From 85e9af42897a00784de72eba0f5568306208a08a Mon Sep 17 00:00:00 2001
From: Steffen Vogel <post@steffenvogel.de>
Date: Sun, 13 Sep 2020 08:14:41 +0200
Subject: [PATCH] make rate of periodic statistics configurable (closes #273)

---
 include/villas/super_node.hpp | 1 +
 lib/super_node.cpp            | 7 +++++--
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/include/villas/super_node.hpp b/include/villas/super_node.hpp
index 8e3ed7ffb..e64b855c1 100644
--- a/include/villas/super_node.hpp
+++ b/include/villas/super_node.hpp
@@ -73,6 +73,7 @@ protected:
 	int priority;		/**< Process priority (lower is better) */
 	int affinity;		/**< Process affinity of the server and all created threads */
 	int hugepages;		/**< Number of hugepages to reserve. */
+	double statsRate;	/**< Rate at which we display the periodic stats. */
 
 	struct Task task;	/**< Task for periodic stats output */
 
diff --git a/lib/super_node.cpp b/lib/super_node.cpp
index 4da961480..b86018f8b 100644
--- a/lib/super_node.cpp
+++ b/lib/super_node.cpp
@@ -62,6 +62,7 @@ SuperNode::SuperNode() :
 	priority(0),
 	affinity(0),
 	hugepages(DEFAULT_NR_HUGEPAGES),
+	statsRate(1.0),
 	task(CLOCK_REALTIME)
 {
 	int ret;
@@ -111,7 +112,8 @@ void SuperNode::parse(json_t *root)
 
 	json_error_t err;
 
-	ret = json_unpack_ex(root, &err, 0, "{ s?: o, s?: o, s?: o, s?: o, s?: i, s?: i, s?: i, s?: s, s?: b }",
+	ret = json_unpack_ex(root, &err, 0, "{ s?: F, s?: o, s?: o, s?: o, s?: o, s?: i, s?: i, s?: i, s?: s, s?: b }",
+		"stats", &statsRate,
 		"http", &json_http,
 		"logging", &json_logging,
 		"nodes", &json_nodes,
@@ -386,7 +388,8 @@ void SuperNode::start()
 	startNodes();
 	startPaths();
 
-	task.setRate(1.0);
+	if (statsRate > 0) // A rate <0 will disable the periodic stats
+		task.setRate(statsRate);
 
 	Stats::printHeader(Stats::Format::HUMAN);