Re: WIP: shared ispell dictionary

Pavel Stehule wrote:
> attached patch add possibility to share ispell dictionary between
> processes. The reason for this is the slowness of first tsearch query
> and size of allocated memory per process. When I tested loading of
> ispell dictionary (for Czech language) I got about 500 ms and 48MB.
> With simple allocator it uses only 25 MB. If we remove some check and
> tolower string transformation from loading stage it needs only 200 ms.
> But with broken dict or affix file it can put wrong results. This
> patch significantly reduce load on servers that use ispell
> dictionaries.
>
> I know so Tom worries about using of share memory. I think so it
> unnecessarily. After loading data from dictionary are only read, never
> modified. Second idea - this dictionary template can be distributed as
> separate project (it needs a few changes in core - and simple
> allocator).

Fixed-size shared memory blocks are always problematic. Would it be
possible to do the preloading with shared_preload_libraries somehow?

--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com