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From "Peter Lawrey (JIRA)" <j...@apache.org>
Subject [jira] Updated: (FELIX-2436) Reduce the number files created by the fileinstall Scanner.
Date Tue, 22 Jun 2010 15:57:57 GMT

     [ https://issues.apache.org/jira/browse/FELIX-2436?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Peter Lawrey updated FELIX-2436:
--------------------------------

    Attachment: reduce_object_construction.patch

patch of changes to reduce object allocation.

> Reduce the number files created by the fileinstall Scanner.
> -----------------------------------------------------------
>
>                 Key: FELIX-2436
>                 URL: https://issues.apache.org/jira/browse/FELIX-2436
>             Project: Felix
>          Issue Type: Improvement
>          Components: File Install
>    Affects Versions: fileinstall-2.0.8
>            Reporter: Peter Lawrey
>         Attachments: reduce_object_construction.patch
>
>
> The fileinstaller is called regularly and there can be two or more instances in a server.
> However its object allocation doesn't considered that 99.999+% of the time none of the
files change. 
> (polling one per second and changing files once per day is means the file installer will
see a change 0.001% of the time)
> In our application, polling every second results in the Scanner creating more objects
than the application itself. We can turn down the polling rate but even at once every 10s
it creates more objects than any other component!
> For this reason I have changed the Scanner to first check whether any files have changed
attempting to compute what has changed.
> See atached for a patch of the changes.  This reduces the number of obejcts created by
atleast a factor of 3.

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