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From "wei zhang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CB-8916) Huge memory consumption in iOS 8 with compass plugin when filter parameter is not specified
Date Mon, 27 Apr 2015 10:21:39 GMT
wei zhang created CB-8916:
-----------------------------

             Summary: Huge memory consumption in iOS 8 with compass plugin when filter parameter
is not specified
                 Key: CB-8916
                 URL: https://issues.apache.org/jira/browse/CB-8916
             Project: Apache Cordova
          Issue Type: Bug
          Components: iOS
    Affects Versions: 3.7.0
         Environment: Cordova iOS 3.7.0
JQuery Mobile 1.3.2
iOS 8
            Reporter: wei zhang


Hi, I found a bug that occurs if the filter parameter is not specified. It triggers a large
memory consumption in the app and ultimately the app will not respond to user input. 

My function tracks the direction for a list of places, and updates the heading in real time
(one for each place). The code below is my function. When I tested my app(built against iOS
8 SDK) on both iOS(iPhone5 iOS8) emulator and iPhone 6(iOS 8.0.2), the memory consumption
increased significantly when the function was called. The app failed to respond after about
1 minute 40 seconds, and the memory usage was around 270 mb(I was monitoring in XCode). The
console log Compass Count indicates that the app usually dies when count reaches around 960.


The issue occurs when the app is built against iOS SDK 8.1. However the same code runs fine
in the app when it is built against iOS 7 SDK (there is no noticeable increase in memory consumption).


Could you please look into this? Thanks

function activateCompass(frequency, callback){

                var frequency = frequency || 100;
                console.log("frequency is " + frequency);

                var options = { frequency: frequency};
                compassHeading = navigator.compass.watchHeading(
                                function compassSuccess(heading) {
                                                console.log('Compass Count: ' + compassCounter++);
                                                callback(heading.magneticHeading);
                                },
                                function compassError(compassError){
                                                console.log('Compass error: ' + compassError.code
+ ' Counter is ' + compassCounter++);
                                },
                                options
                );




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