On Mon, Nov 30, 2015 at 4:52 PM, Robert Haas <robertmh...@gmail.com> wrote: > Not only does this build only one copy of the hash table instead of N > copies, but we can parallelize the hash table construction itself by > having all workers insert in parallel, which is pretty cool.
Hm. The case where you don't want parallel building of the hash table might be substantially simpler. You could build a hash table and then copy it into shared memory as single contiguous read-only data structure optimized for lookups. I have an inkling that there are even ways of marking the memory as being read-only and not needing cache synchronization. -- greg -- Sent via pgsql-hackers mailing list (email@example.com) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers