1 /* Copyright (c) 2013-2017. The SimGrid Team. All rights reserved. */
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. */
6 #include "src/plugins/vm/VirtualMachineImpl.hpp"
9 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_host, surf, "Logging specific to the SURF host module");
11 simgrid::surf::HostModel *surf_host_model = nullptr;
24 /* Each VM has a dummy CPU action on the PM layer. This CPU action works as the
25 * constraint (capacity) of the VM in the PM layer. If the VM does not have any
26 * active task, the dummy CPU action must be deactivated, so that the VM does
27 * not get any CPU share in the PM layer. */
28 void HostModel::ignoreEmptyVmInPmLMM()
30 /* iterate for all virtual machines */
31 for (s4u::VirtualMachine* const& ws_vm : vm::VirtualMachineImpl::allVms_) {
32 Cpu* cpu = ws_vm->pimpl_cpu;
33 int active_tasks = cpu->constraint()->get_variable_amount();
35 /* The impact of the VM over its PM is the min between its vCPU amount and the amount of tasks it contains */
36 int impact = std::min(active_tasks, ws_vm->pimpl_vm_->coreAmount());
38 XBT_DEBUG("set the weight of the dummy CPU action of VM%p on PM to %d (#tasks: %d)", ws_vm, impact, active_tasks);
40 ws_vm->pimpl_vm_->action_->setSharingWeight(1. / impact);
42 ws_vm->pimpl_vm_->action_->setSharingWeight(0.);
46 /* Helper function for executeParallelTask */
47 static inline double has_cost(double* array, int pos)
55 Action* HostModel::executeParallelTask(int host_nb, simgrid::s4u::Host** host_list, double* flops_amount,
56 double* bytes_amount, double rate)
58 Action* action = nullptr;
59 if ((host_nb == 1) && (has_cost(bytes_amount, 0) <= 0)) {
60 action = host_list[0]->pimpl_cpu->execution_start(flops_amount[0]);
61 } else if ((host_nb == 1) && (has_cost(flops_amount, 0) <= 0)) {
62 action = surf_network_model->communicate(host_list[0], host_list[0], bytes_amount[0], rate);
63 } else if ((host_nb == 2) && (has_cost(flops_amount, 0) <= 0) && (has_cost(flops_amount, 1) <= 0)) {
67 for (int i = 0; i < host_nb * host_nb; i++) {
68 if (has_cost(bytes_amount, i) > 0.0) {
70 value = has_cost(bytes_amount, i);
74 action = surf_network_model->communicate(host_list[0], host_list[1], value, rate);
76 xbt_die("Cannot have a communication with no flop to exchange in this model. You should consider using the "
79 xbt_die("Cannot have a communication that is not a simple point-to-point in this model. You should consider "
80 "using the ptask model");
84 "This model only accepts one of the following. You should consider using the ptask model for the other cases.\n"
85 " - execution with one host only and no communication\n"
86 " - Self-comms with one host only\n"
87 " - Communications with two hosts and no computation");
90 delete[] flops_amount;
91 delete[] bytes_amount;
98 HostImpl::HostImpl(s4u::Host* host) : piface_(host)
100 /* The VM wants to reinstall a new HostImpl, but we don't want to leak the previously existing one */
101 delete piface_->pimpl_;
102 piface_->pimpl_ = this;
105 void HostImpl::getAttachedStorageList(std::vector<const char*>* storages)
107 for (auto const& s : storage_)
108 if (s.second->getHost() == piface_->getCname())
109 storages->push_back(s.second->piface_.getCname());