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/*
* Copyright (C) 2016 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
// On Mac, you can build this like so:
// xcrun clang++ -o LockFairnessTest Source/WTF/benchmarks/LockFairnessTest.cpp -O3 -W -ISource/WTF -ISource/WTF/benchmarks -LWebKitBuild/Release -lWTF -framework Foundation -licucore -std=c++11 -fvisibility=hidden
#include "config.h"
#include "ToyLocks.h"
#include <thread>
#include <unistd.h>
#include <wtf/CommaPrinter.h>
#include <wtf/CurrentTime.h>
#include <wtf/DataLog.h>
#include <wtf/HashMap.h>
#include <wtf/Lock.h>
#include <wtf/ParkingLot.h>
#include <wtf/StdLibExtras.h>
#include <wtf/Threading.h>
#include <wtf/ThreadingPrimitives.h>
#include <wtf/Vector.h>
#include <wtf/WordLock.h>
#include <wtf/text/CString.h>
namespace {
NO_RETURN void usage()
{
printf("Usage: LockFairnessTest yieldspinlock|pausespinlock|wordlock|lock|barginglock|bargingwordlock|thunderlock|thunderwordlock|cascadelock|cascadewordlockhandofflock|mutex|all <num threads> <seconds per test> <microseconds in critical section>\n");
exit(1);
}
unsigned numThreads;
double secondsPerTest;
unsigned microsecondsInCriticalSection;
struct Benchmark {
template<typename LockType>
static void run(const char* name)
{
LockType lock;
std::unique_ptr<unsigned[]> counts = std::make_unique<unsigned[]>(numThreads);
std::unique_ptr<ThreadIdentifier[]> threads = std::make_unique<ThreadIdentifier[]>(numThreads);
volatile bool keepGoing = true;
lock.lock();
for (unsigned threadIndex = numThreads; threadIndex--;) {
counts[threadIndex] = 0;
threads[threadIndex] = createThread(
"Benchmark Thread",
[&, threadIndex] () {
if (!microsecondsInCriticalSection) {
while (keepGoing) {
lock.lock();
counts[threadIndex]++;
lock.unlock();
}
return;
}
while (keepGoing) {
lock.lock();
counts[threadIndex]++;
usleep(microsecondsInCriticalSection);
lock.unlock();
}
});
}
sleepMS(100);
lock.unlock();
sleep(secondsPerTest);
keepGoing = false;
lock.lock();
dataLog(name, ": ");
CommaPrinter comma;
for (unsigned threadIndex = numThreads; threadIndex--;)
dataLog(comma, counts[threadIndex]);
dataLog("\n");
lock.unlock();
for (unsigned threadIndex = numThreads; threadIndex--;)
waitForThreadCompletion(threads[threadIndex]);
}
};
} // anonymous namespace
int main(int argc, char** argv)
{
WTF::initializeThreading();
if (argc != 5
|| sscanf(argv[2], "%u", &numThreads) != 1
|| sscanf(argv[3], "%lf", &secondsPerTest) != 1
|| sscanf(argv[4], "%u", µsecondsInCriticalSection) != 1)
usage();
runEverything<Benchmark>(argv[1]);
return 0;
}
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