I'm getting a memory error running parallelHF on Ranger. Is this a bug or is there some sort of way to request more memory in my job script?

Here is the full traceback:

Traceback (most recent call last): File "sim_halo_profiler.py", line 17, in <module> rearrange=True, safety=1.5, fancy_padding=True) File "/share/home/01078/tg803421/yt-x86_64/lib/python2.6/site-packages/yt-2.1stable-py2.6-linux-x86_64.egg/yt/analysis_modules/halo_finding/halo_objects.py", line 1921, in init threshold=threshold, dm_only=dm_only, rearrange=rearrange, premerge=premerge) File "/share/home/01078/tg803421/yt-x86_64/lib/python2.6/site-packages/yt-2.1stable-py2.6-linux-x86_64.egg/yt/analysis_modules/halo_finding/halo_objects.py", line 1368, in init HaloList.init(self, data_source, dm_only) File "/share/home/01078/tg803421/yt-x86_64/lib/python2.6/site-packages/yt-2.1stable-py2.6-linux-x86_64.egg/yt/analysis_modules/halo_finding/haloobjects.py", line 992, in _init self._run_finder() File "/share/home/01078/tg803421/yt-x86_64/lib/python2.6/site-packages/yt-2.1stable-py2.6-linux-x86_64.egg/yt/analysis_modules/halo_finding/halo_objects.py", line 1389, in _run_finder self.threshold, rearrange=self.rearrange, premerge=self.premerge) File "/share/home/01078/tg803421/yt-x86_64/lib/python2.6/site-packages/yt-2.1stable-py2.6-linux-x86_64.egg/yt/analysis_modules/halo_finding/parallel_hop/parallel_hop_interf ace.py", line 68, in init__ yt : [INFO ] 2011-05-13 11:42:17,599 Building kd tree for 9519616 particles... self._chain_hop() File "/share/home/01078/tg803421/yt-x86_64/lib/python2.6/site-packages/yt-2.1stable-py2.6-linux-x86_64.egg/yt/analysis_modules/halo_finding/parallel_hop/parallel_hop_interf ace.py", line 1428, in _chain_hop self._chain_hop() File "/share/home/01078/tg803421/yt-x86_64/lib/python2.6/site-packages/yt-2.1stable-py2.6-linux-x86_64.egg/yt/analysis_modules/halo_finding/parallel_hop/parallel_hop_interf ace.py", line 1428, in _chain_hop self._init_kd_tree() File "/share/home/01078/tg803421/yt-x86_64/lib/python2.6/site-packages/yt-2.1stable-py2.6-linux-x86_64.egg/yt/analysis_modules/halo_finding/parallel_hop/parallel_hop_interf ace.py", line 347, in _init_kd_tree fKD.pos = na.asfortranarray(na.empty((3, self.size), dtype='float64')) self._init_kd_tree() File "/share/home/01078/tg803421/yt-x86_64/lib/python2.6/site-packages/yt-2.1stable-py2.6-linux-x86_64.egg/yt/analysis_modules/halo_finding/parallel_hop/parallel_hop_interf ace.py", line 347, in _init_kd_tree MemoryError fKD.pos = na.asfortranarray(na.empty((3, self.size), dtype='float64'))

File "/share/home/01078/tg803421/yt-x86_64/lib/python2.6/site-packages/numpy/core/numeric.py", line 408, in asfortranarray return array(a, dtype, copy=False, order='F', ndmin=1) MemoryError