5 sub mlfqs_expected_load {
6 my ($ready, $recent_delta) = @_;
11 for my $i (0...$#$ready) {
12 $load_avg = (59/60) * $load_avg + (1/60) * $ready->[$i];
13 push (@load_avg, $load_avg);
15 if (defined $recent_delta->[$i]) {
16 my ($twice_load) = $load_avg * 2;
17 my ($load_factor) = $twice_load / ($twice_load + 1);
18 $recent_cpu = ($recent_cpu + $recent_delta->[$i]) * $load_factor;
19 push (@recent_cpu, $recent_cpu);
22 return (\@load_avg, \@recent_cpu);
25 sub mlfqs_expected_ticks {
27 my ($thread_cnt) = scalar (@nice);
28 my (@recent_cpu) = (0) x $thread_cnt;
29 my (@slices) = (0) x $thread_cnt;
30 my (@fifo) = (0) x $thread_cnt;
35 # Update load average.
36 $load_avg = (59/60) * $load_avg + (1/60) * $thread_cnt;
39 my ($twice_load) = $load_avg * 2;
40 my ($load_factor) = $twice_load / ($twice_load + 1);
41 $recent_cpu[$_] = $recent_cpu[$_] * $load_factor + $nice[$_]
42 foreach 0...($thread_cnt - 1);
47 foreach my $j (0...($thread_cnt - 1)) {
48 my ($priority) = int ($recent_cpu[$j] / 4 + $nice[$j] * 2);
49 $priority = 0 if $priority < 0;
50 $priority = 63 if $priority > 63;
51 push (@priority, $priority);
54 # Choose thread to run.
56 for my $j (1...$#priority) {
57 if ($priority[$j] < $priority[$max]
58 || ($priority[$j] == $priority[$max]
59 && $fifo[$j] < $fifo[$max])) {
63 $fifo[$max] = $next_fifo++;
66 $recent_cpu[$max] += 4;
72 sub check_mlfqs_fair {
73 my ($nice, $maxdiff) = @_;
75 my (@output) = read_text_file ("$test.output");
76 common_checks (@output);
77 @output = get_core_output (@output);
82 my ($id, $count) = /Thread (\d+) received (\d+) ticks\./ or next;
83 $actual[$id] = $count;
86 my (@expected) = mlfqs_expected_ticks (@$nice);
87 mlfqs_compare ("thread", "%d",
88 \@actual, \@expected, $maxdiff, [0, $#$nice, 1],
89 "Some tick counts were missing or differed from those "
90 . "expected by more than $maxdiff.");
95 my ($indep_var, $format,
96 $actual_ref, $expected_ref, $maxdiff, $t_range, $message) = @_;
97 my ($t_min, $t_max, $t_step) = @$t_range;
100 for (my ($t) = $t_min; $t <= $t_max; $t += $t_step) {
101 my ($actual) = $actual_ref->[$t];
102 my ($expected) = $expected_ref->[$t];
104 if !defined ($actual) || abs ($actual - $expected) > $maxdiff + .01;
109 mlfqs_row ($indep_var, "actual", "<->", "expected", "explanation");
110 mlfqs_row ("------", "--------", "---", "--------", '-' x 40);
111 for (my ($t) = $t_min; $t <= $t_max; $t += $t_step) {
112 my ($actual) = $actual_ref->[$t];
113 my ($expected) = $expected_ref->[$t];
114 my ($diff, $rationale);
115 if (!defined $actual) {
118 $rationale = 'Missing value.';
120 my ($delta) = abs ($actual - $expected);
121 if ($delta > $maxdiff + .01) {
122 my ($excess) = $delta - $maxdiff;
123 if ($actual > $expected) {
125 $rationale = sprintf "Too big, by $format.", $excess;
128 $rationale = sprintf "Too small, by $format.", $excess;
134 $actual = sprintf ($format, $actual);
136 $expected = sprintf ($format, $expected);
137 mlfqs_row ($t, $actual, $diff, $expected, $rationale);
143 printf "%6s %8s %3s %-8s %s\n", @_;