1 files changed, 144 insertions, 0 deletions
diff --git a/src/tests/threads/mlfqs-recent-1.c b/src/tests/threads/mlfqs-recent-1.c
new file mode 100644
index 0000000..4258671
--- /dev/null
+++ b/src/tests/threads/mlfqs-recent-1.c
@@ -0,0 +1,144 @@
+/* Checks that recent_cpu is calculated properly for the case of
+   a single ready process.
+
+   The expected output is this (some margin of error is allowed):
+
+   After 2 seconds, recent_cpu is 6.40, load_avg is 0.03.
+   After 4 seconds, recent_cpu is 12.60, load_avg is 0.07.
+   After 6 seconds, recent_cpu is 18.61, load_avg is 0.10.
+   After 8 seconds, recent_cpu is 24.44, load_avg is 0.13.
+   After 10 seconds, recent_cpu is 30.08, load_avg is 0.15.
+   After 12 seconds, recent_cpu is 35.54, load_avg is 0.18.
+   After 14 seconds, recent_cpu is 40.83, load_avg is 0.21.
+   After 16 seconds, recent_cpu is 45.96, load_avg is 0.24.
+   After 18 seconds, recent_cpu is 50.92, load_avg is 0.26.
+   After 20 seconds, recent_cpu is 55.73, load_avg is 0.29.
+   After 22 seconds, recent_cpu is 60.39, load_avg is 0.31.
+   After 24 seconds, recent_cpu is 64.90, load_avg is 0.33.
+   After 26 seconds, recent_cpu is 69.27, load_avg is 0.35.
+   After 28 seconds, recent_cpu is 73.50, load_avg is 0.38.
+   After 30 seconds, recent_cpu is 77.60, load_avg is 0.40.
+   After 32 seconds, recent_cpu is 81.56, load_avg is 0.42.
+   After 34 seconds, recent_cpu is 85.40, load_avg is 0.44.
+   After 36 seconds, recent_cpu is 89.12, load_avg is 0.45.
+   After 38 seconds, recent_cpu is 92.72, load_avg is 0.47.
+   After 40 seconds, recent_cpu is 96.20, load_avg is 0.49.
+   After 42 seconds, recent_cpu is 99.57, load_avg is 0.51.
+   After 44 seconds, recent_cpu is 102.84, load_avg is 0.52.
+   After 46 seconds, recent_cpu is 106.00, load_avg is 0.54.
+   After 48 seconds, recent_cpu is 109.06, load_avg is 0.55.
+   After 50 seconds, recent_cpu is 112.02, load_avg is 0.57.
+   After 52 seconds, recent_cpu is 114.89, load_avg is 0.58.
+   After 54 seconds, recent_cpu is 117.66, load_avg is 0.60.
+   After 56 seconds, recent_cpu is 120.34, load_avg is 0.61.
+   After 58 seconds, recent_cpu is 122.94, load_avg is 0.62.
+   After 60 seconds, recent_cpu is 125.46, load_avg is 0.64.
+   After 62 seconds, recent_cpu is 127.89, load_avg is 0.65.
+   After 64 seconds, recent_cpu is 130.25, load_avg is 0.66.
+   After 66 seconds, recent_cpu is 132.53, load_avg is 0.67.
+   After 68 seconds, recent_cpu is 134.73, load_avg is 0.68.
+   After 70 seconds, recent_cpu is 136.86, load_avg is 0.69.
+   After 72 seconds, recent_cpu is 138.93, load_avg is 0.70.
+   After 74 seconds, recent_cpu is 140.93, load_avg is 0.71.
+   After 76 seconds, recent_cpu is 142.86, load_avg is 0.72.
+   After 78 seconds, recent_cpu is 144.73, load_avg is 0.73.
+   After 80 seconds, recent_cpu is 146.54, load_avg is 0.74.
+   After 82 seconds, recent_cpu is 148.29, load_avg is 0.75.
+   After 84 seconds, recent_cpu is 149.99, load_avg is 0.76.
+   After 86 seconds, recent_cpu is 151.63, load_avg is 0.76.
+   After 88 seconds, recent_cpu is 153.21, load_avg is 0.77.
+   After 90 seconds, recent_cpu is 154.75, load_avg is 0.78.
+   After 92 seconds, recent_cpu is 156.23, load_avg is 0.79.
+   After 94 seconds, recent_cpu is 157.67, load_avg is 0.79.
+   After 96 seconds, recent_cpu is 159.06, load_avg is 0.80.
+   After 98 seconds, recent_cpu is 160.40, load_avg is 0.81.
+   After 100 seconds, recent_cpu is 161.70, load_avg is 0.81.
+   After 102 seconds, recent_cpu is 162.96, load_avg is 0.82.
+   After 104 seconds, recent_cpu is 164.18, load_avg is 0.83.
+   After 106 seconds, recent_cpu is 165.35, load_avg is 0.83.
+   After 108 seconds, recent_cpu is 166.49, load_avg is 0.84.
+   After 110 seconds, recent_cpu is 167.59, load_avg is 0.84.
+   After 112 seconds, recent_cpu is 168.66, load_avg is 0.85.
+   After 114 seconds, recent_cpu is 169.69, load_avg is 0.85.
+   After 116 seconds, recent_cpu is 170.69, load_avg is 0.86.
+   After 118 seconds, recent_cpu is 171.65, load_avg is 0.86.
+   After 120 seconds, recent_cpu is 172.58, load_avg is 0.87.
+   After 122 seconds, recent_cpu is 173.49, load_avg is 0.87.
+   After 124 seconds, recent_cpu is 174.36, load_avg is 0.88.
+   After 126 seconds, recent_cpu is 175.20, load_avg is 0.88.
+   After 128 seconds, recent_cpu is 176.02, load_avg is 0.88.
+   After 130 seconds, recent_cpu is 176.81, load_avg is 0.89.
+   After 132 seconds, recent_cpu is 177.57, load_avg is 0.89.
+   After 134 seconds, recent_cpu is 178.31, load_avg is 0.89.
+   After 136 seconds, recent_cpu is 179.02, load_avg is 0.90.
+   After 138 seconds, recent_cpu is 179.72, load_avg is 0.90.
+   After 140 seconds, recent_cpu is 180.38, load_avg is 0.90.
+   After 142 seconds, recent_cpu is 181.03, load_avg is 0.91.
+   After 144 seconds, recent_cpu is 181.65, load_avg is 0.91.
+   After 146 seconds, recent_cpu is 182.26, load_avg is 0.91.
+   After 148 seconds, recent_cpu is 182.84, load_avg is 0.92.
+   After 150 seconds, recent_cpu is 183.41, load_avg is 0.92.
+   After 152 seconds, recent_cpu is 183.96, load_avg is 0.92.
+   After 154 seconds, recent_cpu is 184.49, load_avg is 0.92.
+   After 156 seconds, recent_cpu is 185.00, load_avg is 0.93.
+   After 158 seconds, recent_cpu is 185.49, load_avg is 0.93.
+   After 160 seconds, recent_cpu is 185.97, load_avg is 0.93.
+   After 162 seconds, recent_cpu is 186.43, load_avg is 0.93.
+   After 164 seconds, recent_cpu is 186.88, load_avg is 0.94.
+   After 166 seconds, recent_cpu is 187.31, load_avg is 0.94.
+   After 168 seconds, recent_cpu is 187.73, load_avg is 0.94.
+   After 170 seconds, recent_cpu is 188.14, load_avg is 0.94.
+   After 172 seconds, recent_cpu is 188.53, load_avg is 0.94.
+   After 174 seconds, recent_cpu is 188.91, load_avg is 0.95.
+   After 176 seconds, recent_cpu is 189.27, load_avg is 0.95.
+   After 178 seconds, recent_cpu is 189.63, load_avg is 0.95.
+   After 180 seconds, recent_cpu is 189.97, load_avg is 0.95.
+*/   
+
+#include <stdio.h>
+#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"
+
+/* Sensitive to assumption that recent_cpu updates happen exactly
+   when timer_ticks() % TIMER_FREQ == 0. */
+
+void
+test_mlfqs_recent_1 (void) 
+{
+  int64_t start_time;
+  int last_elapsed = 0;
+  
+  ASSERT (thread_mlfqs);
+
+  do 
+    {
+      msg ("Sleeping 10 seconds to allow recent_cpu to decay, please wait...");
+      start_time = timer_ticks ();
+      timer_sleep (DIV_ROUND_UP (start_time, TIMER_FREQ) - start_time
+                   + 10 * TIMER_FREQ);
+    }
+  while (thread_get_recent_cpu () > 700);
+
+  start_time = timer_ticks ();
+  for (;;) 
+    {
+      int elapsed = timer_elapsed (start_time);
+      if (elapsed % (TIMER_FREQ * 2) == 0 && elapsed > last_elapsed) 
+        {
+          int recent_cpu = thread_get_recent_cpu ();
+          int load_avg = thread_get_load_avg ();
+          int elapsed_seconds = elapsed / TIMER_FREQ;
+          msg ("After %d seconds, recent_cpu is %d.%02d, load_avg is %d.%02d.",
+               elapsed_seconds,
+               recent_cpu / 100, recent_cpu % 100,
+               load_avg / 100, load_avg % 100);
+          if (elapsed_seconds >= 180)
+            break;
+        } 
+      last_elapsed = elapsed;
+    }
+}