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Eliminate "parallel degree" terminology.

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This terminology provoked widespread complaints.  So, instead, rename
the GUC max_parallel_degree to max_parallel_workers_per_gather
(leaving room for a possible future GUC max_parallel_workers that acts
as a system-wide limit), and rename the parallel_degree reloption to
parallel_workers.  Rename structure members to match.

These changes create a dump/restore hazard for users of PostgreSQL
9.6beta1 who have set the reloption (or applied the GUC using ALTER
USER or ALTER DATABASE).
This commit is contained in:
Robert Haas
2016-06-09 09:08:27 -04:00
parent 6581e930a8
commit c9ce4a1c61
19 changed files with 99 additions and 99 deletions
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8
src/backend/optimizer/path/costsize.c
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@@ -113,7 +113,7 @@ int effective_cache_size = DEFAULT_EFFECTIVE_CACHE_SIZE;
Cost disable_cost = 1.0e10;
int max_parallel_degree = 2;
int max_parallel_workers_per_gather = 2;
bool enable_seqscan = true;
bool enable_indexscan = true;
@@ -229,9 +229,9 @@ cost_seqscan(Path *path, PlannerInfo *root,
cpu_run_cost += path->pathtarget->cost.per_tuple * path->rows;
/* Adjust costing for parallelism, if used. */
if (path->parallel_degree > 0)
if (path->parallel_workers > 0)
{
double parallel_divisor = path->parallel_degree;
double parallel_divisor = path->parallel_workers;
double leader_contribution;
/*
@@ -245,7 +245,7 @@ cost_seqscan(Path *path, PlannerInfo *root,
* estimate that the leader spends 30% of its time servicing each
* worker, and the remainder executing the parallel plan.
*/
leader_contribution = 1.0 - (0.3 * path->parallel_degree);
leader_contribution = 1.0 - (0.3 * path->parallel_workers);
if (leader_contribution > 0)
parallel_divisor += leader_contribution;