Memory leak in the tiler

[ppawel]

OOM killer kicked in again tonight... Some logs:

D, [2013-01-04T02:44:57.257553 #7989] DEBUG -- : W 152813734 (2)
D, [2013-01-04T02:44:57.280255 #7989] DEBUG -- :   tile_count = 2147504146
D, [2013-01-04T02:55:37.107015 #7989] DEBUG -- :   tiles_to_check = 1126144
D, [2013-01-04T03:01:23.219906 #7989] DEBUG -- :   Processing 2252464 tile(s)...

And then it's dead.

[ppawel]

I think it is not really this specific changeset (although it is huge) but some kind of memory leak in the tiler. When it runs on zark through the night you can clearly see memory used growing and growing until the OOM killer kills the tiler.

http://munin.openstreetmap.org/openstreetmap/zark.openstreetmap/memory.html

Not sure what this could be. GEOS objects seem to be automatically released. What else could it be? Need to investigate further.

Tried using heap_dump gem to check the heap contents but it requires Ruby newer than zark's 1.9.1...