Explain `Error, reached the pre-set memory limit`

[ssiccha]

Error, reached the pre-set memory limit                                             
(change it with the -o command line option) in                                      
  res[Length( C )] := 1; at /home/sergio/projects/gap-master/lib/coll.gi:742 called from                                                                                 
<function "List">( <arguments> )                                                    
 called from read-eval loop at *stdin*:4                                            
you can 'return;'                                                                   
brk>

• return; continues the execution
• use -o in advance <= it may happen that GAP goes out of its way to not extend the workspace and this can slow it down