Thanks Arothian. I guess it's not a 'true' memory leak, in the sense that it does seem to get reclaimed eventually. It's just that it's allocating more memory than I would expect just to move a marker, and I would expect that touching that much memory would impact performance.
As a test I've tried moving 10 markers dynamically, and memory increases at around 5MB per second, but is reclaimed every 10 seconds or so. This has a noticeable effect on performance though. I've read that it's best to avoid relying on the garbage collection, and instead reuse/recycle objects as much as possible. My initial code moved the marker by allocating a new LatLng on each frame. For my test code above I wanted to eliminate any allocations in my code, but since a LatLng can't be changed after construction, I had to set the position to a fixed location instead. A single LatLng shouldn't use much memory (I presume it's just 16 bytes plus some overhead), but I guess Marker.setLatLng() is allocating a lot of temporary objects internally. Anyway, I am going to try building a custom overlay as described at http://groups.google.com/group/google-maps-api-for-flash/browse_thread/thread/52dc36c1a82ba119/22324304b29a1aed, which will hopefully give me better control over the memory use. Thanks, Saxon On Mar 27, 3:34 am, Arothian <[email protected]> wrote: > Memory leaks are pretty hard to detect in flex. I would be concerned > if the memory continued to leak after a significant time duration. > Flex's garbage collection only happens during the allocation phase. > > See the following link for more info on gc in flex: > > http://blogs.adobe.com/aharui/2007/03/garbage_collection_and_memory.html > > On Mar 26, 10:41 am, Saxon <[email protected]> wrote: > > > > > Thanks Pamela. > > > It's compiled with a target frame rate of 30 fps, and I was just using > > task manager. > > > It seems to be a bit unpredictable - today it is working fine for me > > in FF3, but I still get the problem in IE7. > > > I've uploaded it tohttp://test.saxon.cx/test1/incase it's a > > difference in compilation settings. The source there contains a > > FlashDevelop 3.00 RC2 project. > > > According > > tohttp://kb.adobe.com/selfservice/viewContent.do?externalId=tn_15507 > > I have version 10.0.22.87 of Flash (non-debug). > > > The memory does seem to be reclaimed every so often, after about 30 to > > 75 MB has been allocated. It might just be that the garbage collector > > isn't working very well, but 500k per second at 30fps = about 16k > > allocated per marker move, which seems like a lot? > > > Thanks, > > Saxon > > > On Mar 26, 12:00 am, pamela fox <[email protected]> wrote: > > > > Hi Saxon- > > > I'm running that code in FF3 on Windows, and am not seeing any significant > > > increased memory usage using Windows Task Manager. > > > > How are you monitoring the memory, and should I be doing something > > > particular to run this at 30 FPS? > > > > - pamela > > > > On Tue, Mar 24, 2009 at 12:38 AM, Saxon <[email protected]> wrote: > > > > > Hi, > > > > > I want to be able to move a marker dynamically, but calling > > > > Marker.setLatLng() seems to leak memory when I call it repeatedly. > > > > > The following cut down example mxml leaks about 500k per second, when > > > > run at 30fps: > > > > > <?xml version="1.0" encoding="utf-8"?> > > > > <mx:Application > > > > xmlns:mx="http://www.adobe.com/2006/mxml"; > > > > layout="absolute" > > > > enterFrame="onEnterFrame(event)"> > > > > <maps:Map > > > > xmlns:maps="com.google.maps.*" > > > > id="map" > > > > mapevent_mapready="onMapReady(event)" > > > > mapevent_mappreinitialize="onMapPreinitialize(event)" > > > > width="640" > > > > height="480" > > > > key="my-api-key"/> > > > > <mx:Script> > > > > <![CDATA[ > > > > import com.google.maps.LatLng; > > > > import com.google.maps.MapType; > > > > import com.google.maps.MapOptions; > > > > import com.google.maps.overlays.Marker; > > > > > private var marker:Marker = null; > > > > > private var mapCentre:LatLng = new > > > > LatLng(-33.8804, > > > > 151.1912); > > > > > private function > > > > onMapPreinitialize(event:Event):void > > > > { > > > > var mapOptions:MapOptions = new > > > > MapOptions(); > > > > mapOptions.zoom = 20; > > > > mapOptions.center = mapCentre; > > > > mapOptions.mapType = > > > > MapType.SATELLITE_MAP_TYPE; > > > > this.map.setInitOptions(mapOptions); > > > > } > > > > > private function onMapReady(event:Event):void > > > > { > > > > marker = new Marker(mapCentre); > > > > this.map.addOverlay(marker); > > > > } > > > > > private function onEnterFrame(event:Event):void > > > > { > > > > if (marker != null) > > > > marker.setLatLng(mapCentre); > > > > } > > > > ]]> > > > > </mx:Script> > > > > </mx:Application> > > > > > The leak occurs in both IE7 and firefox 3. > > > > > Is it something I am doing wrong? > > > > > Thanks, > > > > Saxon- Hide quoted text - > > > > - Show quoted text -- Hide quoted text - > > - Show quoted text - --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Google Maps API For Flash" group. 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