From 0d5407168827cb293abd9f0b5ecd406b16783f01 Mon Sep 17 00:00:00 2001
From: mh <mh@immerda.ch>
Date: Wed, 11 Aug 2010 09:59:09 +0200
Subject: introduce caching for xen plugins

calls to the xen binaries such as xm are quite heavy and we
therefore cache now a lot of the data that is generated for these
plugins and use them as well for the other ones.
---
 files/plugins/xen_vm | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

(limited to 'files/plugins/xen_vm')

diff --git a/files/plugins/xen_vm b/files/plugins/xen_vm
index a0dc0b7..a69b5fe 100644
--- a/files/plugins/xen_vm
+++ b/files/plugins/xen_vm
@@ -45,6 +45,11 @@
 
 XM="/usr/sbin/xm"
 
+# we cache xm list for 5 min for perfomance reasons
+((find /var/lib/munin/plugin-state/xm_list.state -mmin -5 2>&1 | grep -qE '^\/var\/lib\/munin\/plugin-state\/xm_list\.state$') && \
+    [ `cat /var/lib/munin/plugin-state/xm_list.state | wc -l` -gt 1 ]) || \
+    /usr/sbin/xm list | grep -v "^Name .* Console$" > /var/lib/munin/plugin-state/xm_list.state
+
 if [ "$1" = "autoconf" ]; then
 	echo yes
 	exit 0
@@ -61,7 +66,7 @@ if [ "$1" = "config" ]; then
 	exit 0
 fi
 
-domains=`$XM list | wc -l`
+domains=`cat /var/lib/munin/plugin-state/xm_list.state | wc -l`
 
 echo -n "domains.value "
 echo $(($domains-2))
-- 
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