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  1. JDK
  2. JDK-8185496

Improve performance of system properties initialization in initPhase1

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    Description

      The initialization of the system properties in System.initPhase1 is very inefficient due to the number of upcalls to Properties set/get/remove methods. In addition, it merges the properties from the VM which also invokes Properties methods.
      [Potential improveoments to property upcalls will be addressed with issue 4947890. ]

      Additionally, there are properties that are initialized to empty or default values in native. That causes extra processing of each property before the value is needed. The properties should be left uninitialized and defaults applied when they are first used.
      For example, sun.cpu.isalist, sun.os.patch.level, user.timezone.
      Also, there redundant values in java_props_md.c for:
           sprops.display_language = sprops.language;
           sprops.display_script = sprops.script;
           sprops.display_country = sprops.country;
           sprops.display_variant = sprops.variant;

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          csr for

          CSR - null JDK-8213551 Initial value of user.timezone system property change

          • P3 - Major loss of function.
          • Closed
          relates to

          Bug - A problem which impairs or prevents the functions of the product. JDK-7016814 Refactor sun.misc.VM that a list of private internal properties can be shared by other code

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Open

          Enhancement - null JDK-8066709 Make some JDK system properties read only

          • P3 - Major loss of function.
          • Resolved

          Enhancement - null JDK-8189319 Add a java.util.Properties constructor that takes an initial capacity

          • P3 - Major loss of function.
          • Resolved

          Bug - A problem which impairs or prevents the functions of the product. JDK-8213424 VersionProps duplicate and skipped initialization

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Resolved

          Enhancement - null JDK-4947890 Minimize JNI upcalls in system-properties initialization

          • P3 - Major loss of function.
          • Resolved
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              rriggs Roger Riggs
              alanb Alan Bateman
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                Updated:
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