How to deal with "GAPError: Error, reached the pre-set memory limit" ?

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I get the following error while doing group theoretic computations in Sage:

GAPError: Error, reached the pre-set memory limit
(change it with the -o command line option)

How overcome it by allowing GAP use more memory? Where exactly I should use -o option?

Here is a code producing an error:

def a138077_q(q): G = PSL(3, q); d = G.order(); return d // max(H.order() for H in G.conjugacy_classes_subgroups() if H.order()<d)
print(a138077_q(13))