1 /* JNI interface to virtual machine in Simgrid */
3 /* Copyright (c) 2006-2014. The SimGrid Team. All rights reserved. */
5 /* This program is free software; you can redistribute it and/or modify it
6 * under the terms of the license (GNU LGPL) which comes with this package. */
8 package org.simgrid.msg;
9 import java.util.ArrayList;
11 public class VM extends Host {
12 // No need to declare a new bind variable: we use the one inherited from the super class Host
14 private static ArrayList<VM> vms= new ArrayList<>();
15 private Host currentHost;
17 /** Create a `basic' VM (i.e. 1GB of RAM, other values are not taken into account). */
18 public VM(Host host, String name) {
19 this(host,name,1024, 0, 0);
24 * @param host Host node
25 * @param name name of the machine
26 * @param ramSize size of the RAM that should be allocated (in MBytes)
27 * @param migNetSpeed (network bandwith allocated for migrations in MB/s, if you don't know put zero ;))
28 * @param dpIntensity (dirty page percentage according to migNetSpeed, [0-100], if you don't know put zero ;))
30 public VM(Host host, String name, int ramSize, int migNetSpeed, int dpIntensity){
33 this.currentHost = host;
34 create(host, name, ramSize, migNetSpeed, dpIntensity);
38 public native static VM[] all();
40 public static VM getVMByName(String name){
42 if (vm.getName().equals(name))
48 /** Shutdown and unref the VM.
50 * Actually, this strictly equivalent to shutdown().
51 * In C and in libvirt, the destroy function also releases the memory associated to the VM,
52 * but this is not the way it goes in Java. The VM will only get destroyed by the garbage
53 * collector when it is not referenced anymore by your variables. So, to see the VM really
54 * destroyed, don't call this function but simply release any ref you have on it.
56 public void destroy() {
61 /* Make sure that the GC also destroys the C object */
62 protected void finalize() throws Throwable {
65 public native void nativeFinalize();
67 /** Returns whether the given VM is currently suspended */
68 public native int isCreated();
70 /** Returns whether the given VM is currently running */
71 public native int isRunning();
73 /** Returns whether the given VM is currently running */
74 public native int isMigrating();
76 /** Returns whether the given VM is currently suspended */
77 public native int isSuspended();
80 * Natively implemented method create the VM.
81 * @param ramSize size of the RAM that should be allocated (in MB)
82 * @param migNetSpeed (network bandwith allocated for migrations in MB/s, if you don't know put zero ;))
83 * @param dpIntensity (dirty page intensity, a percentage of migNetSpeed [0-100], if you don't know put zero ;))
85 private native void create(Host host, String name, int ramSize, int migNetSpeed, int dpIntensity);
89 * Set a CPU bound for a given VM.
90 * @param bound in flops/s
92 public native void setBound(double bound);
95 public native void start();
99 * Immediately kills all processes within the given VM.
101 * No extra delay occurs. If you want to simulate this too, you want to use a MSG_process_sleep()
103 public native void shutdown();
105 /** Change the host on which all processes are running
106 * (pre-copy is implemented)
108 public void migrate(Host destination) throws HostFailureException{
110 this.nativeMigration(destination);
111 } catch (Exception e){
112 Msg.info("Migration of VM "+this.getName()+" to "+destination.getName()+" is impossible ("+e.getMessage()+")");
113 throw new HostFailureException();
115 // If the migration correcly returned, then we should change the currentHost value.
116 this.currentHost = destination;
118 private native void nativeMigration(Host destination) throws Exception;
120 /** Immediately suspend the execution of all processes within the given VM
122 * No suspension cost occurs. If you want to simulate this too, you want to
123 * use a \ref File.write() before or after, depending on the exact semantic
124 * of VM suspend to you.
126 public native void suspend();
128 /** Immediately resumes the execution of all processes within the given VM
130 * No resume cost occurs. If you want to simulate this too, you want to
131 * use a \ref File.read() before or after, depending on the exact semantic
132 * of VM resume to you.
134 public native void resume();
136 /** Class initializer (for JNI), don't do it yourself */
137 public static native void nativeInit();