| From: | Heikki Linnakangas <heikki(dot)linnakangas(at)iki(dot)fi> |
|---|---|
| To: | pgsql-committers(at)postgresql(dot)org |
| Subject: | pgsql: Use atomic ops to hand out pages to scan in parallel scan. |
| Date: | 2017-08-16 13:19:41 |
| Message-ID: | E1dhyEX-0002H9-Ku@gemulon.postgresql.org |
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| Lists: | pgsql-committers |
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
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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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