Dear GAP Forum,
Rober Heffernan wrot:
I'm computing the automorphism groups of finite groups
(particularly,finite perfect groups) but GAP seems to be taking an
awful long timeto do this.
For example, the following has been running for several hours now:
A:=AutomorphismGroup(PerfectGroup(168,1));
The machine I am running this on is quite decently specced. Also,
Istarted gap with the following:gap -o 1000Mto give GAP plenty of
memory to work with.
PerfectGroup returns by default a finitely presented group. An
automorphism group calculation for these is likely to be very
inefficient. If you use a permutation representation instead you are
likely to get a much better performance:
A:=AutomorphismGroup(PerfectGroup(IsPermGroup,168,1));
Best wishes,
Alexander Hulpke
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