[SR-Users] htable size

[Henning Westerholt]

On Monday 26 April 2010, Alex Balashov wrote:
> > i think this is a static setting, as the memory is allocated on startup
> > in shared memory. Do you've run into performance problems or memory size
> > constraints with the htable module?
> 
> None whatsoever, I was just curious from a theoretical perspective.
> 
> The answer lets me know in an a priori way whether the htable is optimal
> for applications involving rapidly shrinking or contracting data sets,
> by several factors.

There is probably a certain point on which further increase of the htable size 
make not that much sense anymore. It seems the module only supports from 256 
to 16384 buckets in the htable. So depending on the distribution of the hash 
function the htable will start to degenerate, up to a worst case complexity to 
O(n). The used function is core_case_hash from hash_func.c

Regards,

Henning