lakshmi-manasa-g commented on code in PR #1636: URL: https://github.com/apache/samza/pull/1636#discussion_r1015754291
########## samza-core/src/main/java/org/apache/samza/container/host/OshiBasedStatisticsGetter.java: ########## @@ -0,0 +1,90 @@ +/* + * 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.samza.container.host; + +import com.google.common.annotations.VisibleForTesting; +import java.util.ArrayList; +import java.util.HashMap; +import java.util.List; +import java.util.Map; +import org.apache.commons.lang3.NotImplementedException; +import oshi.SystemInfo; +import oshi.software.os.OSProcess; +import oshi.software.os.OperatingSystem; + + +/** + * An implementation of {@link SystemStatisticsGetter} that relies on using oshi framework(https://www.oshi.ooo/) + */ +public class OshiBasedStatisticsGetter implements SystemStatisticsGetter { + // the snapshots of current JVM process and its child processes + private final Map<Integer, OSProcess> previousProcessSnapshots = new HashMap<>(); + + private final OperatingSystem os; + private final int cpuCount; + + public OshiBasedStatisticsGetter() { + this(new SystemInfo()); + } + + @VisibleForTesting + OshiBasedStatisticsGetter(SystemInfo si) { + this(si.getOperatingSystem(), si.getHardware().getProcessor().getPhysicalProcessorCount()); + } + + @VisibleForTesting + OshiBasedStatisticsGetter(OperatingSystem os, int cpuCount) { + this.os = os; + this.cpuCount = cpuCount; + } + + @Override + public SystemMemoryStatistics getSystemMemoryStatistics() { + throw new NotImplementedException("Not implemented"); + } + + @Override + public ProcessCPUStatistics getProcessCPUStatistics() { + final List<OSProcess> currentProcessAndChildProcesses = getCurrentProcessAndChildProcesses(); + final double totalCPUUsage = getTotalCPUUsage(currentProcessAndChildProcesses); + refreshProcessSnapshots(currentProcessAndChildProcesses); + return new ProcessCPUStatistics(100d * totalCPUUsage / cpuCount); Review Comment: no, i am saying that the current samza process-cpu usage does NOT take into account the num cpu cores on the host. OperatingSystemMXBean is actually giving out the fraction of the total available cpu that the jvm process is using. hence it is between [0,1] AND NOT the actual cpu tick count which would need to take into account cpu core count but the proposed change in the pr takes into account num cores and gives the actual cpu tick count ########## samza-core/src/main/java/org/apache/samza/container/host/OshiBasedStatisticsGetter.java: ########## @@ -0,0 +1,90 @@ +/* + * 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.samza.container.host; + +import com.google.common.annotations.VisibleForTesting; +import java.util.ArrayList; +import java.util.HashMap; +import java.util.List; +import java.util.Map; +import org.apache.commons.lang3.NotImplementedException; +import oshi.SystemInfo; +import oshi.software.os.OSProcess; +import oshi.software.os.OperatingSystem; + + +/** + * An implementation of {@link SystemStatisticsGetter} that relies on using oshi framework(https://www.oshi.ooo/) + */ +public class OshiBasedStatisticsGetter implements SystemStatisticsGetter { + // the snapshots of current JVM process and its child processes + private final Map<Integer, OSProcess> previousProcessSnapshots = new HashMap<>(); + + private final OperatingSystem os; + private final int cpuCount; + + public OshiBasedStatisticsGetter() { + this(new SystemInfo()); + } + + @VisibleForTesting + OshiBasedStatisticsGetter(SystemInfo si) { + this(si.getOperatingSystem(), si.getHardware().getProcessor().getPhysicalProcessorCount()); + } + + @VisibleForTesting + OshiBasedStatisticsGetter(OperatingSystem os, int cpuCount) { + this.os = os; + this.cpuCount = cpuCount; + } + + @Override + public SystemMemoryStatistics getSystemMemoryStatistics() { + throw new NotImplementedException("Not implemented"); + } + + @Override + public ProcessCPUStatistics getProcessCPUStatistics() { + final List<OSProcess> currentProcessAndChildProcesses = getCurrentProcessAndChildProcesses(); Review Comment: i wouldnt think throwing another exception is needed. we can just return null form this stat getter right -- This is an automated message from the Apache Git Service. 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