Hello everyone, I'm implementing a CUDA based sorting on PostgreSQL, and I believe it can improve the ORDER BY statement performance in 4 to 10 times. I already have a generic CUDA sort that performs around 10 times faster than std qsort. I also managed to load CUDA into pgsql.
Since I'm new to pgsql development, I replaced the code of pgsql qsort_arg to get used with the way postgres does the sort. The problem is that I can't use the qsort_arg_comparator comparator function on GPU, I need to implement my own. I didn't find out how to access the sorting key value data of the tuples on the Tuplesortstate or SortTuple structures. This part looks complicated because it seems the state holds the pointer for the scanner(?), but I didn't managed to access the values directly. Can anyone tell me how this works? Cheers, Vítor -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
