/* Starts 60 threads that each sleep for 10 seconds, then spin in
a tight loop for 60 seconds, and sleep for another 60 seconds.
Every 2 seconds after the initial sleep, the main thread
prints the load average.
The expected output is this (some margin of error is allowed):
After 0 seconds, load average=1.00.
After 2 seconds, load average=2.95.
After 4 seconds, load average=4.84.
After 6 seconds, load average=6.66.
After 8 seconds, load average=8.42.
After 10 seconds, load average=10.13.
After 12 seconds, load average=11.78.
After 14 seconds, load average=13.37.
After 16 seconds, load average=14.91.
After 18 seconds, load average=16.40.
After 20 seconds, load average=17.84.
After 22 seconds, load average=19.24.
After 24 seconds, load average=20.58.
After 26 seconds, load average=21.89.
After 28 seconds, load average=23.15.
After 30 seconds, load average=24.37.
After 32 seconds, load average=25.54.
After 34 seconds, load average=26.68.
After 36 seconds, load average=27.78.
After 38 seconds, load average=28.85.
After 40 seconds, load average=29.88.
After 42 seconds, load average=30.87.
After 44 seconds, load average=31.84.
After 46 seconds, load average=32.77.
After 48 seconds, load average=33.67.
After 50 seconds, load average=34.54.
After 52 seconds, load average=35.38.
After 54 seconds, load average=36.19.
After 56 seconds, load average=36.98.
After 58 seconds, load average=37.74.
After 60 seconds, load average=37.48.
After 62 seconds, load average=36.24.
After 64 seconds, load average=35.04.
After 66 seconds, load average=33.88.
After 68 seconds, load average=32.76.
After 70 seconds, load average=31.68.
After 72 seconds, load average=30.63.
After 74 seconds, load average=29.62.
After 76 seconds, load average=28.64.
After 78 seconds, load average=27.69.
After 80 seconds, load average=26.78.
After 82 seconds, load average=25.89.
After 84 seconds, load average=25.04.
After 86 seconds, load average=24.21.
After 88 seconds, load average=23.41.
After 90 seconds, load average=22.64.
After 92 seconds, load average=21.89.
After 94 seconds, load average=21.16.
After 96 seconds, load average=20.46.
After 98 seconds, load average=19.79.
After 100 seconds, load average=19.13.
After 102 seconds, load average=18.50.
After 104 seconds, load average=17.89.
After 106 seconds, load average=17.30.
After 108 seconds, load average=16.73.
After 110 seconds, load average=16.17.
After 112 seconds, load average=15.64.
After 114 seconds, load average=15.12.
After 116 seconds, load average=14.62.
After 118 seconds, load average=14.14.
After 120 seconds, load average=13.67.
After 122 seconds, load average=13.22.
After 124 seconds, load average=12.78.
After 126 seconds, load average=12.36.
After 128 seconds, load average=11.95.
After 130 seconds, load average=11.56.
After 132 seconds, load average=11.17.
After 134 seconds, load average=10.80.
After 136 seconds, load average=10.45.
After 138 seconds, load average=10.10.
After 140 seconds, load average=9.77.
After 142 seconds, load average=9.45.
After 144 seconds, load average=9.13.
After 146 seconds, load average=8.83.
After 148 seconds, load average=8.54.
After 150 seconds, load average=8.26.
After 152 seconds, load average=7.98.
After 154 seconds, load average=7.72.
After 156 seconds, load average=7.47.
After 158 seconds, load average=7.22.
After 160 seconds, load average=6.98.
After 162 seconds, load average=6.75.
After 164 seconds, load average=6.53.
After 166 seconds, load average=6.31.
After 168 seconds, load average=6.10.
After 170 seconds, load average=5.90.
After 172 seconds, load average=5.70.
After 174 seconds, load average=5.52.
After 176 seconds, load average=5.33.
After 178 seconds, load average=5.16.
*/
#include
#include “tests/threads/tests.h”
#include “threads/init.h”
#include “threads/malloc.h”
#include “threads/synch.h”
#include “threads/thread.h”
#include “devices/timer.h”
static int64_t start_time;
static void load_thread (void *aux);
#define THREAD_CNT 60
void
test_mlfqs_load_60 (void)
{
int i;
ASSERT (thread_mlfqs);
start_time = timer_ticks ();
msg (“Starting %d niced load threads…”, THREAD_CNT);
for (i = 0; i < THREAD_CNT; i++)
{
char name[16];
snprintf(name, sizeof name, "load %d", i);
thread_create (name, PRI_DEFAULT, load_thread, NULL);
}
msg ("Starting threads took %d seconds.",
timer_elapsed (start_time) / TIMER_FREQ);
for (i = 0; i < 90; i++)
{
int64_t sleep_until = start_time + TIMER_FREQ * (2 * i + 10);
int load_avg;
timer_sleep (sleep_until - timer_ticks ());
load_avg = thread_get_load_avg ();
msg ("After %d seconds, load average=%d.%02d.",
i * 2, load_avg / 100, load_avg % 100);
}
}
static void
load_thread (void *aux UNUSED)
{
int64_t sleep_time = 10 * TIMER_FREQ;
int64_t spin_time = sleep_time + 60 * TIMER_FREQ;
int64_t exit_time = spin_time + 60 * TIMER_FREQ;
thread_set_nice (20);
timer_sleep (sleep_time - timer_elapsed (start_time));
while (timer_elapsed (start_time) < spin_time)
continue;
timer_sleep (exit_time - timer_elapsed (start_time));
}