Error'' Killed'' in LLC4320

[neshghi]

Hi All,
I want to make the input files from LLC4320 data with the file format of '*.nc' for the Persian Gulf. I know this area located in face # 2 and face # 5. I want to get the data for these faces, link together then separate the Persian Gulf area from that.
for the first step, I use following lines:

from xmitgcm import llcreader

model = llcreader.ECCOPortalLLC4320Model()
ds = model.get_dataset(varnames=['Eta'],iter_start=13680,iter_stop=13681,k_chunksize=90)
ds.sel(face=2).to_netcdf('my_file.nc')

but after a few minuets, I have the error as '' Killed'' , so I cannot get the completed file. How can I figure out this problem?
I would be thankful if you helped me about this matter.