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);
}
/**
- * WARNING: This function does not guarantee that you have the real load at any time;
+ * WARNING: This function does not guarantee that you have the real load at any time
* imagine all actions on your CPU terminate at time t. Your load is then 0. Then
* you query the load (still 0) and then another action starts (still at time t!).
* This means that the load was never really 0 (because the time didn't advance) but
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);
}
}