Matt Doran wrote:
Rick Hillegas <[EMAIL PROTECTED]> writes:
* Performance and Memory Usage
o Reduces CPU usage in embedded mode.
Can anyone provide any more information on the above point? I had a look at
Jira but couldn't find the issue(s) related to this.
There were several performance improvements that went in to this
release. I probably do not remember all of them but here are at least some:
* Reuse of ResultSet (DERBY-827)
* New lock manager - CPU reduction mostly as a result of much less
synchronization (several JIRAs, eg. DERBY-1704)
* Move latching out of lock manager (DERBY-2107)
* BitSet manipulations (several JIRAs, e.g DERBY-2226, 2191)
* Reduced use of synchronization (several JIRAs, eg 2149, 2150)
For some examples comparing the performance of Derby 10.2 and Derby 10.3
see for instance slide 29 in:
http://home.online.no/~olmsan/publications/pres/apachecon07eu/DerbyApacheCon07eu.pdf
or slide 30 in:
http://home.online.no/~olmsan/publications/pres/jazoon07/JavaDbJazoon07.pdf
For improvements for some other types of loads see also the results from
a nightly performance regression test which compares trunk to 10.2.2:
http://home.online.no/~olmsan/derby/perf/
Olav
