uima-ducc-agent/src/main/java/org/apache/uima/ducc/agent/launcher/CGroupsTest.java

/*
 * 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.uima.ducc.agent.launcher;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

import org.apache.uima.ducc.agent.NodeAgent;
import org.apache.uima.ducc.common.utils.DuccLogger;
import org.apache.uima.ducc.common.utils.id.DuccIdFactory;

public class CGroupsTest {
  public static DuccLogger logger = DuccLogger.getLogger(NodeAgent.class, "CGroupsTest");

  CGroupsManager cgroupsManager = null;

  DuccIdFactory idFactory = null;

  Lock lock = new ReentrantLock();

  public static void main(String[] args) {
    try {
      CGroupsTest tester = new CGroupsTest();
      tester.initialize();
      if (args.length > 1) {
        // run concurrent threads
        tester.run(Long.parseLong(args[0]), true);
      } else {
        // run sequentially
        tester.run(Long.parseLong(args[0]), false);
      }
    } catch (Exception e) {
      e.printStackTrace();
    }
  }

  public void run(long howMany, boolean concurrent) {
    try {
      CGroupsTest tester = new CGroupsTest();
      tester.initialize();
      ExecutorService executor = Executors.newCachedThreadPool();
      // more than 1 arg to this program = concurrent
      if (concurrent) {
        for (int i = 0; i < howMany; i++) {
          WorkerThread t = new WorkerThread();
          executor.execute(t);
          // if the wait below is removed, cgroup creation fails
          synchronized (t) {
            // NOTE: waiting for 100ms seems to make cgcreate working.
            // Tested 10ms and got a failure to create cgroup. Weird.
            t.wait(100);
          }
        }
      } else {
        for (int i = 0; i < howMany; i++) {
          WorkerThread t = new WorkerThread();
          Future<?> f = executor.submit(t);
          f.get();

        }
      }
      executor.shutdownNow();
    } catch (Exception e) {
      e.printStackTrace();
    }

  }

  public void initialize() throws Exception {

    idFactory = new DuccIdFactory();
    String cgroupsUtilsDirs = System.getProperty("ducc.agent.launcher.cgroups.utils.dir");
    String cgUtilsPath = null;
    if (cgroupsUtilsDirs == null) {
      cgUtilsPath = "/bin"; // default
    }
    // get the top level cgroup folder from ducc.properties. If
    // not defined, use /cgroup/ducc as default
    String cgroupsBaseDir = System.getProperty("ducc.agent.launcher.cgroups.basedir");
    if (cgroupsBaseDir == null) {
      cgroupsBaseDir = "/cgroup/ducc";
    }
    String cgroupsSubsystems = "memory,cpu";
    long maxTimeToWaitForProcessToStop = 60000; // default 1 minute

    cgroupsManager = new CGroupsManager(cgUtilsPath, cgroupsBaseDir, cgroupsSubsystems, logger,
            maxTimeToWaitForProcessToStop);

  }

  public class WorkerThread implements Runnable {
    public WorkerThread() {

    }

    public void run() {
      try {
        String containerId;
        lock.lock();
        containerId = idFactory.next().toString() + "." + idFactory.next().toString();

        System.out.println(">>>> Thread::" + Thread.currentThread().getId()
                + " creating cgroup with id:" + containerId);
        if (!cgroupsManager.createContainer(containerId, System.getProperty("user.name"),
                cgroupsManager.getUserGroupName(System.getProperty("user.name")), true)) {
          System.out.println("Thread::" + Thread.currentThread().getId()
                  + " Failure to create cgroup with id:" + containerId);
          System.exit(-1);

        } else {
          if (cgroupsManager
                  .cgroupExists(cgroupsManager.getDuccCGroupBaseDir() + "/" + containerId)) {
            System.out.println("Thread::" + Thread.currentThread().getId()
                    + " Success creating cgroup with id:" + containerId);

            cgroupsManager.setContainerSwappiness(containerId, cgroupsManager.getDuccUid(), true,
                    10);
          } else {
            System.out.println("Failed to validate existance of cgroup with id:" + containerId);
            System.exit(-1);
          }
        }
        cgroupsManager.destroyContainer(containerId, cgroupsManager.getDuccUid(),
                NodeAgent.SIGTERM);
        System.out.println("Cgroup " + containerId + " Removed");
      } catch (Exception e) {
        e.printStackTrace();
        // System.exit(-1);
      } finally {
        lock.unlock();
      }
    }
  }
}