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  1. JDK
  2. JDK-8244540

Print more information with -XX:+PrintSharedArchiveAndExit

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    Details

    • Type: Enhancement
    • Status: Resolved
    • Priority: P4
    • Resolution: Fixed
    • Affects Version/s: 14
    • Fix Version/s: 17
    • Component/s: hotspot
    • Labels:
    • Subcomponent:
    • Resolved In Build:
      b16

      Description

      Currently -XX:+PrintSharedArchiveAndExit doesn't print much information. For diagnostic/development purpose, it's better to print more detailed information of the archive header(s).

      $ java -XX:+PrintSharedArchiveAndExit
      [0.002s][info][class,path] opened: /jdk2/bld/jem/images/jdk/lib/modules
      [0.006s][info][class,path] Expecting BOOT path=/jdk2/bld/jem/images/jdk/lib/modules
      [0.006s][info][class,path] Expecting -Djava.class.path=
      [0.006s][info][class,path] checking shared classpath entry: /jdk2/bld/jem/images/jdk/lib/modules
      [0.006s][info][class,path] ok
      archive is valid

      (You can get more information with this, but still not sufficient)

      $ java -XX:+PrintSharedArchiveAndExit -Xlog:cds*=debug
      [0.002s][info][class,path] opened: /jdk2/bld/jem/images/jdk/lib/modules
      [0.007s][info][cds ] Archive was created with UseCompressedOops = 1, UseCompressedClassPointers = 1
      [0.007s][debug][cds ] Reserved archive_space_rs [0x0000000900000000 - 0x0000000900b31000] (11735040) bytes
      [0.007s][debug][cds ] Reserved class_space_rs [0x0000000900b31000 - 0x0000000940b31000] (1073741824) bytes
      [0.007s][info ][cds ] Mapped static region #0 at base 0x0000000900000000 top 0x0000000900003000 (MiscCode)
      [0.007s][info ][cds ] Mapped static region #1 at base 0x0000000900003000 top 0x00000009003e5000 (ReadWrite)
      [0.007s][info ][cds ] Mapped static region #2 at base 0x00000009003e5000 top 0x0000000900b31000 (ReadOnly)
      [0.007s][info ][class,path] Expecting BOOT path=/jdk2/bld/jem/images/jdk/lib/modules
      [0.007s][info ][class,path] Expecting -Djava.class.path=
      [0.007s][info ][class,path] checking shared classpath entry: /jdk2/bld/jem/images/jdk/lib/modules
      [0.007s][info ][class,path] ok
      [0.007s][info ][cds ] CDS archive was created with max heap size = 16096M, and the following configuration:
      [0.007s][info ][cds ] narrow_klass_base = 0x0000000900000000, narrow_klass_shift = 3
      [0.007s][info ][cds ] narrow_oop_mode = 1, narrow_oop_base = 0x0000000000000000, narrow_oop_shift = 3
      [0.007s][info ][cds ] The current max heap size = 16096M, HeapRegion::GrainBytes = 8388608
      [0.007s][info ][cds ] narrow_klass_base = 0x0000000900000000, narrow_klass_shift = 3
      [0.007s][info ][cds ] narrow_oop_mode = 1, narrow_oop_base = 0x0000000000000000, narrow_oop_shift = 3
      [0.007s][info ][cds ] CDS heap data relocation delta = 0 bytes
      [0.007s][info ][cds ] Trying to map heap data: region[4] at 0x00000007bf800000, size = 507904 bytes
      [0.007s][info ][gc,cds ] Mark closed archive regions in map: [0x00000007bf800000, 0x00000007bf87bff8]
      [0.007s][info ][cds ] Trying to map heap data: region[6] at 0x00000007bf000000, size = 335872 bytes
      [0.007s][info ][gc,cds ] Mark open archive regions in map: [0x00000007bf000000, 0x00000007bf051ff8]
      [0.007s][debug][cds,vtables] Copying 14 vtable entries for ConstantPool
      [0.007s][debug][cds,vtables] Copying 40 vtable entries for InstanceKlass
      [0.007s][debug][cds,vtables] Copying 40 vtable entries for InstanceClassLoaderKlass
      [0.007s][debug][cds,vtables] Copying 40 vtable entries for InstanceMirrorKlass
      [0.007s][debug][cds,vtables] Copying 40 vtable entries for InstanceRefKlass
      [0.007s][debug][cds,vtables] Copying 14 vtable entries for Method
      [0.007s][debug][cds,vtables] Copying 41 vtable entries for ObjArrayKlass
      [0.007s][debug][cds,vtables] Copying 41 vtable entries for TypeArrayKlass
      archive is valid

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              Assignee:
              minqi Yumin Qi
              Reporter:
              iklam Ioi Lam
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                Dates

                Created:
                Updated:
                Resolved: