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From "Suraj Pindoria (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CB-13559) Poor performance and crashes marshalling large ArrayBuffers from JS to Native side on iOS
Date Fri, 10 Nov 2017 18:52:00 GMT

    [ https://issues.apache.org/jira/browse/CB-13559?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16247907#comment-16247907
] 

Suraj Pindoria commented on CB-13559:
-------------------------------------

Was this tested only on the simulator or on an actual device as well? The simulator does not
provide accurate performance benchmarks so that may also be why you are seeing this.

> Poor performance and crashes marshalling large ArrayBuffers from JS to Native side on
iOS
> -----------------------------------------------------------------------------------------
>
>                 Key: CB-13559
>                 URL: https://issues.apache.org/jira/browse/CB-13559
>             Project: Apache Cordova
>          Issue Type: Bug
>          Components: cordova-ios
>    Affects Versions: cordova-ios@4.4.0, cordova-ios@4.3.0, cordova-ios 4.5.0
>         Environment: iOS 10.3 Simulator
> Using cordova-plugin-wkwebview-engine
>            Reporter: Tim Hambourger
>            Assignee: Suraj Pindoria
>            Priority: Critical
>         Attachments: iOS Exec timeline.png
>
>
> I'm doing performance analysis on an application that's attempting to write an approx.
10 MB Blob to disk using the File plugin. The uint8ToBase64 function called by iOSExec looks
like a particular bottleneck. I'm seeing large memory increases followed by GCs taking approx
1.5 secs. The attached screenshot has a typical Safari timeline.
> After some initial testing, it looks like re-implementing uint8ToBase64 using String.fromCharCode
and window.btoa, rather than string appending, might yield some improvements. Some alternate
implementations at [https://github.com/github-tools/github/issues/137] and [https://stackoverflow.com/questions/9267899/arraybuffer-to-base64-encoded-string].
> Is this something you would consider taking a look at? We're also weighing strategies
to reduce our file size and the frequency of our writes, but a platform-level fix would be
a huge help.



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