Thread: pgsql: Reduce memory consumption for pending invalidation messages.
Reduce memory consumption for pending invalidation messages. The existing data structures in inval.c are fairly inefficient for the common case of a command or subtransaction that registers a small number of cache invalidation events. While this doesn't matter if we commit right away, it can build up to a lot of bloat in a transaction that contains many DDL operations. By making a few more assumptions about the expected use-case, we can switch to a representation using densely-packed arrays. Although this eliminates some data-copying, it doesn't seem to make much difference time-wise. But the space consumption decreases substantially. Patch by me; thanks to Nathan Bossart for review. Discussion: https://postgr.es/m/2380555.1622395376@sss.pgh.pa.us Branch ------ master Details ------- https://git.postgresql.org/pg/commitdiff/3aafc030a53621e91be2e7c1c72b5f3e8b103486 Modified Files -------------- src/backend/utils/cache/inval.c | 514 ++++++++++++++++++++++------------------ 1 file changed, 286 insertions(+), 228 deletions(-)