61 lines
1.7 KiB
C
61 lines
1.7 KiB
C
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/* Verifies that a single busy thread raises the load average to
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0.5 in 38 to 45 seconds. The expected time is 42 seconds, as
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you can verify:
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perl -e '$i++,$a=(59*$a+1)/60while$a<=.5;print "$i\n"'
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Then, verifies that 10 seconds of inactivity drop the load
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average back below 0.5 again. */
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#include <stdio.h>
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#include "tests/threads/tests.h"
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#include "threads/init.h"
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#include "threads/malloc.h"
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#include "threads/synch.h"
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#include "threads/thread.h"
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#include "devices/timer.h"
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void
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test_mlfqs_load_1 (void)
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{
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int64_t start_time;
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int elapsed;
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int load_avg;
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ASSERT (thread_mlfqs);
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msg ("spinning for up to 45 seconds, please wait...");
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start_time = timer_ticks ();
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for (;;)
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{
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load_avg = thread_get_load_avg ();
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ASSERT (load_avg >= 0);
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elapsed = timer_elapsed (start_time) / TIMER_FREQ;
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if (load_avg > 100)
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fail ("load average is %d.%02d "
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"but should be between 0 and 1 (after %d seconds)",
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load_avg / 100, load_avg % 100, elapsed);
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else if (load_avg > 50)
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break;
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else if (elapsed > 45)
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fail ("load average stayed below 0.5 for more than 45 seconds");
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}
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if (elapsed < 38)
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fail ("load average took only %d seconds to rise above 0.5", elapsed);
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msg ("load average rose to 0.5 after %d seconds", elapsed);
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msg ("sleeping for another 10 seconds, please wait...");
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timer_sleep (TIMER_FREQ * 10);
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load_avg = thread_get_load_avg ();
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if (load_avg < 0)
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fail ("load average fell below 0");
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if (load_avg > 50)
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fail ("load average stayed above 0.5 for more than 10 seconds");
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msg ("load average fell back below 0.5 (to %d.%02d)",
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load_avg / 100, load_avg % 100);
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pass ();
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}
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