[ http://issues.apache.org/jira/browse/DERBY-2050?page=all ]
Dyre Tjeldvoll updated DERBY-2050:
----------------------------------
Attachment: derby-2050.diff
derby-2050.stat
Seems like this change was possibly more controversial than I thought, but I'm
attaching a patch anyway. Maybe those who are interested can look at the patch.
Personally I found it very enlightening to compare the bytecode (using javap)
generated for bitfield access with that generated for access to booleans .
> Manipulating CachedItems could be more efficient
> ------------------------------------------------
>
> Key: DERBY-2050
> URL: http://issues.apache.org/jira/browse/DERBY-2050
> Project: Derby
> Issue Type: Improvement
> Components: Performance
> Affects Versions: 10.2.1.6
> Reporter: Dyre Tjeldvoll
> Priority: Trivial
> Fix For: 10.3.0.0
>
> Attachments: derby-2050.diff, derby-2050.stat
>
>
> CachedItem's state is currently recorded in bit fields of an integer
> variable. Changing this to 6 boolean member variables reduces cpu usage.
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