1 /* Copyright (c) 2013-2016. 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"
7 #include "src/surf/FileImpl.hpp"
10 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_host, surf, "Logging specific to the SURF host module");
12 simgrid::surf::HostModel *surf_host_model = nullptr;
25 /* Each VM has a dummy CPU action on the PM layer. This CPU action works as the
26 * constraint (capacity) of the VM in the PM layer. If the VM does not have any
27 * active task, the dummy CPU action must be deactivated, so that the VM does
28 * not get any CPU share in the PM layer. */
29 void HostModel::ignoreEmptyVmInPmLMM()
31 /* iterate for all virtual machines */
32 for (s4u::VirtualMachine* const& ws_vm : vm::VirtualMachineImpl::allVms_) {
33 Cpu* cpu = ws_vm->pimpl_cpu;
34 int active_tasks = lmm_constraint_get_variable_amount(cpu->constraint());
36 /* The impact of the VM over its PM is the min between its vCPU amount and the amount of tasks it contains */
37 int impact = std::min(active_tasks, ws_vm->pimpl_vm_->coreAmount());
39 XBT_DEBUG("set the weight of the dummy CPU action of VM%p on PM to %d (#tasks: %d)", ws_vm, impact, active_tasks);
41 ws_vm->pimpl_vm_->action_->setSharingWeight(1. / impact);
43 ws_vm->pimpl_vm_->action_->setSharingWeight(0.);
47 /* Helper function for executeParallelTask */
48 static inline double has_cost(double* array, int pos)
56 Action* HostModel::executeParallelTask(int host_nb, simgrid::s4u::Host** host_list, double* flops_amount,
57 double* bytes_amount, double rate)
59 Action* action = nullptr;
60 if ((host_nb == 1) && (has_cost(bytes_amount, 0) <= 0)) {
61 action = host_list[0]->pimpl_cpu->execution_start(flops_amount[0]);
62 } else if ((host_nb == 1) && (has_cost(flops_amount, 0) <= 0)) {
63 action = surf_network_model->communicate(host_list[0], host_list[0], bytes_amount[0], rate);
64 } else if ((host_nb == 2) && (has_cost(flops_amount, 0) <= 0) && (has_cost(flops_amount, 1) <= 0)) {
68 for (int i = 0; i < host_nb * host_nb; i++) {
69 if (has_cost(bytes_amount, i) > 0.0) {
71 value = has_cost(bytes_amount, i);
75 action = surf_network_model->communicate(host_list[0], host_list[1], value, rate);
77 xbt_die("Cannot have a communication with no flop to exchange in this model. You should consider using the "
80 xbt_die("Cannot have a communication that is not a simple point-to-point in this model. You should consider "
81 "using the ptask model");
85 "This model only accepts one of the following. You should consider using the ptask model for the other cases.\n"
86 " - execution with one host only and no communication\n"
87 " - Self-comms with one host only\n"
88 " - Communications with two hosts and no computation");
96 HostImpl::HostImpl(s4u::Host* host) : piface_(host)
98 /* The VM wants to reinstall a new HostImpl, but we don't want to leak the previously existing one */
99 delete piface_->pimpl_;
100 piface_->pimpl_ = this;
103 void HostImpl::getAttachedStorageList(std::vector<const char*>* storages)
105 for (auto const& s : storage_)
106 if (s.second->getHost() == piface_->getCname())
107 storages->push_back(s.second->piface_.getName());