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Date: Fri, 10 Nov 2017 21:39:00 +0000 (UTC)
From: "Suraj Pindoria (JIRA)" <jira@apache.org>
To: issues@cordova.apache.org
Message-ID: <JIRA.13117420.1510266933000.210042.1510349940277@Atlassian.JIRA>
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Subject: [jira] [Commented] (CB-13559) Poor performance and crashes
 marshalling large ArrayBuffers from JS to Native side on iOS
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archived-at: Fri, 10 Nov 2017 21:39:08 -0000


    [ https://issues.apache.org/jira/browse/CB-13559?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16248055#comment-16248055 ] 

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

Ok cool, I'll take a look into 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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