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From "Justin Mclean (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (FLEX-33865) ConstraintLayout / LayoutElementHelper are memory inefficient (and slow)
Date Mon, 04 Nov 2013 06:03:17 GMT

     [ https://issues.apache.org/jira/browse/FLEX-33865?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Justin Mclean updated FLEX-33865:

    Attachment: layout_performance.patch

I think we can all agree that the contents of this patch improves performance and can be checked
in. It includes all changes except reusing the array. (BTW  [] is faster and preferred over
new Array() so I changed it to be that).

Benoit can you come up with a simple app that shows how the array changes improves GC? It
certainly sounds like a reasonable assumption to me, but sometimes when testing performance
issues you find unexpected things. As this class is used in layouts it does have a large knock
on effect so it's best to make sure and double check this.

Thanks again for the patch, it improves layout performance which improves all layouts and
not just mobile case you were investigating. I know this is taking some time to get into the
SDK but we want to get it right.

> ConstraintLayout / LayoutElementHelper are memory inefficient (and slow)
> ------------------------------------------------------------------------
>                 Key: FLEX-33865
>                 URL: https://issues.apache.org/jira/browse/FLEX-33865
>             Project: Apache Flex
>          Issue Type: Improvement
>          Components: Mobile: Performance, Spark: Layout
>    Affects Versions: Apache Flex 4.11.0
>         Environment: mobile desktop
>            Reporter: Benoit Wiart
>            Assignee: Maurice Amsellem
>              Labels: mobile, performance
>         Attachments: 0001-ConstraintLayout-optimizationsV2.patch, desktopafter.png, desktopbefore.png,
layout-1-desktop-memory.png, layout-2-desktop-memory.png, layout-3-mobile-memory.png, layout_performance.patch
> ConstraintLayout / LayoutElementHelper are doing too many memory allocation.
> it's really bad on mobile
> the attached screenshots were taken on desktop

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