Uploaded image for project: 'JDK'
  1. JDK
  2. JDK-8234610

MaxVectorSize set wrongly when UseAVX=3 is specified after JDK-8221092

    XMLWordPrintable

Details

    • 14
    • b25
    • x86
    • generic
    • Not verified

    Backports

      Description

        On Skylake platform the JVM by default sets the UseAVX level to 2 and accordingly sets MaxVectorSize to 32 bytes as per JDK-8221092.
        When the user explicitly want to use AVX3 on skylake platform they need to invoke the JVM with -XX:UseAVX=3 command line argument. This should aumatically result in MaxVectorSize being set to 64 bytes. However post JDK-8221092, when -XX:UseAVX=3 is given on command line, the MaxVectorSize is being wrongly set to 16 bytes.

        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-8238541 MaxVectorSize set wrongly when UseAVX=3 is specified after JDK-8221092

            • P2 - Crashes, loss of data, severe memory leak.
            • 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-8241572 MaxVectorSize set wrongly when UseAVX=3 is specified after JDK-8221092

            • P2 - Crashes, loss of data, severe memory leak.
            • 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-8235393 MaxVectorSize set wrongly when UseAVX=3 is specified after JDK-8221092

            • P2 - Crashes, loss of data, severe memory leak.
            • Closed
            relates to

            Bug - A problem which impairs or prevents the functions of the product. JDK-8221092 UseAVX=3 has performance degredation on Skylake (X7) processors

            • P3 - Major loss of function.
            • Resolved

            Activity

              People

                sviswanathan Sandhya Viswanathan
                sviswanathan Sandhya Viswanathan
                Votes:
                0 Vote for this issue
                Watchers:
                5 Start watching this issue

                Dates

                  Created:
                  Updated:
                  Resolved: