* Too Many Timers (what is the limit?)
*Too Many Arguments (is 9 the limit?)
I know this isn't exhaustive, eg. Too Many Objects Error
I hear what you say about multi-dimensional arrays, even if I don't understand the why!
var array = new [100];
for (var i = 0; i < 100; ++i) {
array= new [2];
for (var j = 0; j < 2; ++j) {
array[j] = i * 100 + j;
}
}
[/code]
This makes a 2x100 array (2 cols, 100 rows). The outer object, named array is a reference-counting handle to an actual array implementation that is allocated on the heap. That implementation object has a reference count, and 100 handles. Each of those handles reference another array implementation, each with their own reference count and 2 handles. So, for an outer array with N elements, you have N reference counts that you don't need, and those take up space.
how can I use the stats object to accurately predict when my app is about to crash with an Out of Memory error?
I'm sorry, I don't know the answer to this. Obviously, if your app reaches the situation where the amount of contiguous free memory is less than the system requires, you're going to get a crash. Theoretically as the heap gets fragmented, that can cause problems where memory is available, but can't be used as it isn't contiguous. How to avoid this would depend on how the heap is implemented, but if you can allocate your memory in large blocks and re-use it, that would be good.
Travisvar tracks = new [500];
for (var i=0; i<500; i++){ //
tracks= [
12345,
-33.234,
155.123,
5.4,
123
];
System.println(i+ ", "+ System.getSystemStats().usedMemory+
", "+ System.getSystemStats().freeMemory+
", "+ System.getSystemStats().totalMemory);
}[/CODE]
It reports as follows:
....
461, Used:62160, Free: 62960
462, Used:62208, Free: 62912
463, Used:62256, Free: 62864
Failed invoking <symbol>
Out Of Memory Error
Note, it's still reporting 62864 free when it crashes.
When I limit the loop to i<=463, the app starts and the simulator reports Mem:46.2/122kB, Peak:61.2kB (but crashes after a couple of minutes simulating data with too many objects error)
So, what is going on? Is it memory fragmentation?
How can I manage that?