1 /* Copyright (c) 2016. The SimGrid Team.
2 * All rights reserved. */
4 /* This program is free software; you can redistribute it and/or modify it
5 * under the terms of the license (GNU LGPL) which comes with this package. */
9 #include "simgrid/s4u.hpp"
11 #include <xbt/RngStream.h>
15 #define MAX_SIMULATION_TIME 1000
16 #define PERIODIC_STABILIZE_DELAY 20
17 #define PERIODIC_FIX_FINGERS_DELAY 120
18 #define PERIODIC_CHECK_PREDECESSOR_DELAY 120
19 #define PERIODIC_LOOKUP_DELAY 10
20 #define SLEEP_DELAY 4.9999
29 simgrid::s4u::Host* host = nullptr;
32 static simgrid::xbt::Extension<simgrid::s4u::Host, HostChord> EXTENSION_ID;
34 explicit HostChord(simgrid::s4u::Host* ptr) : host(ptr)
36 std::string descr = std::string("RngSream<") + host->cname() + ">";
37 stream_ = RngStream_CreateStream(descr.c_str());
40 ~HostChord() { RngStream_DeleteStream(&stream_); };
42 RngStream getStream() { return stream_; };
45 /* Types of tasks exchanged between nodes. */
48 FIND_SUCCESSOR_ANSWER,
50 GET_PREDECESSOR_ANSWER,
55 PREDECESSOR_ALIVE_ANSWER
60 e_message_type_t type; // type of message
61 std::string issuer_host_name; // used for logging
62 int request_id = -1; // id (used by some types of messages)
63 int request_finger = 1; // finger parameter (used by some types of messages)
64 int answer_id = -1; // answer (used by some types of messages)
65 simgrid::s4u::MailboxPtr answer_to; // mailbox to send an answer to (if any)
67 ChordMessage(e_message_type_t type) : type(type) { issuer_host_name = simgrid::s4u::this_actor::host()->name(); }
69 ~ChordMessage() = default;
74 double start_time_ = -1;
75 double deadline_ = -1;
78 int pred_id_ = -1; // predecessor id
79 simgrid::s4u::MailboxPtr mailbox_; // my mailbox
80 int* fingers_; // finger table,(fingers[0] is my successor)
81 int next_finger_to_fix; // index of the next finger to fix in fix_fingers()
85 explicit Node(std::vector<std::string> args);
87 void join(int known_id);
92 void setFinger(int finger_index, int id);
94 void printFingerTable();
96 void setPredecessor(int predecessor_id);
97 void checkPredecessor();
98 int remoteGetPredecessor(int ask_to);
99 int closestPrecedingFinger(int id);
100 int findSuccessor(int id);
101 int remoteFindSuccessor(int ask_to, int id);
103 void notify(int predecessor_candidate_id);
104 void remoteNotify(int notify_id, int predecessor_candidate_id);
106 void handleMessage(ChordMessage* message);
110 simgrid::s4u::this_actor::sleep_for(start_time_);
111 if (known_id_ == -1) {
112 setPredecessor(-1); // -1 means that I have no predecessor
121 ChordMessage* message = nullptr;
122 void* data = nullptr;
123 double now = simgrid::s4u::Engine::instance()->getClock();
124 double next_stabilize_date = start_time_ + PERIODIC_STABILIZE_DELAY;
125 double next_fix_fingers_date = start_time_ + PERIODIC_FIX_FINGERS_DELAY;
126 double next_check_predecessor_date = start_time_ + PERIODIC_CHECK_PREDECESSOR_DELAY;
127 double next_lookup_date = start_time_ + PERIODIC_LOOKUP_DELAY;
129 while ((now < (start_time_ + deadline_)) && now < MAX_SIMULATION_TIME) {
131 simgrid::s4u::Comm& comm_receive = simgrid::s4u::this_actor::irecv(mailbox_, &data);
132 while ((now < (start_time_ + deadline_)) && now < MAX_SIMULATION_TIME && !comm_receive.test()) {
133 // no task was received: make some periodic calls
134 if (now >= next_stabilize_date) {
136 next_stabilize_date = simgrid::s4u::Engine::instance()->getClock() + PERIODIC_STABILIZE_DELAY;
137 } else if (now >= next_fix_fingers_date) {
139 next_fix_fingers_date = simgrid::s4u::Engine::instance()->getClock() + PERIODIC_FIX_FINGERS_DELAY;
140 } else if (now >= next_check_predecessor_date) {
142 next_check_predecessor_date = simgrid::s4u::Engine::instance()->getClock() + PERIODIC_CHECK_PREDECESSOR_DELAY;
143 } else if (now >= next_lookup_date) {
145 next_lookup_date = simgrid::s4u::Engine::instance()->getClock() + PERIODIC_LOOKUP_DELAY;
147 // nothing to do: sleep for a while
148 simgrid::s4u::this_actor::sleep_for(SLEEP_DELAY);
150 now = simgrid::s4u::Engine::instance()->getClock();
153 if (data != nullptr) {
154 message = static_cast<ChordMessage*>(data);
155 handleMessage(message);
157 now = simgrid::s4u::Engine::instance()->getClock();