F:\JDK\IBM142\bin>java -Xmx2047M -version

　　java version “1.4.2″

　　Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2)

　　Classic VM (build 1.4.2, J2RE 1.4.2 IBM Windows 32 build cn1420-20040626 (JIT enabled: jitc))

　　F:\JDK\IBM142\bin>java -Xmx2048M -version

　　[ Unable to allocate an initial java heap of 2147483648 bytes. ]

　　[ **Out of memory, aborting** ]

　　[ ]

　　[ *** panic: JVMST016: Cannot allocate memory for initial java heap ]

　　abnormal program termination

　　=====================================================================

　　F:\BEA\JRockit\bin>java -version

　　java version “1.4.2_05″

　　Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_05-b04)

　　BEA WebLogic JRockit(TM) 1.4.2_05 JVM R24.4.0-1 (build ari-38120-20041118-1131-win-ia32, Native Threads, GC strategy: parallel)

　　F:\BEA\JRockit\bin>REM The default VM is jrockit.

　　F:\BEA\JRockit\bin>java -Xmx1617M -version

　　java version “1.4.2_05″

　　Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_05-b04)

　　BEA WebLogic JRockit(TM) 1.4.2_05 JVM R24.4.0-1 (build ari-38120-20041118-1131-win-ia32, Native Threads, GC strategy: parallel)

　　F:\BEA\JRockit\bin>java -Xmx1618M -version

　　Unable to acquire some virtual address space - reduced from 1656832 to 1640260 KB!

　　java version “1.4.2_05″

　　Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_05-b04)

　　BEA WebLogic JRockit(TM) 1.4.2_05 JVM R24.4.0-1 (build ari-38120-20041118-1131-win-ia32, Native Threads, GC strategy: parallel)

　　F:\BEA\JRockit\bin>REM -jrockit      to select the “jrockit” VM

　　F:\BEA\JRockit\bin>java -jrockit -Xmx1617M -version

　　java version “1.4.2_05″

　　Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_05-b04)

　　BEA WebLogic JRockit(TM) 1.4.2_05 JVM R24.4.0-1 (build ari-38120-20041118-1131-win-ia32, Native Threads, GC strategy: parallel)

　　F:\BEA\JRockit\bin>java -jrockit -Xmx1618M -version

　　Unable to acquire some virtual address space - reduced from 1656832 to 1640260 KB!

　　java version “1.4.2_05″

　　Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_05-b04)

　　BEA WebLogic JRockit(TM) 1.4.2_05 JVM R24.4.0-1 (build ari-38120-20041118-1131-win-ia32, Native Threads, GC strategy: parallel)

　　我的测试记录：

　　C:\>java -client -Xmx1441M -version

　　java version “1.6.0_05″

　　Java(TM) SE Runtime Environment (build 1.6.0_05-b13)

　　Java HotSpot(TM) Client VM (build 10.0-b19, mixed mode)

　　C:\>java -client -Xmx1442M -version

　　java version “1.6.0_05″

　　Java(TM) SE Runtime Environment (build 1.6.0_05-b13)

　　Java HotSpot(TM) Client VM (build 10.0-b19, mixed mode)

　　C:\>java -client -Xmx1443M -version

　　Error occurred during initialization of VM

　　Could not reserve enough space for object heap

　　Could not create the Java virtual machine.

　　C:\>java -server -Xmx1443M -version

　　Error: no `server’ JVM at `C:\Program Files\Java\jre1.6.0_05\bin\server\jvm.dll’.

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