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https://issues.apache.org/jira/browse/CB-13559?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16246686#comment-16246686
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Tim Hambourger commented on CB-13559:
-------------------------------------
FYI, the alternate implementation I've tested so far:
var CHUNK_SIZE = 0xffff;
function uint8ToBase64 (rawData) {
var strArray = [];
for (var i = 0; i * CHUNK_SIZE < rawData.length; i++) {
strArray.push(String.fromCharCode.apply(null, rawData.subarray(i *
CHUNK_SIZE, (i + 1) * CHUNK_SIZE)));
}
return window.btoa(strArray.join(''));
}
> 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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