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Use atomic ops to hand out pages to scan in parallel scan.

author Heikki Linnakangas <heikki.linnakangas@iki.fi>

2017年8月16日 13:18:41 +0000 (16:18 +0300)

committer Heikki Linnakangas <heikki.linnakangas@iki.fi>

2017年8月16日 13:18:41 +0000 (16:18 +0300)

commit 3cda10f41bfed7e34b0db7013b66dd40a5f75926

tree 4ff54d4f5050da1b2b5b58dc277716b93f21d9be tree

parent 0c504a80cf2e6f66df2cdea563e879bf4abd1629 commit | diff

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

src/backend/access/heap/heapam.c diff | blob | blame | history

src/include/access/relscan.h diff | blob | blame | history

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