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From "Wenlong Li (JIRA)" <j...@apache.org>
Subject [jira] Created: (HARMONY-6039) Implement on-demand class library parsing to avoid unnecessary jar/zip parsing during startup
Date Wed, 10 Dec 2008 03:16:44 GMT
Implement on-demand class library parsing to avoid unnecessary jar/zip parsing during startup
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                 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


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, we implement the on-demand jar parsing. We 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, we then parse its class library info, and check which module contains
this requested class. That is, we parse the class library on demand.

Using on-demand class library parsing, we can reduce the VM creation time from 20+ seconds
to 3 seconds.

We enable this feature into reading boot class path option, and it can be disabled by using
-Xbootclasspath option. 

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