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%3DbhqgaKn7cYzm-w@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(-)
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