From the mailing lists ...
> I have been using diffseq to compare too strains of the same bacteria
> species using "10" as wordsize without any problem.
>
> However, when I try to reduce this number to "4", after several hours of
> calculation the server collapses, all RAM and SWAP are used.
>
> Is there any option to avoid that, or do you know if someone is working
> on that problem?
Meanwhile, we will take a look at diffseq in case there is some way to
improve its performance or to warn an early stage if the word size
appears small for the input sequence lengths and may generate too many
matches.