Objective-C dispatch Queue Speed Tests

lockSpeedTests.m

- (void)testQueue {
    dispatch_queue_t lockQueue = dispatch_queue_create("com.test.LockQueue", DISPATCH_QUEUE_SERIAL);
    [self executeLockTest:^(VoidBlock block) {
        dispatch_sync(lockQueue, ^{
            block();
        });
    }];
}

- (void)disabled_testNoLock {

}

- (void)executeLockTest:(PerformBlock)performBlock {
    NSInteger dispatchBlockCount = 16;
    NSInteger iterationCountPerBlock = 100000;
    // This is an example of a performance test case.
    NSArray *queues = @[
                       dispatch_get_global_queue(QOS_CLASS_USER_INTERACTIVE, 0),
                       dispatch_get_global_queue(QOS_CLASS_DEFAULT, 0),
                       dispatch_get_global_queue(QOS_CLASS_UTILITY, 0)
                       ];
    __block NSInteger value = 0;
    [self measureBlock:^{
        dispatch_group_t group = dispatch_group_create();
        for(NSInteger block = 0; block < dispatchBlockCount; block++) {
            dispatch_group_enter(group);
            dispatch_queue_t queue = queues[block % queues.count];
            dispatch_async(queue, ^{
                for (NSInteger i = 0; i < iterationCountPerBlock; i++) {
                    performBlock(^(){
                        value = value + 2;
                        value = value - 1;
                    });
                }
            });
        }
    }];
    
    //iphone 7
    //Objc
    //'-[Test_Lock testQueue]' measured [Time, seconds] average: 0.000, relative standard deviation: 55.664%, values: [0.000048, 0.000015, 0.000014, 0.000013, 0.000024, 0.000013, 0.000018, 0.000014, 0.000014, 0.000013], performanceMetricID:com.apple.XCTPerformanceMetric_WallClockTime, baselineName: "", baselineAverage: , maxPercentRegression: 10.000%, maxPercentRelativeStandardDeviation: 10.000%, maxRegression: 0.100, maxStandardDeviation: 0.100
    
    //Swift (copied from: https://gist.github.com/steipete/36350a8a60693d440954b95ea6cbbafc)
    //'-[Test_Lock_Speeds___SwiftTests.LockingTests testQueue]' measured [Time, seconds] average: 10.021, relative standard deviation: 9.422%, values: [10.429436, 11.166589, 10.586414, 10.119401, 8.534352, 8.205011, 10.162314, 11.007594, 10.547610, 9.448894], performanceMetricID:com.apple.XCTPerformanceMetric_WallClockTime, baselineName: "", baselineAverage: , maxPercentRegression: 10.000%, maxPercentRelativeStandardDeviation: 10.000%, maxRegression: 0.100, maxStandardDeviation: 0.100