From ccc84a956b00bdd4c162ca8951dd1ff7890cb51f Mon Sep 17 00:00:00 2001 From: Amit Kapila Date: Fri, 3 Aug 2018 09:11:37 +0530 Subject: [PATCH] Match the buffer usage tracking for leader and worker backends. In the leader backend, we don't track the buffer usage for ExecutorStart phase whereas in worker backend we track it for ExecutorStart phase as well. This leads to different value for buffer usage stats for the parallel and non-parallel query. Change the code so that worker backend also starts tracking buffer usage after ExecutorStart. Author: Amit Kapila and Robert Haas Reviewed-by: Robert Haas and Andres Freund Backpatch-through: 9.6 where this code was introduced Discussion: https://postgr.es/m/86137f17-1dfb-42f9-7421-82fd786b04a1@anayrat.info --- src/backend/executor/execParallel.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/src/backend/executor/execParallel.c b/src/backend/executor/execParallel.c index 52f1a96db5..ee0f07a81e 100644 --- a/src/backend/executor/execParallel.c +++ b/src/backend/executor/execParallel.c @@ -1281,9 +1281,6 @@ ParallelQueryMain(dsm_segment *seg, shm_toc *toc) /* Report workers' query for monitoring purposes */ pgstat_report_activity(STATE_RUNNING, debug_query_string); - /* Prepare to track buffer usage during query execution. */ - InstrStartParallelQuery(); - /* Attach to the dynamic shared memory area. */ area_space = shm_toc_lookup(toc, PARALLEL_KEY_DSA, false); area = dsa_attach_in_place(area_space, seg); @@ -1309,6 +1306,15 @@ ParallelQueryMain(dsm_segment *seg, shm_toc *toc) /* Pass down any tuple bound */ ExecSetTupleBound(fpes->tuples_needed, queryDesc->planstate); + /* + * Prepare to track buffer usage during query execution. + * + * We do this after starting up the executor to match what happens in the + * leader, which also doesn't count buffer accesses that occur during + * executor startup. + */ + InstrStartParallelQuery(); + /* * Run the plan. If we specified a tuple bound, be careful not to demand * more tuples than that.