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From "Knut Anders Hatlen (JIRA)" <j...@apache.org>
Subject [jira] Created: (DERBY-3885) Latch contention in B-tree on multi-core systems
Date Fri, 26 Sep 2008 13:37:44 GMT
Latch contention in B-tree on multi-core systems
------------------------------------------------

                 Key: DERBY-3885
                 URL: https://issues.apache.org/jira/browse/DERBY-3885
             Project: Derby
          Issue Type: Improvement
          Components: Performance, Store
    Affects Versions: 10.4.2.0
            Reporter: Knut Anders Hatlen
            Priority: Minor


When you have many concurrent threads accessing rows in the same table via an index, the root
of the B-tree becomes a hot spot. Since access to a node in the B-tree is single-threaded
(an exclusive latch is held while a binary search is performed on the node) this limits the
scalability on multi-core systems. We should try to find a way to allow multiple threads to
navigate the B-tree concurrently without blocking each other.

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