openjpa-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Rick Curtis (JIRA)" <>
Subject [jira] Created: (OPENJPA-1872) Optimize CacheMap read performance
Date Thu, 04 Nov 2010 17:35:42 GMT
Optimize CacheMap read performance

                 Key: OPENJPA-1872
             Project: OpenJPA
          Issue Type: Improvement
          Components: performance
    Affects Versions: 2.1.0
            Reporter: Rick Curtis
            Assignee: Rick Curtis
            Priority: Minor
             Fix For: 2.1.0

While digging through a profile I noticed that for every CacheMap.get(..) call where there
is a hit, I was seeing two underlying ConcurrentHashMap.get method calls. This is because
we always look to see if a given key exists in the pinned map before looking in the main map.
As the code stands today, it is optimized for the existence of entries in the pinned map and
I think that is an incorrect assumption.

With this JIRA I'm going to optimize the get(...), containsKey(...), and containsValue(...)
to check the main map for results before looking at the pinned map. In a micro benchmark I
observed approximately a 20% improvement in the time required to call get(...) when there
is a hit.

This message is automatically generated by JIRA.
You can reply to this email to add a comment to the issue online.

View raw message