[jira] Resolved: (HARMONY-5281) [drlvm][startup][performance][classloader] mapping bootstrap jars directly into memory

["Pavel Pervov (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HARMONY-5281?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Pavel Pervov resolved HARMONY-5281.
-----------------------------------

    Resolution: Fixed

Committed revision 641169.

VM option vm.map_bootstrap_jars can be used to turn mmap functionality on.

> [drlvm][startup][performance][classloader] mapping bootstrap jars directly into memory
> --------------------------------------------------------------------------------------
>
>                 Key: HARMONY-5281
>                 URL: https://issues.apache.org/jira/browse/HARMONY-5281
>             Project: Harmony
>          Issue Type: Sub-task
>          Components: DRLVM
>            Reporter: Naumova Natalya 
>            Assignee: Pavel Pervov
>         Attachments: bootstrap_jar_mapping.patch, jarmapping.BCP.patch
>
>
> Bootstrap jar files mapping : we can deliver from a big amount of system calls (such as lseek, read etc) by mapping jars into memory via CreateFileMapping for windows and nmap for linux. Then we can work using pointer arithmetic only. 
> The same can be done with classlib jars also..

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