aboutsummaryrefslogtreecommitdiff
path: root/src/test/scheduler_tests.cpp
blob: 7d26840b73d3b681a406fc145b028a48acb85cd1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
// Copyright (c) 2012-2019 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#include <random.h>
#include <scheduler.h>
#include <util/time.h>

#include <boost/thread.hpp>
#include <boost/test/unit_test.hpp>

BOOST_AUTO_TEST_SUITE(scheduler_tests)

static void microTask(CScheduler& s, boost::mutex& mutex, int& counter, int delta, std::chrono::system_clock::time_point rescheduleTime)
{
    {
        boost::unique_lock<boost::mutex> lock(mutex);
        counter += delta;
    }
    std::chrono::system_clock::time_point noTime = std::chrono::system_clock::time_point::min();
    if (rescheduleTime != noTime) {
        CScheduler::Function f = std::bind(&microTask, std::ref(s), std::ref(mutex), std::ref(counter), -delta + 1, noTime);
        s.schedule(f, rescheduleTime);
    }
}

BOOST_AUTO_TEST_CASE(manythreads)
{
    // Stress test: hundreds of microsecond-scheduled tasks,
    // serviced by 10 threads.
    //
    // So... ten shared counters, which if all the tasks execute
    // properly will sum to the number of tasks done.
    // Each task adds or subtracts a random amount from one of the
    // counters, and then schedules another task 0-1000
    // microseconds in the future to subtract or add from
    // the counter -random_amount+1, so in the end the shared
    // counters should sum to the number of initial tasks performed.
    CScheduler microTasks;

    boost::mutex counterMutex[10];
    int counter[10] = { 0 };
    FastRandomContext rng{/* fDeterministic */ true};
    auto zeroToNine = [](FastRandomContext& rc) -> int { return rc.randrange(10); }; // [0, 9]
    auto randomMsec = [](FastRandomContext& rc) -> int { return -11 + (int)rc.randrange(1012); }; // [-11, 1000]
    auto randomDelta = [](FastRandomContext& rc) -> int { return -1000 + (int)rc.randrange(2001); }; // [-1000, 1000]

    std::chrono::system_clock::time_point start = std::chrono::system_clock::now();
    std::chrono::system_clock::time_point now = start;
    std::chrono::system_clock::time_point first, last;
    size_t nTasks = microTasks.getQueueInfo(first, last);
    BOOST_CHECK(nTasks == 0);

    for (int i = 0; i < 100; ++i) {
        std::chrono::system_clock::time_point t = now + std::chrono::microseconds(randomMsec(rng));
        std::chrono::system_clock::time_point tReschedule = now + std::chrono::microseconds(500 + randomMsec(rng));
        int whichCounter = zeroToNine(rng);
        CScheduler::Function f = std::bind(&microTask, std::ref(microTasks),
                                             std::ref(counterMutex[whichCounter]), std::ref(counter[whichCounter]),
                                             randomDelta(rng), tReschedule);
        microTasks.schedule(f, t);
    }
    nTasks = microTasks.getQueueInfo(first, last);
    BOOST_CHECK(nTasks == 100);
    BOOST_CHECK(first < last);
    BOOST_CHECK(last > now);

    // As soon as these are created they will start running and servicing the queue
    boost::thread_group microThreads;
    for (int i = 0; i < 5; i++)
        microThreads.create_thread(std::bind(&CScheduler::serviceQueue, &microTasks));

    UninterruptibleSleep(std::chrono::microseconds{600});
    now = std::chrono::system_clock::now();

    // More threads and more tasks:
    for (int i = 0; i < 5; i++)
        microThreads.create_thread(std::bind(&CScheduler::serviceQueue, &microTasks));
    for (int i = 0; i < 100; i++) {
        std::chrono::system_clock::time_point t = now + std::chrono::microseconds(randomMsec(rng));
        std::chrono::system_clock::time_point tReschedule = now + std::chrono::microseconds(500 + randomMsec(rng));
        int whichCounter = zeroToNine(rng);
        CScheduler::Function f = std::bind(&microTask, std::ref(microTasks),
                                             std::ref(counterMutex[whichCounter]), std::ref(counter[whichCounter]),
                                             randomDelta(rng), tReschedule);
        microTasks.schedule(f, t);
    }

    // Drain the task queue then exit threads
    microTasks.stop(true);
    microThreads.join_all(); // ... wait until all the threads are done

    int counterSum = 0;
    for (int i = 0; i < 10; i++) {
        BOOST_CHECK(counter[i] != 0);
        counterSum += counter[i];
    }
    BOOST_CHECK_EQUAL(counterSum, 200);
}

BOOST_AUTO_TEST_CASE(singlethreadedscheduler_ordered)
{
    CScheduler scheduler;

    // each queue should be well ordered with respect to itself but not other queues
    SingleThreadedSchedulerClient queue1(&scheduler);
    SingleThreadedSchedulerClient queue2(&scheduler);

    // create more threads than queues
    // if the queues only permit execution of one task at once then
    // the extra threads should effectively be doing nothing
    // if they don't we'll get out of order behaviour
    boost::thread_group threads;
    for (int i = 0; i < 5; ++i) {
        threads.create_thread(std::bind(&CScheduler::serviceQueue, &scheduler));
    }

    // these are not atomic, if SinglethreadedSchedulerClient prevents
    // parallel execution at the queue level no synchronization should be required here
    int counter1 = 0;
    int counter2 = 0;

    // just simply count up on each queue - if execution is properly ordered then
    // the callbacks should run in exactly the order in which they were enqueued
    for (int i = 0; i < 100; ++i) {
        queue1.AddToProcessQueue([i, &counter1]() {
            bool expectation = i == counter1++;
            assert(expectation);
        });

        queue2.AddToProcessQueue([i, &counter2]() {
            bool expectation = i == counter2++;
            assert(expectation);
        });
    }

    // finish up
    scheduler.stop(true);
    threads.join_all();

    BOOST_CHECK_EQUAL(counter1, 100);
    BOOST_CHECK_EQUAL(counter2, 100);
}

BOOST_AUTO_TEST_CASE(mockforward)
{
    CScheduler scheduler;

    int counter{0};
    CScheduler::Function dummy = [&counter]{counter++;};

    // schedule jobs for 2, 5 & 8 minutes into the future
    int64_t min_in_milli = 60*1000;
    scheduler.scheduleFromNow(dummy, 2*min_in_milli);
    scheduler.scheduleFromNow(dummy, 5*min_in_milli);
    scheduler.scheduleFromNow(dummy, 8*min_in_milli);

    // check taskQueue
    std::chrono::system_clock::time_point first, last;
    size_t num_tasks = scheduler.getQueueInfo(first, last);
    BOOST_CHECK_EQUAL(num_tasks, 3ul);

    std::thread scheduler_thread([&]() { scheduler.serviceQueue(); });

    // bump the scheduler forward 5 minutes
    scheduler.MockForward(std::chrono::seconds(5*60));

    // ensure scheduler has chance to process all tasks queued for before 1 ms from now.
    scheduler.scheduleFromNow([&scheduler]{ scheduler.stop(false); }, 1);
    scheduler_thread.join();

    // check that the queue only has one job remaining
    num_tasks = scheduler.getQueueInfo(first, last);
    BOOST_CHECK_EQUAL(num_tasks, 1ul);

    // check that the dummy function actually ran
    BOOST_CHECK_EQUAL(counter, 2);

    // check that the time of the remaining job has been updated
    std::chrono::system_clock::time_point now = std::chrono::system_clock::now();
    int delta = std::chrono::duration_cast<std::chrono::seconds>(first - now).count();
    // should be between 2 & 3 minutes from now
    BOOST_CHECK(delta > 2*60 && delta < 3*60);
}

BOOST_AUTO_TEST_SUITE_END()