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 #if defined(HAVE_WORKING_BOOST_SLEEP_FOR)
  34     boost::this_thread::sleep_for(boost::chrono::microseconds(n));
  35 #elif defined(HAVE_WORKING_BOOST_SLEEP)
  36     boost::this_thread::sleep(boost::posix_time::microseconds(n));
  37 #else
  38     //should never get here
  39     #error missing boost sleep implementation
  40 #endif
  41 }
  42
  43 BOOST_AUTO_TEST_CASE(manythreads)
  44 {
  45     // Stress test: hundreds of microsecond-scheduled tasks,
  46     // serviced by 10 threads.
  47     //
  48     // So... ten shared counters, which if all the tasks execute
  49     // properly will sum to the number of tasks done.
  50     // Each task adds or subtracts from one of the counters a
  51     // random amount, and then schedules another task 0-1000
  52     // microseconds in the future to subtract or add from
  53     // the counter -random_amount+1, so in the end the shared
  54     // counters should sum to the number of initial tasks performed.
  55     CScheduler microTasks;
  56
  57     boost::thread_group microThreads;
  58     for (int i = 0; i < 5; i++)
  59         microThreads.create_thread(boost::bind(&CScheduler::serviceQueue, &microTasks));
  60
  61     boost::mutex counterMutex[10];
  62     int counter[10] = { 0 };
  63     boost::random::mt19937 rng(insecure_rand());
  64     boost::random::uniform_int_distribution<> zeroToNine(0, 9);
  65     boost::random::uniform_int_distribution<> randomMsec(-11, 1000);
  66     boost::random::uniform_int_distribution<> randomDelta(-1000, 1000);
  67
  68     boost::chrono::system_clock::time_point start = boost::chrono::system_clock::now();
  69     boost::chrono::system_clock::time_point now = start;
  70
  71     for (int i = 0; i < 100; i++) {
  72         boost::chrono::system_clock::time_point t = now + boost::chrono::microseconds(randomMsec(rng));
  73         boost::chrono::system_clock::time_point tReschedule = now + boost::chrono::microseconds(500 + randomMsec(rng));
  74         int whichCounter = zeroToNine(rng);
  75         CScheduler::Function f = boost::bind(&microTask, boost::ref(microTasks),
  76                                              boost::ref(counterMutex[whichCounter]), boost::ref(counter[whichCounter]),
  77                                              randomDelta(rng), tReschedule);
  78         microTasks.schedule(f, t);
  79     }
  80
  81     MicroSleep(600);
  82     now = boost::chrono::system_clock::now();
  83     // More threads and more tasks:
  84     for (int i = 0; i < 5; i++)
  85         microThreads.create_thread(boost::bind(&CScheduler::serviceQueue, &microTasks));
  86     for (int i = 0; i < 100; i++) {
  87         boost::chrono::system_clock::time_point t = now + boost::chrono::microseconds(randomMsec(rng));
  88         boost::chrono::system_clock::time_point tReschedule = now + boost::chrono::microseconds(500 + randomMsec(rng));
  89         int whichCounter = zeroToNine(rng);
  90         CScheduler::Function f = boost::bind(&microTask, boost::ref(microTasks),
  91                                              boost::ref(counterMutex[whichCounter]), boost::ref(counter[whichCounter]),
  92                                              randomDelta(rng), tReschedule);
  93         microTasks.schedule(f, t);
  94     }
  95
  96     // All 2,000 tasks should be finished within 2 milliseconds. Sleep a bit longer.
  97     MicroSleep(2100);
  98
  99     microThreads.interrupt_all();
 100     microThreads.join_all();
 101
 102     int counterSum = 0;
 103     for (int i = 0; i < 10; i++) {
 104         BOOST_CHECK(counter[i] != 0);
 105         counterSum += counter[i];
 106     }
 107     BOOST_CHECK_EQUAL(counterSum, 200);
 108 }
 109
 110 BOOST_AUTO_TEST_SUITE_END()