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Use condition variables to wait for checkpoints.

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Previously we used a polling/sleeping loop to wait for checkpoints
to begin and end, which leads to up to a couple hundred milliseconds
of needless thumb-twiddling.  Use condition variables instead.

Author: Thomas Munro
Reviewed-by: Andres Freund
Discussion: https://postgr.es/m/CA%2BhUKGLY7sDe%2Bbg1K%3DbnEzOofGoo4bJHYh9%2BcDCXJepb6DQmLw%40mail.gmail.com
This commit is contained in:
Thomas Munro
2019-03-14 10:25:27 +13:00
parent 5655565c07
commit c6c9474aaf
4 changed files with 34 additions and 5 deletions
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2
src/include/pgstat.h
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@ -817,6 +817,8 @@ typedef enum
WAIT_EVENT_BGWORKER_STARTUP,
WAIT_EVENT_BTREE_PAGE,
WAIT_EVENT_CLOG_GROUP_UPDATE,
WAIT_EVENT_CHECKPOINT_DONE,
WAIT_EVENT_CHECKPOINT_START,
WAIT_EVENT_EXECUTE_GATHER,
WAIT_EVENT_HASH_BATCH_ALLOCATING,
WAIT_EVENT_HASH_BATCH_ELECTING,