Avoid acquiring spinlock when checking if recovery has finished, for speed.
RecoveryIsInProgress() can be called very frequently. During normal operation, it just checks a backend-local variable and returns quickly, but during hot standby, it checks a spinlock-protected shared variable. Those spinlock acquisitions can become a point of contention on a busy hot standby system. Replace the spinlock acquisition with a memory barrier. Per discussion with Andres Freund, Ants Aasma and Merlin Moncure. Branch ------ master Details ------- http://git.postgresql.org/pg/commitdiff/1a3d104475ce01326fc00601ed66ac4d658e37e5 Modified Files -------------- src/backend/access/transam/xlog.c | 21 +++++++++++++++++---- 1 file changed, 17 insertions(+), 4 deletions(-) -- Sent via pgsql-committers mailing list ([email protected]) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-committers
