Re: [Lzip-bug] lzip memory & performance issue

[Antonio Diaz Diaz]

address@hidden wrote:
> However, the lzip manual says:
>   "Note that dictionary sizes are quantized. If the specified size does
> not match one of the valid sizes, it will be rounded upwards."
>
> What are the relevant sizes that the dictionary is quantized to? Could
> lzip have been trying to use a much larger dictionary size when I
> specified 256MiB?

As you can see here[1], dictionary sizes that are a power of two are 
coded exactly. So lzip uses exactly 256MiB when you specify 256MiB. For 
other values, lzip divides the space between any two powers of two in 16 
intervals of equal size (wedges). For example, any value between 249MiB 
and 255MiB will be rounded upwards to 256MiB.
[1] http://www.nongnu.org/lzip/manual/lzip_manual.html#File-Format

Thanks for telling me about this. I'll try to explain it more clearly in 
the next version of the manual.


Regards,
Antonio.