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  1. JDK
  2. JDK-6725714

par compact - add a table to speed up bitmap searches

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    • gc
    • b36
    • generic
    • generic

    Backports

      Description

        The parallel compacting collector (par compact, or par old) uses a table to track data about contiguous regions of the gc heap such as how much data is live in the region, whether a live object crosses onto the region, etc. Each region is currently fairly small to limit the portion of the marking bitmap that must be searched to compute the new (after compaction) location of an object. Regions could be made significantly larger (100x or more) by adding a very small table which holds data about object starts. Making regions larger would shrink the size of the data used by par compact, would translate directly into speed ups of phases that operate on regions, and may also speed up pointer updates by reducing the length of bitmap searches.

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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-8015750 par compact - add a table to speed up bitmap searches

            • P3 - Major loss of function.
            • 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-8015937 par compact - add a table to speed up bitmap searches

            • P3 - Major loss of function.
            • 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-8016393 par compact - add a table to speed up bitmap searches

            • P3 - Major loss of function.
            • 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-8021519 par compact - add a table to speed up bitmap searches

            • P3 - Major loss of function.
            • 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-8021741 par compact - add a table to speed up bitmap searches

            • P3 - Major loss of function.
            • 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-8016191 par compact - add a table to speed up bitmap searches

            • P3 - Major loss of function.
            • Closed

            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-8018370 par compact - add a table to speed up bitmap searches

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

            Enhancement - null JDK-7164100 Throughput collector shows performance regression vs jrockit

            • P3 - Major loss of function.
            • Closed

            Enhancement - null JDK-6729594 par compact - remove unused block table implementation

            • P3 - Major loss of function.
            • Closed

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                jcoomes John Coomes (Inactive)
                jcoomes John Coomes (Inactive)
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