From e20fc2961c6d4dca7387cd0b5a6dc61a8fef4664 Mon Sep 17 00:00:00 2001
From: Grant Slater <git@firefishy.com>
Date: Sun, 17 Nov 2019 15:16:39 +0000
Subject: [PATCH] Better CPU/IO scheduling for cron on tilecaches

---
 cookbooks/systemd/resources/service.rb          |  3 +++
 cookbooks/systemd/templates/default/service.erb |  9 +++++++++
 cookbooks/tilecache/recipes/default.rb          | 10 ++++++++++
 3 files changed, 22 insertions(+)

diff --git a/cookbooks/systemd/resources/service.rb b/cookbooks/systemd/resources/service.rb
index 282b36178..4758f7af5 100644
--- a/cookbooks/systemd/resources/service.rb
+++ b/cookbooks/systemd/resources/service.rb
@@ -62,6 +62,9 @@ property :no_new_privileges, [TrueClass, FalseClass]
 property :tasks_max, Integer
 property :timeout_sec, Integer
 property :pid_file, String
+property :nice, Integer
+property :io_scheduling_class, [Integer, String]
+property :io_scheduling_priority, Integer
 
 action :create do
   service_variables = new_resource.to_hash
diff --git a/cookbooks/systemd/templates/default/service.erb b/cookbooks/systemd/templates/default/service.erb
index 46b8aa575..188404508 100644
--- a/cookbooks/systemd/templates/default/service.erb
+++ b/cookbooks/systemd/templates/default/service.erb
@@ -114,6 +114,15 @@ TimeoutSec=<%= @timeout_sec %>
 <% if @pid_file -%>
 PIDFile=<%= @pid_file %>
 <% end -%>
+<% if @nice -%>
+Nice=<%= @nice %>
+<% end -%>
+<% if @io_scheduling_class -%>
+IOSchedulingClass=<%= @io_scheduling_class %>
+<% end -%>
+<% if @io_scheduling_priority -%>
+IOSchedulingPriority=<%= @io_scheduling_priority %>
+<% end -%>
 <% unless @dropin -%>
 
 [Install]
diff --git a/cookbooks/tilecache/recipes/default.rb b/cookbooks/tilecache/recipes/default.rb
index 1068b1b0d..63de8a529 100644
--- a/cookbooks/tilecache/recipes/default.rb
+++ b/cookbooks/tilecache/recipes/default.rb
@@ -109,6 +109,16 @@ template "/etc/logrotate.d/squid" do
   mode 0o644
 end
 
+# Configure cron with lower cpu and IO priority
+systemd_service "cron-load" do
+  service "cron"
+  dropin "load"
+  nice 19
+  io_scheduling_class "best-effort"
+  io_scheduling_priority 7
+  notifies :restart, "service[cron]"
+end
+
 nginx_site "default" do
   action [:delete]
 end
-- 
2.43.2