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Diffstat (limited to 'src/lib/util/test_scheduler_delay.c')
-rw-r--r-- | src/lib/util/test_scheduler_delay.c | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/src/lib/util/test_scheduler_delay.c b/src/lib/util/test_scheduler_delay.c new file mode 100644 index 000000000..41990272a --- /dev/null +++ b/src/lib/util/test_scheduler_delay.c | |||
@@ -0,0 +1,96 @@ | |||
1 | /* | ||
2 | This file is part of GNUnet. | ||
3 | Copyright (C) 2001-2013 GNUnet e.V. | ||
4 | |||
5 | GNUnet is free software: you can redistribute it and/or modify it | ||
6 | under the terms of the GNU Affero General Public License as published | ||
7 | by the Free Software Foundation, either version 3 of the License, | ||
8 | or (at your option) any later version. | ||
9 | |||
10 | GNUnet is distributed in the hope that it will be useful, but | ||
11 | WITHOUT ANY WARRANTY; without even the implied warranty of | ||
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
13 | Affero General Public License for more details. | ||
14 | |||
15 | You should have received a copy of the GNU Affero General Public License | ||
16 | along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
17 | |||
18 | SPDX-License-Identifier: AGPL3.0-or-later | ||
19 | */ | ||
20 | /** | ||
21 | * @file util/test_scheduler_delay.c | ||
22 | * @brief testcase for delay of scheduler, measures how | ||
23 | * precise the timers are. Expect values between 0.2 and 2 ms on | ||
24 | * modern machines. | ||
25 | */ | ||
26 | |||
27 | #include "platform.h" | ||
28 | #include "gnunet_util_lib.h" | ||
29 | |||
30 | static struct GNUNET_TIME_Absolute target; | ||
31 | |||
32 | static int i; | ||
33 | |||
34 | static unsigned long long cumDelta; | ||
35 | |||
36 | #define INCR 47 | ||
37 | |||
38 | #define MAXV 5000 | ||
39 | |||
40 | |||
41 | /** | ||
42 | * Signature of the main function of a task. | ||
43 | * | ||
44 | * @param cls closure | ||
45 | */ | ||
46 | static void | ||
47 | test_task (void *cls) | ||
48 | { | ||
49 | struct GNUNET_TIME_Absolute now; | ||
50 | |||
51 | now = GNUNET_TIME_absolute_get (); | ||
52 | if (now.abs_value_us > target.abs_value_us) | ||
53 | cumDelta += (now.abs_value_us - target.abs_value_us); | ||
54 | else | ||
55 | cumDelta += (target.abs_value_us - now.abs_value_us); | ||
56 | target = | ||
57 | GNUNET_TIME_relative_to_absolute (GNUNET_TIME_relative_multiply | ||
58 | (GNUNET_TIME_UNIT_MICROSECONDS, i)); | ||
59 | fprintf (stderr, "%s", "."); | ||
60 | if (i > MAXV) | ||
61 | { | ||
62 | fprintf (stderr, "%s", "\n"); | ||
63 | return; | ||
64 | } | ||
65 | GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_multiply | ||
66 | (GNUNET_TIME_UNIT_MICROSECONDS, i), | ||
67 | &test_task, | ||
68 | NULL); | ||
69 | i += INCR; | ||
70 | } | ||
71 | |||
72 | |||
73 | int | ||
74 | main (int argc, char *argv[]) | ||
75 | { | ||
76 | GNUNET_log_setup ("test-scheduler-delay", | ||
77 | "WARNING", | ||
78 | NULL); | ||
79 | target = GNUNET_TIME_absolute_get (); | ||
80 | GNUNET_SCHEDULER_run (&test_task, NULL); | ||
81 | fprintf (stdout, | ||
82 | "Sleep precision: %llu microseconds (average delta). ", | ||
83 | cumDelta / (MAXV / INCR)); | ||
84 | if (cumDelta <= 500 * MAXV / INCR) | ||
85 | fprintf (stdout, "%s", "Timer precision is excellent.\n"); | ||
86 | else if (cumDelta <= 5000 * MAXV / INCR) /* 5 ms average deviation */ | ||
87 | fprintf (stdout, "%s", "Timer precision is good.\n"); | ||
88 | else if (cumDelta > 25000 * MAXV / INCR) | ||
89 | fprintf (stdout, "%s", "Timer precision is awful.\n"); | ||
90 | else | ||
91 | fprintf (stdout, "%s", "Timer precision is acceptable.\n"); | ||
92 | return 0; | ||
93 | } | ||
94 | |||
95 | |||
96 | /* end of test_scheduler_delay.c */ | ||