAS8.0\AAS\lib\apusic-jms.jar;D:\AAS8.0\AAS\lib\apusic-ws.jar;D:\AAS8.0\AAS\lib\apusic.jar;D:\AAS8.0\AAS\lib\bean-validator.jar;D:\AAS8.0\AAS\lib\deploy.jar;D:\AAS8.0\AAS\lib\elite-api.jar;D:\AAS8.0\AAS\lib\elite.jar;D:\AAS8.0\AAS\lib\firststep.jar;D:\AAS8.0\AAS\lib\jasper-jdt.jar;D:\AAS8.0\AAS\lib\mejb.jar;D:\AAS8.0\AAS\lib\operamasks-impl.jar;D:\AAS8.0\AAS\lib\razor.jar;D:\AAS8.0\AAS\lib\ext\activation.jar;D:\AAS8.0\AAS\lib\ext\bcprov-jdk15-138.jar;D:\AAS8.0\AAS\lib\ext\dsn.jar;D:\AAS8.0\AAS\lib\ext\eclipselink.jar;D:\AAS8.0\AAS\lib\ext\jaxb-impl.jar;D:\AAS8.0\AAS\lib\ext\jaxb-xjc.jar;D:\AAS8.0\AAS\lib\ext\jgroups-all.jar;D:\AAS8.0\AAS\lib\ext\jhall.jar;D:\AAS8.0\AAS\lib\ext\jmxremote.jar;D:\AAS8.0\AAS\lib\ext\jmxremote_optional.jar;D:\AAS8.0\AAS\lib\ext\ldapjdk.jar;D:\AAS8.0\AAS\lib\ext\ldapsp.jar;D:\AAS8.0\AAS\lib\ext\mail.jar;D:\AAS8.0\AAS\lib\ext\operamasks-third-party.jar;D:\AAS8.0\AAS\lib\ext\standard.jar;D:\AAS8.0\AAS\lib\ext\toplink-essentials-agent.jar;D:\AAS8.0\AAS\lib\ext\toplink-essentials.jar;D:\AAS8.0\AAS\lib\ext\xmemcached.jar;.;D:\Java\x86\jdk1.6.0_31\lib\tools.jar;D:\Java\x86\jdk1.6.0_31\lib\dt.jarPATH=D:\AAS8.0\AAS\bin;D:\Java\x86\jdk1.6.0_31\bin;D:\Java\x86\jdk1.6.0_31\bin;C:\Program Files (x86)\Common Files\NetSarang;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\Lenovo\Access Connections\;D:\MySQL\MySQL Server 5.5\bin;C:\Program Files (x86)\Common Files\Roxio Shared\DLLShared\;D:\Program Files (x86)\QuickTime\QTSystem\;d:\SSH Communications Security\SSH Secure ShellUSERNAME=mortimerOS=Windows_NTPROCESSOR_IDENTIFIER=Intel64 Family 6 Model 42 Stepping 7, GenuineIntel---------------  S Y S T E M  ---------------OS: Windows 7 , 64 bit Build 7601 Service Pack 1CPU:total 4 (2 cores per cpu, 2 threads per core) family 6 model 42 stepping 7, cmov, cx8, fxsr, mmx, sse, sse2, sse3, ssse3, sse4.1, sse4.2, popcnt, htMemory: 4k page, physical 8273136k(4724820k free), swap 16544420k(12014064k free)vm_info: Java HotSpot(TM) Server VM (20.6-b01) for windows-x86 JRE (1.6.0_31-b05), built on Feb  3 2012 18:35:56 by "java_re" with MS VC++ 7.1 (VS2003)time: Mon Aug 27 15:11:04 2012elapsed time: 66 seconds

發生問題以後，再次啟動AS，使用jconsole監控，加os的資源管理員查看，一切看起來都非常正常。單單從錯誤記錄檔來看，是記憶體不足導致JVM的carsh。

啟動參數：-server -Xms1024M -Xmx1024m -XX:MaxPermSize=128m

但是，本機有8G記憶體，運行此應用時，僅僅用了不到3G，試著使用-Xmx加大記憶體，試著提升到1600M，但是，無法啟動，最終定位在1200M，但是，AS依然會在運行一段時間後crash。
接下來就是各種google，有人說這是jdk1.6的bug不過人家的小版本號碼是25（甚至還有某些號稱某電商的人，建議復原至update24版本），我這是31，難道這個bug一直沒有關閉？關於這個問題在StackOverflow有一篇文章（http://stackoverflow.com/questions/6344546/java-6-update-25-vm-crash-insufficient-memory），問題跟我一樣，並且採用了各種辦法貌似是最終解決了。

樓主在啟動時加上了-XX:-DoEscapeAnalysis參數，但是我這依然不可以，這個參數貌似是不再分析可能的溢出，我這隻是將crash的時間稍微延後了一些，問題依然沒有解決。

再查看此帖的後面，說是降低-Xmx的大小，而且在jvm的崩潰日誌中也提到降低-Xmx/Xms的大小，於是試著降低大小，並且把as啟動時的jvm參數全部去掉，使用預設值。問題竟然解決了（但是，根據官方說明，-Xmx的大小預設應該是實體記憶體的1/4，在我這也就是2g，這個值比我設定的參數要大，只是指定之後就出問題），從目前來看，as運行了半小時依然沒有問題（開始時是1分鐘以內自動crash）。但是，在實際的生產環境中，JVM預設的參數，往往不能滿足需要，因此，就出現一個問題：既然作業系統已經安裝64位，並且JDK有64位版本存在，生產環境下盡量在64位的os下安裝使用64位jdk，從而把效能發揮至最優。

關於為何要降低jvm堆的大小，有以下說明：

JVM線程堆棧應用程式中的每個線程都需要記憶體來儲存空間堆棧（用於在調用函數時持有局部變數並維護狀態的記憶體地區）。每個 Java 線程都需要堆棧空間來運行。根據實現的不同，Java 線程可以分為本機線程和 Java 堆棧。除了堆棧空間，每個線程還需要為執行緒區域儲存（thread-local storage）和內部資料結構提供一些本機記憶體。JVM堆棧大小-Xss 128k：設定每個線程的堆棧大小。JDK5.0以後每個線程堆 棧大小為1M，以前每個線程堆棧大小為256K。根據應用的線程所需記憶體大小進行調整。在相同實體記憶體下，減小這個值能產生更多的線程。但是作業系統對一個進程內的線程數還是有限制的，不能無限產生，經驗值在3000~5000左右。JVM heap與JVM私人記憶體、JVM線程堆棧大小間的關係及平衡。線程棧的大小是個雙刃劍，如果設定過小，可能會出現棧溢出，特別是在該線程內有遞迴、大的迴圈時出現溢出的可能性更大，如果該值設定過大，就又影響到建立棧的數量，如果是多線程的應用，就會出現記憶體溢出的錯誤．

而對於此問題的解決，還有另外一篇文章http://www.blogsoncloud.com/jsp/techSols/java-lang-OutOfMemoryError-unable-to-create-new-native-thread.jsp，此文依然是介紹讓降低JVM堆分配的記憶體。