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https://issues.apache.org/jira/browse/ARIES-1357?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14712989#comment-14712989
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John Ross commented on ARIES-1357:
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Just to be clear, with regard to your (3), the subsystem and deployment
manifests do cache the values. Adding those additional local variables
mentioned in my (3), as far as I call tell, simply save two additional method
calls that end up accessing the value from a hash map. The persisted manifest
is not read as part of that process, which is why I have doubts about the
performance impact.
I would like to build a test that matches your use case for further analysis.
If I create an application containing 200 features which all have the same
content consisting of 25 bundles or so (i.e. many features with shared
content), would that be a close approximation?
> BasicSubsystem can be used by the subsystem install process a factor 6 times
> faster
> -----------------------------------------------------------------------------------
>
> Key: ARIES-1357
> URL: https://issues.apache.org/jira/browse/ARIES-1357
> Project: Aries
> Issue Type: Improvement
> Components: Subsystem
> Affects Versions: subsystem-core-1.2.0, subsystem-2.0.1
> Environment: linux windows java
> Reporter: Bas
> Assignee: John Ross
> Labels: patch, performance
> Fix For: subsystem-core-1.2.0, subsystem-2.0.1
>
> Attachments: patch-basicsubsystem.patch,
> performance-105-afterrestart.nps, subsystem-basicsubsystem-patch.txt
>
>
> The problem was poor performance while installing a subsystem on a container
> with 200+ subsystems installed.
> While doing performance analyses on the subsystem install process we noticed
> the BasicSubsystem is working a lot with its manifest instead of
> pre-calculating data that is used a lot.
> While using the pre-patch version of BasicSubsystem a subsystem install
> (while having 200+ running subsystems) could take more than a minute. While
> using the patched version where we pre-calculate highly used data when a new
> subsystem manifest or deployment manifest is set we could bring it down to 10
> seconds. We only pre-calculated the data that was highly used.
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