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  1. JDK
  2. JDK-8185005

Improve performance of ThreadMXBean.getThreadInfo(long ids[], int maxDepth)

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      Description

        The implementation of getThreadInfo(long ids[], int maxDepth) iterates over the ids array, calling Threads::find_java_thread_from_java_tid() for each one. find_java_thread_from_java_tid() does a linear search over the thread list, so if the ids array length is large, it can take quite some time to find the corresponding JavaThread*s. One idea is to add find_java_threads_from_java_tids() to get them all at once and have it put the content of the ids array into a set (hashtable, perhaps) for a "sufficiently large" ids array.

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          1. self-monitoring-results.png
            67 kB
            Paul Hohensee
          2. jdk8-8185005.diff
            22 kB
            Paul Hohensee
          3. global-monitoring-results.png
            72 kB
            Paul Hohensee

          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-8235794 Improve performance of ThreadMXBean.getThreadInfo(long ids[], int maxDepth)

            • 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-8237334 Improve performance of ThreadMXBean.getThreadInfo(long ids[], int maxDepth)

            • 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-8274647 Improve performance of ThreadMXBean.getThreadInfo(long ids[], int maxDepth)

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

            Enhancement - null JDK-8207266 ThreadMXBean::getThreadAllocatedBytes() can be quicker for self thread

            • 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-8231666 ThreadIdTable::grow() invokes invalid thread transition

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

            Bug - A problem which impairs or prevents the functions of the product. JDK-8288139 JavaThread touches oop after GC barrier is detached

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

            Enhancement - null JDK-8229391 Improve performance for com.sun.management.ThreadMXBean#getThreadAllocatedBytes(long) for current thread

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

            Commit Commit openjdk/jdk13u-dev/42c55e7c

            Review Review openjdk/jdk13u-dev/266

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                dtitov Daniil Titov (Inactive)
                phh Paul Hohensee
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                  Updated:
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