src/surf/disk_s19.cpp

   1 /* Copyright (c) 2013-2021. The SimGrid Team. All rights reserved.          */
   2
   3 /* This program is free software; you can redistribute it and/or modify it
   4  * under the terms of the license (GNU LGPL) which comes with this package. */
   5
   6 #include "disk_s19.hpp"
   7 #include "simgrid/kernel/routing/NetPoint.hpp"
   8 #include "simgrid/kernel/routing/NetZoneImpl.hpp"
   9 #include "simgrid/s4u/Engine.hpp"
  10 #include "simgrid/s4u/Host.hpp"
  11 #include "src/kernel/EngineImpl.hpp"
  12 #include "src/kernel/lmm/maxmin.hpp"
  13 #include "src/kernel/resource/profile/Event.hpp"
  14 #include "src/surf/xml/platf.hpp"
  15 #include "surf/surf.hpp"
  16
  17 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(res_disk);
  18
  19 /*********
  20  * Model *
  21  *********/
  22
  23 void surf_disk_model_init_default()
  24 {
  25   auto disk_model = std::make_shared<simgrid::kernel::resource::DiskS19Model>("Disk");
  26   simgrid::kernel::EngineImpl::get_instance()->add_model(disk_model);
  27   simgrid::s4u::Engine::get_instance()->get_netzone_root()->get_impl()->set_disk_model(disk_model);
  28 }
  29
  30 namespace simgrid {
  31 namespace kernel {
  32 namespace resource {
  33
  34 DiskImpl* DiskS19Model::create_disk(const std::string& name, double read_bandwidth, double write_bandwidth)
  35 {
  36   return (new DiskS19(name, read_bandwidth, write_bandwidth))->set_model(this);
  37 }
  38
  39 void DiskS19Model::update_actions_state(double /*now*/, double delta)
  40 {
  41   for (auto it = std::begin(*get_started_action_set()); it != std::end(*get_started_action_set());) {
  42     auto& action = *it;
  43     ++it; // increment iterator here since the following calls to action.finish() may invalidate it
  44     action.update_remains(rint(action.get_variable()->get_value() * delta));
  45     action.update_max_duration(delta);
  46
  47     if (((action.get_remains_no_update() <= 0) && (action.get_variable()->get_penalty() > 0)) ||
  48         ((action.get_max_duration() != NO_MAX_DURATION) && (action.get_max_duration() <= 0))) {
  49       action.finish(Action::State::FINISHED);
  50     }
  51   }
  52 }
  53
  54 DiskAction* DiskS19Model::io_start(const DiskImpl* disk, sg_size_t size, s4u::Io::OpType type)
  55 {
  56   auto* action = new DiskS19Action(this, static_cast<double>(size), not disk->is_on());
  57   get_maxmin_system()->expand(disk->get_constraint(), action->get_variable(), 1.0);
  58   switch (type) {
  59     case s4u::Io::OpType::READ:
  60       get_maxmin_system()->expand(disk->get_read_constraint(), action->get_variable(), 1.0);
  61       break;
  62     case s4u::Io::OpType::WRITE:
  63       get_maxmin_system()->expand(disk->get_write_constraint(), action->get_variable(), 1.0);
  64       break;
  65     default:
  66       THROW_UNIMPLEMENTED;
  67   }
  68   return action;
  69 }
  70
  71 /************
  72  * Resource *
  73  ************/
  74 void DiskS19::update_penalties(double delta)
  75 {
  76   const kernel::lmm::Element* elem     = nullptr;
  77   const kernel::lmm::Element* nextelem = nullptr;
  78   int numelem                          = 0;
  79   while (const auto* var = get_constraint()->get_variable_safe(&elem, &nextelem, &numelem)) {
  80     auto* action = static_cast<DiskS19Action*>(var->get_id());
  81     action->sharing_penalty_ += delta;
  82     if (not action->is_suspended())
  83       get_model()->get_maxmin_system()->update_variable_penalty(action->get_variable(), action->sharing_penalty_);
  84   }
  85 }
  86
  87 void DiskS19::set_read_bandwidth(double value)
  88 {
  89   read_bw_.peak = value;
  90
  91   get_model()->get_maxmin_system()->update_constraint_bound(get_constraint(),
  92                                                             sg_bandwidth_factor * (read_bw_.peak * read_bw_.scale));
  93
  94   double delta = 1.0 / value - 1.0 / (read_bw_.peak * read_bw_.scale);
  95   update_penalties(delta);
  96 }
  97
  98 void DiskS19::set_write_bandwidth(double value)
  99 {
 100   write_bw_.peak = value;
 101
 102   get_model()->get_maxmin_system()->update_constraint_bound(get_constraint(),
 103                                                             sg_bandwidth_factor * (write_bw_.peak * write_bw_.scale));
 104
 105   double delta = 1.0 / value - 1.0 / (write_bw_.peak * write_bw_.scale);
 106   update_penalties(delta);
 107 }
 108
 109 void DiskS19::apply_event(kernel::profile::Event* triggered, double value)
 110 {
 111   /* Find out which of my iterators was triggered, and react accordingly */
 112   if (triggered == read_bw_.event) {
 113     set_read_bandwidth(value);
 114     tmgr_trace_event_unref(&read_bw_.event);
 115
 116   } else if (triggered == write_bw_.event) {
 117     set_write_bandwidth(value);
 118     tmgr_trace_event_unref(&write_bw_.event);
 119
 120   } else if (triggered == state_event_) {
 121     if (value > 0)
 122       turn_on();
 123     else
 124       turn_off();
 125     tmgr_trace_event_unref(&state_event_);
 126   } else {
 127     xbt_die("Unknown event!\n");
 128   }
 129
 130   XBT_DEBUG("There was a resource state event, need to update actions related to the constraint (%p)",
 131             get_constraint());
 132 }
 133
 134 /**********
 135  * Action *
 136  **********/
 137
 138 DiskS19Action::DiskS19Action(Model* model, double cost, bool failed)
 139     : DiskAction(model, cost, failed, model->get_maxmin_system()->variable_new(this, 1.0, -1.0, 3))
 140 {
 141 }
 142
 143 void DiskS19Action::update_remains_lazy(double /*now*/)
 144 {
 145   THROW_IMPOSSIBLE;
 146 }
 147 } // namespace resource
 148 } // namespace kernel
 149 } // namespace simgrid