Robert,
1. How much we're paying for this in the uncontended case?
Using glibc, we have the overhead of an additional library function call, which we could eliminate by pulling in the code from glibc/nptl or a source of other proven reference code.
The pgbench results I had posted before http://archives.postgresql.org/pgsql-hackers/2012-07/msg00061.php could give an indication on the higher base cost for the simple approach.
I have mentioned this before: While I agree that minimizing the base overhead is good, IMHO, optimizing the worst case is the important part here.
Nils -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
