Uploaded image for project: 'JDK'
  1. JDK
  2. JDK-8185572

Enable AssumeMP by default on SPARC machines

    XMLWordPrintable

Details

    • b21

    Backports

      Description

        Valdimir Kozlov's evaluation:

        I looked on hs_err files for 8-60 and 8-111 (I don't have permission to look
        on 8-131). They have next line about CPU:

        CPU:total 1 v9, popc, vis1, vis2, vis3, blk_init, cbcond, aes, sha1, sha256,
        sha512, sun4v, niagara_plus

        A strange thing is it lists only 1 thread: "total 1 v9". Looks like it was
        running in some kind of VM.

        is_MP() will return false in such case!!!

        To finalize set of BIS instructions we have to issue membar at the end:

        http://hg.openjdk.java.net/jdk8u/jdk8u-dev/hotspot/file/d3cc20285653/src/cpu/sparc/vm/stubGenerator_sparc.cpp#l1106

        But membar instruction is not generated if MP is false:

        http://hg.openjdk.java.net/jdk8u/jdk8u-dev/hotspot/file/d3cc20285653/src/cpu/sparc/vm/macroAssembler_sparc.inline.hpp#l651

        I think this is the cause of the problem.

        To verify that run with -XX:+AssumeMP

        http://hg.openjdk.java.net/jdk8u/jdk8u-dev/hotspot/file/d3cc20285653/src/share/vm/runtime/os.hpp#l217

        We should set AssumeMP to true on SPARC.

        Attachments

          Issue Links

            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-8186254 Enable AssumeMP by default on SPARC machines

            • 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-8186538 Enable AssumeMP by default on SPARC machines

            • 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-8188209 Enable AssumeMP by default on SPARC machines

            • 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-8188612 Enable AssumeMP by default on SPARC machines

            • 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-8188688 Enable AssumeMP by default on SPARC machines

            • 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-8190306 Enable AssumeMP by default on SPARC machines

            • 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-8192247 Enable AssumeMP by default on SPARC machines

            • 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-8197277 Enable AssumeMP by default on SPARC machines

            • 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-8198051 Enable AssumeMP by default on SPARC machines

            • 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-8186240 Enable AssumeMP by default on SPARC machines

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • 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-8186913 Enable AssumeMP by default on SPARC machines

            • 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-8185062 Set AssumeMP to true and deprecate the flag

            • P3 - Major loss of function.
            • Resolved

            Activity

              People

                poonam Poonam Bajaj Parhar
                poonam Poonam Bajaj Parhar
                Votes:
                0 Vote for this issue
                Watchers:
                5 Start watching this issue

                Dates

                  Created:
                  Updated:
                  Resolved: