John Ross created ARIES-1389:
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Summary: Compute service requirements and capabilities once in
BundleRevisionResource.
Key: ARIES-1389
URL: https://issues.apache.org/jira/browse/ARIES-1389
Project: Aries
Issue Type: Improvement
Components: Subsystem
Affects Versions: subsystem-2.0.2
Reporter: John Ross
Assignee: John Ross
BundleRevisionResource computes the service capabilities with each call to
getCapabilities. Testing has shown that this is having an unacceptable
performance impact.
Profiling showed that BundleRevisionResource.getCapabilities was taking up
16.9%, or 7368 ms, of the total time. After the optimization, this was reduced
to 0.1%, or 50 ms.
The measurements used the same test scenario being developed as part of
ARIES-1357. The time it took to install 50 features was measured. Each feature
consists of 10 bundles plus one application. All features share the same 10
bundles. Each bundle exports 5 unique packages. Each application consists of 10
unique bundles. The bundles import packages offered by the containing feature.
Baseline
Average time across 1 trials: 42352.0 ms
Average time across 1 trials: 43709.0 ms
Average time across 1 trials: 43309.0 ms
Average time across 1 trials: 43234.0 ms
Average time across 1 trials: 41946.0 ms
Total Average: 42910
BundleRevisionResource Optimization
Average time across 1 trials: 32743.0 ms
Average time across 1 trials: 33094.0 ms
Average time across 1 trials: 32905.0 ms
Average time across 1 trials: 32015.0 ms
Average time across 1 trials: 32226.0 ms
Total Average: 32596.6
A 24% overall improvement. The solution was to compute the service capabilities
once at object construction time. The same strategy was also employed for
service requirements in anticipation that the same performance bottleneck would
exist there, although that was not tested here.
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