Thanks for the advice. I somehow had inferred from the man page that 512M was the default. In any event, it doesn't move the needle on compression ratio.

Doug

On Tue, Mar 11, 2025 at 10:47 AM Jeff Johnson <trnsz@pobox.com> wrote:

As far as getting maximum compression from lzip, `lzip -9 -s 512Mi`
is usually the preferred invocation. I think the default dictionary
size at -9 is 64MiB, but that's not that relevant I guess, unless
we are comparing different methods and trying to see about what
ratios different algorithms get at similar memory usage.

--
Jeffrey H. Johnson
trnsz@pobox.com

On Mon, Mar 10, 2025, at 8:23 PM, Douglas McIlroy wrote:
> Gnu lzip -9 got a 3.92 compression factor , while Morris-Thompson got 4.52.

--
Jeffrey H. Johnson
trnsz@pobox.com

On Mon, Mar 10, 2025, at 8:23 PM, Douglas McIlroy wrote:
> Gnu lzip -9 got a 3.92 compression factor , while Morris-Thompson got 4.52.