From 72424c52fbe4e5e368f707350cda4a77ec880f46 Mon Sep 17 00:00:00 2001
From: Kevin Fenzi <kevin@scrye.com>
Date: Aug 05 2020 23:28:08 +0000
Subject: postgresql / db-koji01: allow adjusting max_workers and friends


db-koji01 has been running with this since before the mass rebuild, and
it seems to make it have a higher load, but process faster and without
stalling when doing backups or when long/bad koji-gc queries for old
versions of texlive hit it.

Signed-off-by: Kevin Fenzi <kevin@scrye.com>

---

diff --git a/inventory/host_vars/db-koji01.iad2.fedoraproject.org b/inventory/host_vars/db-koji01.iad2.fedoraproject.org
index ff0960b..f1436e9 100644
--- a/inventory/host_vars/db-koji01.iad2.fedoraproject.org
+++ b/inventory/host_vars/db-koji01.iad2.fedoraproject.org
@@ -43,8 +43,12 @@ custom_rules: [
 nrpe_procs_warn: 600
 nrpe_procs_crit: 700
 
-# we backup the backup on db-koji01 until we can replace now
 db_backup_dir: ['/backups']
 shared_buffers: "32GB"
 effective_cache_size: "100GB"
 max_stack_depth: "6MB"
+
+max_worker_processes: 64
+max_parallel_workers_per_gather: 32
+max_parallel_maintenance_workers: 8
+max_parallel_workers: 64
diff --git a/roles/postgresql_server/templates/postgresql.conf-12 b/roles/postgresql_server/templates/postgresql.conf-12
index 8bfe6dc..2c20622 100644
--- a/roles/postgresql_server/templates/postgresql.conf-12
+++ b/roles/postgresql_server/templates/postgresql.conf-12
@@ -207,6 +207,18 @@ dynamic_shared_memory_type = posix	# the default is the first option
 #parallel_leader_participation = on
 #max_parallel_workers = 8		# maximum number of max_worker_processes that
 					# can be used in parallel operations
+{% if max_worker_processes is defined %}
+max_worker_processes = {{ max_worker_processes }}
+{% endif %}
+{% if max_parallel_workers_per_gather is defined %}
+max_parallel_workers_per_gather = {{ max_parallel_workers_per_gather }}
+{% endif %}
+{% if max_parallel_maintenance_workers is defined %}
+max_parallel_maintenance_workers = {{ max_parallel_maintenance_workers }}
+{% endif %}
+{% if max_parallel_workers is defined %}
+max_parallel_workers = {{ max_parallel_workers }}
+{% endif %}
 #old_snapshot_threshold = -1		# 1min-60d; -1 disables; 0 is immediate
 					# (change requires restart)
 #backend_flush_after = 0		# measured in pages, 0 disables