#164 Out of Memory

[Jean-Pierre DUVAL]

On Ubuntu 10.10 with Open JDK 6 for Mobile_Atlas_Creator 1.8, I tried to make a map of France for AlpineQuest (AQM) from Mapnik map source.

I used a several steps process :
1) I modifiy the settings of Mobile_Atlas_Creator in order not to download map tiles newer than three months ; adjust map tiles ; use of 15 threads ; no automatically continue after download errors.
2) I also use sqlitejdbc-v056.jar.
2) For each layer, I wrote an Xml file and I run Mobile_Atlas_Creator with success.
It took many days.
3) Then I merge all Xml files into a unique one in order to have a unique map with different layers and specific ones on some areas. See the profile in attachment.
4) I ran the following command with the all xml profile :

java -Xms64m -Xmx512M -jar Mobile_Atlas_Creator.jar &

The process aborted after hours at around 40 % due to an out of memory error. See the log below. It is the same if I increase the memory maximum:

java -Xms64m -Xmx1024M -jar Mobile_Atlas_Creator.jar &

ERROR - Error in createMap: Java heap space
java.lang.OutOfMemoryError: Java heap space
at java.util.Arrays.copyOf(Arrays.java:2894)
at java.lang.AbstractStringBuilder.expandCapacity(AbstractStringBuilder.java:117)
at java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:407)
at java.lang.StringBuffer.append(StringBuffer.java:241)
at mobac.program.atlascreators.impl.aqm.FlatPackCreator.add(FlatPackCreator.java:94)
at mobac.program.atlascreators.AlpineQuestMap.addLevelTiles(AlpineQuestMap.java:382)
at mobac.program.atlascreators.AlpineQuestMap.createMap(AlpineQuestMap.java:313)
at mobac.program.AtlasThread.createMap(AtlasThread.java:312)
at mobac.program.AtlasThread.createAtlas(AtlasThread.java:169)
at mobac.program.AtlasThread.run(AtlasThread.java:106)
ERROR - Out of memory:
java.lang.OutOfMemoryError: Java heap space
at java.util.Arrays.copyOfRange(Arrays.java:3221)
at java.lang.String.<init>(String.java:233)
at java.lang.StringBuffer.toString(StringBuffer.java:602)
at mobac.program.atlascreators.impl.aqm.FlatPackCreator.close(FlatPackCreator.java:129)
at mobac.program.atlascreators.AlpineQuestMap.abortAtlasCreation(AlpineQuestMap.java:152)
at mobac.program.AtlasThread.createAtlas(AtlasThread.java:195)
at mobac.program.AtlasThread.run(AtlasThread.java:106)</init>

[Jean-Pierre DUVAL]

mobac-profile-all.xml

[r_x]

I am sorry but I can not help you. The implementation of AlpineQuest (AQM) requires to keep a lot in memory - this is why you get the error.

Additionally there is the problem that I did not wrote the AQM atlas creator implementation - I got it from an external developer and only integrated it into MOBAC.

Therefore just use smaller atlases or increase the memory for MOBAC. I don't see an alternative.

BTW: The atlas you posted is very large and will not be usable in the current version of MOBAC. The limit has been reduced to 500000 tiles per atlas.