--- /dev/null
+/* Copyright (c) 2010, 2012-2016. The SimGrid Team. All rights reserved. */
+
+/* This program is free software; you can redistribute it and/or modify it
+ * under the terms of the license (GNU LGPL) which comes with this package. */
+
+#include "simgrid/plugins/dvfs.h"
+#include "simgrid/plugins/load.h"
+#include "simgrid/simix.hpp"
+#include "src/plugins/vm/VirtualMachineImpl.hpp"
+#include "src/surf/cpu_interface.hpp"
+
+#include <boost/algorithm/string/classification.hpp>
+#include <boost/algorithm/string/split.hpp>
+#include <simgrid/msg.h>
+#include <simgrid/s4u/Engine.hpp>
+#include <string>
+#include <utility>
+#include <vector>
+
+/** @addtogroup SURF_plugin_load
+
+ This plugin makes it very simple for users to obtain the current load for each host.
+
+*/
+
+XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_plugin_dvfs, surf, "Logging specific to the SURF HostDvfs plugin");
+
+namespace simgrid {
+namespace plugin {
+
+namespace dvfs {
+class Governor {
+
+protected:
+ simgrid::s4u::Host* host;
+
+public:
+ double sampling_rate;
+
+ Governor(simgrid::s4u::Host* ptr) : host(ptr) { init(); }
+
+ void init()
+ {
+ const char* local_sampling_rate_config = host->getProperty("plugin/dvfs/sampling_rate");
+ double global_sampling_rate_config = xbt_cfg_get_double("plugin/dvfs/sampling_rate");
+ if (local_sampling_rate_config != nullptr) {
+ sampling_rate = std::stod(local_sampling_rate_config);
+ } else {
+ sampling_rate = global_sampling_rate_config;
+ }
+ }
+
+ virtual void update() = 0;
+ double samplingRate() { return sampling_rate; }
+};
+
+class Performance : public Governor {
+public:
+ Performance(simgrid::s4u::Host* ptr) : Governor(ptr) {}
+
+ void update() { host->setPstate(0); }
+};
+
+class Powersave : public Governor {
+public:
+ Powersave(simgrid::s4u::Host* ptr) : Governor(ptr) {}
+
+ void update() { host->setPstate(host->getPstatesCount() - 1); }
+};
+
+class OnDemand : public Governor {
+ double freq_up_threshold = 0.95;
+
+public:
+ OnDemand(simgrid::s4u::Host* ptr) : Governor(ptr) {}
+
+ void update()
+ {
+ double load = sg_host_get_current_load(host);
+
+ if (load > freq_up_threshold) {
+ host->setPstate(0); /* Run at max. performance! */
+ XBT_INFO("Changed to pstate %f", 0.0);
+ } else {
+ /* The actual implementation uses a formula here: (See Kernel file cpufreq_ondemand.c:158)
+ *
+ * freq_next = min_f + load * (max_f - min_f) / 100;
+ *
+ * So they assume that frequency increases by 100 MHz. We will just use
+ * lowest_pstate - load*pstatesCount();
+ */
+ int max_pstate = host->getPstatesCount() - 1;
+
+ host->setPstate(max_pstate - load * max_pstate);
+ XBT_INFO("Changed to pstate %f -- check: %i", max_pstate - load * max_pstate, host->getPstate());
+ }
+ }
+};
+
+class Conservative : public Governor {
+ double freq_up_threshold = .8;
+ double freq_down_threshold = .2;
+
+public:
+ Conservative(simgrid::s4u::Host* ptr) : Governor(ptr) {}
+
+ void update()
+ {
+ double load = sg_host_get_current_load(host);
+ int pstate = host->getPstate();
+
+ if (load > freq_up_threshold) {
+ if (pstate != 0) {
+ host->setPstate(pstate - 1);
+ XBT_INFO("Reducing pstate to %d", pstate - 1);
+ }
+ }
+
+ if (load < freq_down_threshold) {
+ int max_pstate = host->getPstatesCount() - 1;
+ if (pstate != max_pstate) { // Are we in the slowest pstate already?
+ host->setPstate(pstate + 1);
+ XBT_INFO("Increasing pstate to %d", pstate + 1);
+ }
+ }
+ }
+};
+}
+
+class HostDvfs {
+public:
+ static simgrid::xbt::Extension<simgrid::s4u::Host, HostDvfs> EXTENSION_ID;
+
+ explicit HostDvfs(simgrid::s4u::Host* ptr);
+ ~HostDvfs();
+
+private:
+ simgrid::s4u::Host* host = nullptr;
+};
+
+simgrid::xbt::Extension<simgrid::s4u::Host, HostDvfs> HostDvfs::EXTENSION_ID;
+
+HostDvfs::HostDvfs(simgrid::s4u::Host* ptr) : host(ptr)
+{
+}
+
+HostDvfs::~HostDvfs() = default;
+}
+}
+
+using simgrid::plugin::HostDvfs;
+
+/* **************************** events callback *************************** */
+static int check(int argc, char* argv[]);
+
+static void on_host_added(simgrid::s4u::Host& host)
+{
+ if (dynamic_cast<simgrid::s4u::VirtualMachine*>(&host)) // Ignore virtual machines
+ return;
+
+ // host.extension_set(new HostDvfs(&host));
+ // This call must be placed in this function. Otherweise, the daemonize() call comes too late and
+ // SMPI will take this process as an MPI process!
+ MSG_process_daemonize(MSG_process_create("daemon", check, NULL, &host));
+}
+
+static int check(int argc, char* argv[])
+{
+ msg_host_t host = MSG_host_self();
+
+ int isDaemon = (MSG_process_self())->getImpl()->isDaemon();
+ XBT_INFO("Bin ein Daemon: %d", isDaemon);
+
+ simgrid::plugin::dvfs::Conservative governor(host);
+ while (1) {
+ // Sleep before updating; important for startup (i.e., t = 0).
+ // In the beginning, we want to go with the pstates specified in the platform file
+ // (so we sleep first)
+ MSG_process_sleep(governor.samplingRate());
+ governor.update();
+ XBT_INFO("Governor just updated!");
+ }
+
+ // const char* dvfs_governor = host->property("plugin/dvfs/governor");
+
+ XBT_INFO("I will never reach that point: daemons are killed when regular processes are done");
+ return 0;
+}
+
+/* **************************** Public interface *************************** */
+SG_BEGIN_DECL()
+
+/** \ingroup SURF_plugin_load
+ * \brief Initializes the HostDvfs plugin
+ * \details The HostDvfs plugin provides an API to get the current load of each host.
+ */
+void sg_host_dvfs_plugin_init()
+{
+ if (HostDvfs::EXTENSION_ID.valid())
+ return;
+
+ HostDvfs::EXTENSION_ID = simgrid::s4u::Host::extension_create<HostDvfs>();
+
+ sg_host_load_plugin_init();
+
+ simgrid::s4u::Host::onCreation.connect(&on_host_added);
+ xbt_cfg_register_double("plugin/dvfs/sampling_rate", 0.1, nullptr,
+ "How often should the dvfs plugin check whether the frequency needs to be changed?");
+}
+
+SG_END_DECL()
