[jira] Updated: (HARMONY-6039) Implement on-demand class library parsing to avoid unnecessary jar/zip parsing during startup

["Wenlong Li (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HARMONY-6039?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wenlong Li updated HARMONY-6039:
--------------------------------

    Attachment: On-demand runtime library loading_1

Move all updates to VM side to clear the possible modularity issue.

> Implement on-demand class library parsing to avoid unnecessary jar/zip parsing during startup
> ---------------------------------------------------------------------------------------------
>
>                 Key: HARMONY-6039
>                 URL: https://issues.apache.org/jira/browse/HARMONY-6039
>             Project: Harmony
>          Issue Type: Improvement
>          Components: VM
>         Environment: Conduct experiments on Windows XP, Core 2 Quad-core machine
>            Reporter: Wenlong Li
>            Assignee: Xiao-Feng Li
>         Attachments: H6039_on_demand_library_parsing_patch, instrumentation_code, On-demand runtime library loading_1, on_demand_patch
>
>
> During VM creation, Harmony will parse all class libraried defined in bootclasspath.properties under jre/lib/boot directory. However, not all class libraries are accessed during startup. That means, it is not necessary to open and resolve all these class libraries.
> In this patch, I implement the on-demand jar parsing. I leverage the class library info defined in the manifest file of each module. For a request class, if it is not available in existing class table, I then parse its class library info, and check which module contains this requested class. That is, I parse the class library on demand.
> Using on-demand class library parsing, I can reduce the VM creation time from 20+ seconds to 3 seconds.
> I enable this feature into reading boot class path option, and it can be disabled by using -Xbootclasspath option. 

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