{
s4u_Host* host = simgrid::s4u::Host::by_name("MyHost1");
- XBT_INFO("Initial peak speed: %.0E flop/s; number of flops computed so far: %.0E (should be 0)", host->getSpeed(),
- sg_host_get_computed_flops(host));
+ XBT_INFO("Initial peak speed: %.0E flop/s; number of flops computed so far: %.0E (should be 0) and current average load: %.5f (should be 0)", host->getSpeed(),
+ sg_host_get_computed_flops(host), sg_host_get_avg_load(host));
double start = simgrid::s4u::Engine::getClock();
XBT_INFO("Sleep for 10 seconds");
simgrid::s4u::this_actor::sleep_for(10);
+ double speed = host->getSpeed();
XBT_INFO("Done sleeping %.2fs; peak speed: %.0E flop/s; number of flops computed so far: %.0E (nothing should have "
"changed)",
simgrid::s4u::Engine::getClock() - start, host->getSpeed(), sg_host_get_computed_flops(host));
// Run a task
start = simgrid::s4u::Engine::getClock();
- XBT_INFO("Run a task of %.0E flops", 100E6);
- simgrid::s4u::this_actor::execute(100E6);
+ XBT_INFO("Run a task of %.0E flops at current speed of %.0E flop/s", 200E6, host->getSpeed());
+ simgrid::s4u::this_actor::execute(200E6);
- XBT_INFO("Done working on my task; this took %.2fs; current peak speed: %.0E flop/s; number of flops computed so "
- "far: %.0E",
- simgrid::s4u::Engine::getClock() - start, host->getSpeed(), sg_host_get_computed_flops(host));
+ XBT_INFO("Done working on my task; this took %.2fs; current peak speed: %.0E flop/s (when I started the computation, the speed was set to %.0E flop/s); number of flops computed so "
+ "far: %.2E, average load as reported by the HostLoad plugin: %.5f (should be %.5f)",
+ simgrid::s4u::Engine::getClock() - start, host->getSpeed(), speed, sg_host_get_computed_flops(host), sg_host_get_avg_load(host),
+ static_cast<double>(200E6)/(10.5*speed*host->getCoreCount()+(simgrid::s4u::Engine::getClock()-start-0.5)*host->getSpeed()*host->getCoreCount()));
// ========= Change power peak =========
- int pstate = 2;
+ int pstate = 1;
host->setPstate(pstate);
- XBT_INFO("========= Requesting pstate %d (speed should be of %.0E flop/s and is of %.0E flop/s)", pstate,
- host->getPstateSpeed(pstate), host->getSpeed());
+ XBT_INFO("========= Requesting pstate %d (speed should be of %.0E flop/s and is of %.0E flop/s, average load is %.5f)", pstate,
+ host->getPstateSpeed(pstate), host->getSpeed(), sg_host_get_avg_load(host));
// Run a second task
start = simgrid::s4u::Engine::getClock();
XBT_INFO("Run a task of %.0E flops", 100E6);
simgrid::s4u::this_actor::execute(100E6);
XBT_INFO("Done working on my task; this took %.2fs; current peak speed: %.0E flop/s; number of flops computed so "
- "far: %.0E",
+ "far: %.2E",
simgrid::s4u::Engine::getClock() - start, host->getSpeed(), sg_host_get_computed_flops(host));
start = simgrid::s4u::Engine::getClock();
- XBT_INFO("========= Requesting a reset of the computation counter");
+ XBT_INFO("========= Requesting a reset of the computation and load counters");
sg_host_load_reset(host);
+ XBT_INFO("After reset: %.0E flops computed; load is %.5f", sg_host_get_computed_flops(host), sg_host_get_avg_load(host));
XBT_INFO("Sleep for 4 seconds");
simgrid::s4u::this_actor::sleep_for(4);
XBT_INFO("Done sleeping %.2f s; peak speed: %.0E flop/s; number of flops computed so far: %.0E",
// =========== Turn the other host off ==========
s4u_Host* host2 = simgrid::s4u::Host::by_name("MyHost2");
- XBT_INFO("Turning MyHost2 off, and sleeping another 10 seconds. MyHost2 computed %.0f flops so far.",
- sg_host_get_computed_flops(host2));
+ XBT_INFO("Turning MyHost2 off, and sleeping another 10 seconds. MyHost2 computed %.0f flops so far and has an average load of %.5f.",
+ sg_host_get_computed_flops(host2), sg_host_get_avg_load(host2));
host2->turnOff();
start = simgrid::s4u::Engine::getClock();
simgrid::s4u::this_actor::sleep_for(10);
simgrid::s4u::Engine::getClock() - start, host->getSpeed(), sg_host_get_computed_flops(host));
}
+static void change_speed()
+{
+ s4u_Host* host = simgrid::s4u::Host::by_name("MyHost1");
+ simgrid::s4u::this_actor::sleep_for(10.5);
+ XBT_INFO("I slept until now, but now I'll change the speed of this host "
+ "while the other process is still computing! This should slow the computation down.");
+ host->setPstate(2);
+}
+
int main(int argc, char* argv[])
{
sg_host_load_plugin_init();
e.loadPlatform(argv[1]);
simgrid::s4u::Actor::createActor("load_test", simgrid::s4u::Host::by_name("MyHost1"), execute_load_test);
+ simgrid::s4u::Actor::createActor("change_speed", simgrid::s4u::Host::by_name("MyHost1"), change_speed);
e.run();
p This tests the HostLoad plugin (this allows the user to get the current load of a host and the computed flops)
$ ${bindir:=.}/s4u-plugin-hostload$EXEEXT ${platfdir}/energy_platform.xml "--log=root.fmt:[%10.6r]%e(%i:%P@%h)%e%m%n"
-> [ 0.000000] (1:load_test@MyHost1) Initial peak speed: 1E+08 flop/s; number of flops computed so far: 0E+00 (should be 0)
+> [ 0.000000] (1:load_test@MyHost1) Initial peak speed: 1E+08 flop/s; number of flops computed so far: 0E+00 (should be 0) and current average load: 0.00000 (should be 0)
> [ 0.000000] (1:load_test@MyHost1) Sleep for 10 seconds
> [ 10.000000] (1:load_test@MyHost1) Done sleeping 10.00s; peak speed: 1E+08 flop/s; number of flops computed so far: 0E+00 (nothing should have changed)
-> [ 10.000000] (1:load_test@MyHost1) Run a task of 1E+08 flops
-> [ 11.000000] (1:load_test@MyHost1) Done working on my task; this took 1.00s; current peak speed: 1E+08 flop/s; number of flops computed so far: 1E+08
-> [ 11.000000] (1:load_test@MyHost1) ========= Requesting pstate 2 (speed should be of 2E+07 flop/s and is of 2E+07 flop/s)
-> [ 11.000000] (1:load_test@MyHost1) Run a task of 1E+08 flops
-> [ 16.000000] (1:load_test@MyHost1) Done working on my task; this took 5.00s; current peak speed: 2E+07 flop/s; number of flops computed so far: 2E+08
-> [ 16.000000] (1:load_test@MyHost1) ========= Requesting a reset of the computation counter
-> [ 16.000000] (1:load_test@MyHost1) Sleep for 4 seconds
-> [ 20.000000] (1:load_test@MyHost1) Done sleeping 4.00 s; peak speed: 2E+07 flop/s; number of flops computed so far: 0E+00
-> [ 20.000000] (1:load_test@MyHost1) Turning MyHost2 off, and sleeping another 10 seconds. MyHost2 computed 0 flops so far.
-> [ 30.000000] (1:load_test@MyHost1) Done sleeping 10.00 s; peak speed: 2E+07 flop/s; number of flops computed so far: 0E+00
-> [ 30.000000] (0:maestro@) Total simulation time: 30.00
+> [ 10.000000] (1:load_test@MyHost1) Run a task of 2E+08 flops at current speed of 1E+08 flop/s
+> [ 10.500000] (2:change_speed@MyHost1) I slept until now, but now I'll change the speed of this host while the other process is still computing! This should slow the computation down.
+> [ 18.000000] (1:load_test@MyHost1) Done working on my task; this took 8.00s; current peak speed: 2E+07 flop/s (when I started the computation, the speed was set to 1E+08 flop/s); number of flops computed so far: 2.00E+08, average load as reported by the HostLoad plugin: 0.04167 (should be 0.04167)
+> [ 18.000000] (1:load_test@MyHost1) ========= Requesting pstate 1 (speed should be of 5E+07 flop/s and is of 5E+07 flop/s, average load is 0.04167)
+> [ 18.000000] (1:load_test@MyHost1) Run a task of 1E+08 flops
+> [ 20.000000] (1:load_test@MyHost1) Done working on my task; this took 2.00s; current peak speed: 5E+07 flop/s; number of flops computed so far: 3.00E+08
+> [ 20.000000] (1:load_test@MyHost1) ========= Requesting a reset of the computation and load counters
+> [ 20.000000] (1:load_test@MyHost1) After reset: 0E+00 flops computed; load is 0.00000
+> [ 20.000000] (1:load_test@MyHost1) Sleep for 4 seconds
+> [ 24.000000] (1:load_test@MyHost1) Done sleeping 4.00 s; peak speed: 5E+07 flop/s; number of flops computed so far: 0E+00
+> [ 24.000000] (1:load_test@MyHost1) Turning MyHost2 off, and sleeping another 10 seconds. MyHost2 computed 0 flops so far and has an average load of 0.00000.
+> [ 34.000000] (1:load_test@MyHost1) Done sleeping 10.00 s; peak speed: 5E+07 flop/s; number of flops computed so far: 0E+00
+> [ 34.000000] (0:maestro@) Total simulation time: 34.00
double current_flops = 0;
double computed_flops = 0;
double idle_time = 0;
- long theor_max_flops = 0;
+ double theor_max_flops = 0;
bool was_prev_idle = true; /* A host is idle at the beginning */
};
void HostLoad::update()
{
double now = surf_get_clock();
- if (last_updated < now) {
- /* flops == pstate_speed * cores_being_currently_used */
- computed_flops += (now - last_updated) * current_flops;
- /* Current flop per second computed by the cpu; current_flops = k * pstate_speed_in_flops, k \in {0, 1, ..., cores}
- * number of active cores */
- current_flops = host->pimpl_cpu->constraint()->get_usage();
+ /* Current flop per second computed by the cpu; current_flops = k * pstate_speed_in_flops, k \in {0, 1, ..., cores}
+ * number of active cores */
+ current_flops = host->pimpl_cpu->constraint()->get_usage();
- if (was_prev_idle) {
- idle_time += (now - last_updated);
- }
+ /* flops == pstate_speed * cores_being_currently_used */
+ computed_flops += (now - last_updated) * current_flops;
- theor_max_flops += current_speed * host->getCoreCount() * (now - last_updated);
- current_speed = host->getSpeed();
- last_updated = now;
- was_prev_idle = (current_flops == 0);
+ if (was_prev_idle) {
+ idle_time += (now - last_updated);
}
+
+ theor_max_flops += current_speed * host->getCoreCount() * (now - last_updated);
+ current_speed = host->getSpeed();
+ last_updated = now;
+ was_prev_idle = (current_flops == 0);
}
/**
double HostLoad::getAverageLoad()
{
- return getComputedFlops() / theor_max_flops;
+ if (theor_max_flops == 0) { // Avoid division by 0
+ return 0;
+ }
+
+ return computed_flops / theor_max_flops;
}
double HostLoad::getComputedFlops()
{
- update();
-
return computed_flops;
}
computed_flops = 0;
theor_max_flops = 0;
current_flops = host->pimpl_cpu->constraint()->get_usage();
+ current_speed = host->getSpeed();
was_prev_idle = (current_flops == 0);
}
}