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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