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  1. JDK
  2. JDK-8209120

Archive the Integer.IntegerCache

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    Backports

      Description

        Archiving the IntegerCache into the CDS archive turns out to be profitable.

        Experiments shows ~1M fewer instructions in the default case (<0.5ms), with an implementation that deals gracefully with cases where a larger or smaller cache than archived has been requested.

        In case a larger cache is archived and then requested, the gain is greater since the loading/mapping of the cache happens in constant rather than linear time, observing a ~150ms speedup on something like this:

        java -Xshare:dump -Djava.lang.Integer.IntegerCache.high=65535
        java -Xshare:on -Djava.lang.Integer.IntegerCache.high=65535 HelloWorld

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            backported by

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8230512 Archive the Integer.IntegerCache

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

            Enhancement - null JDK-8207263 Store the Configuration for system modules into CDS archive

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

            Enhancement - null JDK-8213033 Archive remaining primitive box caches

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

            Enhancement - null JDK-8202035 Archive the set of ModuleDescriptor and ModuleReference objects for observable system modules with unnamed initial module

            • P3 - Major loss of function.
            • Resolved

            Enhancement - null JDK-8206115 Use shared macros for JavaClasses::compute_offsets and MetaspaceShared::serialize_well_known_classes

            • P3 - Major loss of function.
            • Resolved

            Enhancement - null JDK-8212995 Place the Integer.IntegerCache and cached Integer objects in the closed archive heap region

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

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                redestad Claes Redestad
                redestad Claes Redestad
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