[jira] [Created] (CB-13559) Poor performance and crashes marshalling large ArrayBuffers from JS to Native side on iOS

["Tim Hambourger (JIRA)" <ji...@apache.org>]

Tim Hambourger created CB-13559:
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             Summary: 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 4.5.0, cordova-ios@4.3.0, cordova-ios@4.4.0
         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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