alnzng commented on code in PR #1636: URL: https://github.com/apache/samza/pull/1636#discussion_r1015949373
########## 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: Oh, I see the gap here: Your point is that host CPU num != JVM available CPU num, and I thought they were the same. I think your point is correct. I did some research/test on the `OperatingSystemMXBean. getAvailableProcessors()`, the count is for logical CPU count instead of phsical CPU count. For non-containerization or VM use cases, the available logic/phsical CPU count in JVM should be same as in host, IIUC. I will update this oshi implementation based on logical CPU count anyway since we should be consistent with JVM. Note: I didn't verify if oshi shows the consistent behavior/result regarding the CPU count in the containerizaiton or VM land(e.g. docker, kubernetes). -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: commits-unsubscr...@samza.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
