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https://issues.apache.org/jira/browse/FELIX-2721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12974344#action_12974344
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Richard S. Hall commented on FELIX-2721:
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I've committed an initial patch for this, but I am leaving it open for now in
case we think of any other optimizations.
> [Framework] Implement custom manifest parser and avoid JarFile
> --------------------------------------------------------------
>
> Key: FELIX-2721
> URL: https://issues.apache.org/jira/browse/FELIX-2721
> Project: Felix
> Issue Type: Improvement
> Affects Versions: framework-3.0.6
> Reporter: Richard S. Hall
> Priority: Minor
> Fix For: framework-3.0.7
>
>
> In previous performance tuning work, I noticed that JarFile consumes a lot of
> memory, particularly due to the use of JarFile.getManifest(). This caches the
> manifest, perhaps the entire manifest, which is unnecessary for OSGi since we
> only use the main attributes. At the time I wasn't trying to address memory
> consumption, but speed and this didn't appear to improve it. However, now I
> have received reports of memory consumption issues in the field from people
> trying to use the Felix framework on embedded devices.
> After having sent a patch framework with custom manifest parsing, I have
> reports of considerable decreases in memory consumption. I think it makes
> sense to make this change. To avoid indirectly reading the manifest, we will
> need to avoid using JarFile altogether, since it will implicitly read the
> manifest and cache it during some operations.
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