src/test/scheduler_tests.cpp

   1 // Copyright (c) 2012-2013 The Bitcoin Core developers
   2 // Distributed under the MIT software license, see the accompanying
   3 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
   4
   5 #include "random.h"
   6 #include "scheduler.h"
   7
   8 #include "test/test_bitcoin.h"
   9
  10 #include <boost/bind.hpp>
  11 #include <boost/random/mersenne_twister.hpp>
  12 #include <boost/random/uniform_int_distribution.hpp>
  13 #include <boost/thread.hpp>
  14 #include <boost/test/unit_test.hpp>
  15
  16 BOOST_AUTO_TEST_SUITE(scheduler_tests)
  17
  18 static void microTask(CScheduler& s, boost::mutex& mutex, int& counter, int delta, boost::chrono::system_clock::time_point rescheduleTime)
  19 {
  20     {
  21         boost::unique_lock<boost::mutex> lock(mutex);
  22         counter += delta;
  23     }
  24     boost::chrono::system_clock::time_point noTime = boost::chrono::system_clock::time_point::min();
  25     if (rescheduleTime != noTime) {
  26         CScheduler::Function f = boost::bind(&microTask, boost::ref(s), boost::ref(mutex), boost::ref(counter), -delta + 1, noTime);
  27         s.schedule(f, rescheduleTime);
  28     }
  29 }
  30
  31 static void MicroSleep(uint64_t n)
  32 {
  33     boost::this_thread::sleep_for(boost::chrono::microseconds(n));
  34 }
  35
  36 BOOST_AUTO_TEST_CASE(manythreads)
  37 {
  38     seed_insecure_rand(false);
  39
  40     // Stress test: hundreds of microsecond-scheduled tasks,
  41     // serviced by 10 threads.
  42     //
  43     // So... ten shared counters, which if all the tasks execute
  44     // properly will sum to the number of tasks done.
  45     // Each task adds or subtracts from one of the counters a
  46     // random amount, and then schedules another task 0-1000
  47     // microseconds in the future to subtract or add from
  48     // the counter -random_amount+1, so in the end the shared
  49     // counters should sum to the number of initial tasks performed.
  50     CScheduler microTasks;
  51
  52     boost::mutex counterMutex[10];
  53     int counter[10] = { 0 };
  54     boost::random::mt19937 rng(insecure_rand());
  55     boost::random::uniform_int_distribution<> zeroToNine(0, 9);
  56     boost::random::uniform_int_distribution<> randomMsec(-11, 1000);
  57     boost::random::uniform_int_distribution<> randomDelta(-1000, 1000);
  58
  59     boost::chrono::system_clock::time_point start = boost::chrono::system_clock::now();
  60     boost::chrono::system_clock::time_point now = start;
  61     boost::chrono::system_clock::time_point first, last;
  62     size_t nTasks = microTasks.getQueueInfo(first, last);
  63     BOOST_CHECK(nTasks == 0);
  64
  65     for (int i = 0; i < 100; i++) {
  66         boost::chrono::system_clock::time_point t = now + boost::chrono::microseconds(randomMsec(rng));
  67         boost::chrono::system_clock::time_point tReschedule = now + boost::chrono::microseconds(500 + randomMsec(rng));
  68         int whichCounter = zeroToNine(rng);
  69         CScheduler::Function f = boost::bind(&microTask, boost::ref(microTasks),
  70                                              boost::ref(counterMutex[whichCounter]), boost::ref(counter[whichCounter]),
  71                                              randomDelta(rng), tReschedule);
  72         microTasks.schedule(f, t);
  73     }
  74     nTasks = microTasks.getQueueInfo(first, last);
  75     BOOST_CHECK(nTasks == 100);
  76     BOOST_CHECK(first < last);
  77     BOOST_CHECK(last > now);
  78
  79     // As soon as these are created they will start running and servicing the queue
  80     boost::thread_group microThreads;
  81     for (int i = 0; i < 5; i++)
  82         microThreads.create_thread(boost::bind(&CScheduler::serviceQueue, &microTasks));
  83
  84     MicroSleep(600);
  85     now = boost::chrono::system_clock::now();
  86
  87     // More threads and more tasks:
  88     for (int i = 0; i < 5; i++)
  89         microThreads.create_thread(boost::bind(&CScheduler::serviceQueue, &microTasks));
  90     for (int i = 0; i < 100; i++) {
  91         boost::chrono::system_clock::time_point t = now + boost::chrono::microseconds(randomMsec(rng));
  92         boost::chrono::system_clock::time_point tReschedule = now + boost::chrono::microseconds(500 + randomMsec(rng));
  93         int whichCounter = zeroToNine(rng);
  94         CScheduler::Function f = boost::bind(&microTask, boost::ref(microTasks),
  95                                              boost::ref(counterMutex[whichCounter]), boost::ref(counter[whichCounter]),
  96                                              randomDelta(rng), tReschedule);
  97         microTasks.schedule(f, t);
  98     }
  99
 100     // Drain the task queue then exit threads
 101     microTasks.stop(true);
 102     microThreads.join_all(); // ... wait until all the threads are done
 103
 104     int counterSum = 0;
 105     for (int i = 0; i < 10; i++) {
 106         BOOST_CHECK(counter[i] != 0);
 107         counterSum += counter[i];
 108     }
 109     BOOST_CHECK_EQUAL(counterSum, 200);
 110 }
 111
 112 BOOST_AUTO_TEST_SUITE_END()