From 7d8105ed5531efab1dddf37845e732d4c66ad01e Mon Sep 17 00:00:00 2001
From: Jesse Pretorius <jesse.pretorius@rackspace.co.uk>
Date: Wed, 25 Nov 2015 19:47:02 +0000
Subject: [PATCH] Implement tunable heat api and engine worker overrides

This patch introduces an override for the number of Heat engine and
Heat API workers:
 - heat_engine_workers
 - heat_api_workers

The values may be set in /etc/openstack_deploy/user_variables.yml
and if they are unset, half the number of available vCPU's will be
used instead.

Implements: blueprint gate-split
Change-Id: I1ecb4951fe8336d9ef86ef9d5c8c21105a299096
---
 playbooks/roles/os_heat/defaults/main.yml      | 4 ++++
 playbooks/roles/os_heat/templates/heat.conf.j2 | 6 ++++++
 2 files changed, 10 insertions(+)

diff --git a/playbooks/roles/os_heat/defaults/main.yml b/playbooks/roles/os_heat/defaults/main.yml
index 8fb16385b6..6c60098af1 100644
--- a/playbooks/roles/os_heat/defaults/main.yml
+++ b/playbooks/roles/os_heat/defaults/main.yml
@@ -146,6 +146,10 @@ heat_watch_port: 8003
 heat_watch_server_uri: "{{ heat_watch_proto }}://{{ external_lb_vip_address }}:{{ heat_watch_port }}"
 heat_watch_server_url: "{{ heat_watch_server_uri }}"
 
+# If the following variables are unset in user_variables, the value set will be half the number of available VCPUs
+# heat_engine_workers: 4
+# heat_api_workers: 4
+
 ## Plugin dirs
 heat_plugin_dirs:
   - /usr/lib/heat
diff --git a/playbooks/roles/os_heat/templates/heat.conf.j2 b/playbooks/roles/os_heat/templates/heat.conf.j2
index ffb1e68043..a6d9a2c393 100644
--- a/playbooks/roles/os_heat/templates/heat.conf.j2
+++ b/playbooks/roles/os_heat/templates/heat.conf.j2
@@ -1,5 +1,8 @@
 # {{ ansible_managed }}
 
+{% set _api_threads = ansible_processor_vcpus|default(2) // 2 %}
+{% set api_threads = _api_threads if _api_threads > 0 else 1 %}
+
 [DEFAULT]
 verbose = {{ verbose }}
 debug = {{ debug }}
@@ -20,6 +23,8 @@ trusts_delegated_roles = {{ heat_trusts_delegated_roles | join(',') }}
 
 auth_encryption_key = {{ heat_auth_encryption_key }}
 
+num_engine_workers = {{ heat_engine_workers | default(api_threads) }}
+
 ## RPC Backend
 rpc_backend = {{ heat_rpc_backend }}
 
@@ -51,6 +56,7 @@ auth_uri = {{ keystone_service_internalurl }}
 
 [heat_api]
 bind_port = {{ heat_service_port }}
+workers = {{ heat_api_workers | default(api_threads) }}
 
 [heat_api_cfn]
 bind_port = {{ heat_cfn_service_port }}