harmony-commits mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Wenlong Li (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HARMONY-6039) Implement on-demand class library parsing to avoid unnecessary jar/zip parsing during startup
Date Wed, 10 Dec 2008 04:06:44 GMT

    [ https://issues.apache.org/jira/browse/HARMONY-6039?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12655089#action_12655089
] 

Wenlong Li commented on HARMONY-6039:
-------------------------------------

In this patch, I introduce another property file, which defines mappting between module and
its class library. These info is extracted from the manifest in each module. 


> 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
>         Attachments: 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. 

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.


Mime
View raw message