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  1. JDK
  2. JDK-8027476

Improve performance of Stringtable unlink

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    • gc
    • b03

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      Description

        At the end of a GC that treated strings as a weak root for traversal, the string table is scanned for unreferenced entries, which are then deleted.

        This can be time-consuming if the string table is large; this RFE is about improving the performance.

        One way to do this is to parallelize the effort; JDK-8004888 implemented parallel traversal by claiming hash table buckets on a per-thread basis. A similar method could be applied in this case, and provided for all uses in a parallel collector (at least CMS, the parallel gcs, G1 full gc and during the G1 remark pause).

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            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-8032232 Improve performance of Stringtable unlink

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

            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-8033519 Improve performance of Stringtable unlink

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

            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-8034538 Improve performance of Stringtable unlink

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

            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-8045197 Improve performance of Stringtable unlink

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

            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-8053202 Improve performance of Stringtable unlink

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

            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-8028403 Improve performance of Stringtable unlink

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

            Bug - A problem which impairs or prevents the functions of the product. JDK-8033443 Test8000311 fails after latest changes to parallelize string and symbol table unlink

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

            Bug - A problem which impairs or prevents the functions of the product. JDK-8033106 Wrong predicate for checking whether the correct amount of symbol table entries have been processed in G1

            • P5 - Cosmetic problem like misspelt words or misaligned text.
            • Resolved

            Enhancement - null JDK-8031472 Fine tune string/symbol table parallelization

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

            Enhancement - null JDK-8031473 Parallelize symbol table and string table unlink in non-G1 parallel collectors

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

            Enhancement - null JDK-8031565 Use serial/waiting time to perform independent tasks during young gc in G1

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

            Enhancement - null JDK-8027454 Do not traverse string table during G1 remark when treating them as strong roots during initial mark

            • P3 - Major loss of function.
            • Resolved

            Enhancement - null JDK-6996604 Use more efficient (not linear) data structure for searching buckets in SymbolTable

            • P3 - Major loss of function.
            • Closed

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                tschatzl Thomas Schatzl
                tschatzl Thomas Schatzl
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