Keep heavily-contended fields in XLogCtlInsert on different cache lines.
Performance testing shows that if the insertpos_lck spinlock and the fields
that it protects are on the same cache line with other variables that are
frequently accessed, the false sharing can hurt performance a lot. Keep
them apart by adding some padding.
Branch
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master
Details
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http://git.postgresql.org/pg/commitdiff/375d8526f2900d0c377f44532f6d09ee06531f67
Modified Files
--------------
src/backend/access/transam/xlog.c | 15 ++++++++++++---
src/include/pg_config_manual.h | 11 +++++++++++
2 files changed, 23 insertions(+), 3 deletions(-)