Github user tibkiss commented on a diff in the pull request:
https://github.com/apache/storm/pull/1934#discussion_r100821485
--- Diff: storm-core/src/jvm/org/apache/storm/metric/cgroup/CGroupCpu.java
---
@@ -0,0 +1,68 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.storm.metric.cgroup;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * Report CPU used in the cgroup
+ */
+public class CGroupCpu extends CGroupMetricsBase<Map<String,Long>> {
+ long previousSystem = 0;
+ long previousUser = 0;
+
+ public CGroupCpu(Map<String, Object> conf) {
+ super(conf, "cpuacct.stat");
+ }
+
+ public int getUserHZ() {
+ return 100; // On most systems (x86) this is fine.
+ // If someone really does want full support
+ // we need to run `getconf CLK_TCK` and cache the result.
+ }
+
+ @Override
+ public Map<String, Long> parseFileContents(String contents) {
+ try {
+ long systemHz = 0;
+ long userHz = 0;
+ for (String line: contents.split("\n")) {
+ if (!line.isEmpty()) {
+ String [] parts = line.toLowerCase().split("\\s+");
+ if (parts[0].contains("system")) {
+ systemHz = Long.parseLong(parts[1].trim());
+ } else if (parts[0].contains("user")) {
+ userHz = Long.parseLong(parts[1].trim());
+ }
+ }
+ }
+ long user = userHz - previousUser;
+ long sys = systemHz - previousSystem;
+ previousUser = userHz;
+ previousSystem = systemHz;
+ long hz = getUserHZ();
+ HashMap<String, Long> ret = new HashMap<>();
+ ret.put("user-ms", user * 1000/hz); //Convert to millis
--- End diff --
Makes sense, thanks for the explanation.
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