Use atomic ops to hand out pages to scan in parallel scan. With a lot of CPUs, the spinlock that protects the current scan location in a parallel scan can become a bottleneck. Use an atomic fetch-and-add instruction instead.
David Rowley Discussion: https://www.postgresql.org/message-id/cakjs1f9tgsphqbcopjv9_kupzvtlcz4jy%3db%3dbhqgakn7cyz...@mail.gmail.com Branch ------ master Details ------- https://git.postgresql.org/pg/commitdiff/3cda10f41bfed7e34b0db7013b66dd40a5f75926 Modified Files -------------- src/backend/access/heap/heapam.c | 102 ++++++++++++++++++++++----------------- src/include/access/relscan.h | 5 +- 2 files changed, 62 insertions(+), 45 deletions(-) -- Sent via pgsql-committers mailing list (pgsql-committers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-committers
