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 explicit ChordMessage(e_message_type_t type) : type(type)
69 issuer_host_name = simgrid::s4u::this_actor::host()->name();
72 ~ChordMessage() = default;
77 double start_time_ = -1;
78 double deadline_ = -1;
81 int pred_id_ = -1; // predecessor id
82 simgrid::s4u::MailboxPtr mailbox_; // my mailbox
83 int* fingers_; // finger table,(fingers[0] is my successor)
84 int next_finger_to_fix; // index of the next finger to fix in fix_fingers()
88 explicit Node(std::vector<std::string> args);
90 void join(int known_id);
95 void setFinger(int finger_index, int id);
97 void printFingerTable();
99 void setPredecessor(int predecessor_id);
100 void checkPredecessor();
101 int remoteGetPredecessor(int ask_to);
102 int closestPrecedingFinger(int id);
103 int findSuccessor(int id);
104 int remoteFindSuccessor(int ask_to, int id);
106 void notify(int predecessor_candidate_id);
107 void remoteNotify(int notify_id, int predecessor_candidate_id);
109 void handleMessage(ChordMessage* message);
113 simgrid::s4u::this_actor::sleep_for(start_time_);
114 if (known_id_ == -1) {
115 setPredecessor(-1); // -1 means that I have no predecessor
124 ChordMessage* message = nullptr;
125 void* data = nullptr;
126 double now = simgrid::s4u::Engine::instance()->getClock();
127 double next_stabilize_date = start_time_ + PERIODIC_STABILIZE_DELAY;
128 double next_fix_fingers_date = start_time_ + PERIODIC_FIX_FINGERS_DELAY;
129 double next_check_predecessor_date = start_time_ + PERIODIC_CHECK_PREDECESSOR_DELAY;
130 double next_lookup_date = start_time_ + PERIODIC_LOOKUP_DELAY;
132 while ((now < (start_time_ + deadline_)) && now < MAX_SIMULATION_TIME) {
134 simgrid::s4u::Comm& comm_receive = simgrid::s4u::this_actor::irecv(mailbox_, &data);
135 while ((now < (start_time_ + deadline_)) && now < MAX_SIMULATION_TIME && !comm_receive.test()) {
136 // no task was received: make some periodic calls
137 if (now >= next_stabilize_date) {
139 next_stabilize_date = simgrid::s4u::Engine::getClock() + PERIODIC_STABILIZE_DELAY;
140 } else if (now >= next_fix_fingers_date) {
142 next_fix_fingers_date = simgrid::s4u::Engine::getClock() + PERIODIC_FIX_FINGERS_DELAY;
143 } else if (now >= next_check_predecessor_date) {
145 next_check_predecessor_date = simgrid::s4u::Engine::getClock() + PERIODIC_CHECK_PREDECESSOR_DELAY;
146 } else if (now >= next_lookup_date) {
148 next_lookup_date = simgrid::s4u::Engine::getClock() + PERIODIC_LOOKUP_DELAY;
150 // nothing to do: sleep for a while
151 simgrid::s4u::this_actor::sleep_for(SLEEP_DELAY);
153 now = simgrid::s4u::Engine::getClock();
156 if (data != nullptr) {
157 message = static_cast<ChordMessage*>(data);
158 handleMessage(message);
160 now = simgrid::s4u::Engine::getClock();
162 if (data != nullptr) {
163 delete static_cast<ChordMessage*>(data);