如果性能测试太慢，如何进行性能测试?

I'd like my test to fail if it runs slower than 0.5 seconds but the average time is merely printed in the console and I cannot find a way to access it. Is there a way to access this data?

我希望我的测试失败，如果它运行速度低于0.5秒，但平均时间只是打印在控制台，我无法找到访问它的方法。有办法访问这些数据吗?

Code

代码

//Measures the time it takes to parse the participant codes from the first 100 events in our test data.
func testParticipantCodeParsingPerformance()
{
    var increment = 0
    self.measureBlock
    {
        increment = 0
        while increment < 100
        {
            Parser.parseParticipantCode(self.fields[increment], hostCodes: MasterCalendarArray.getHostCodeArray()[increment])
            increment++
        }
    }
    print("Events measured: \(increment)")
}

Test Data

测试数据

[Tests.ParserTest testParticipantCodeParsingPerformance]' measured [Time, seconds] average: 0.203, relative standard deviation: 19.951%, values: [0.186405, 0.182292, 0.179966, 0.177797, 0.175820, 0.205763, 0.315636, 0.223014, 0.200362, 0.178165]

(测试。实验测量[时间，秒]平均值:0.203，相对标准偏差:19.951%，值:[0.186405,0.182292,0.179966,0.177797,0.175820,0.205763,0.315636,0.223014,0.178165]

2 个解决方案

#1

You need to set a baseline for your performance test. Head to the Report Navigator:

您需要为性能测试设置一个基线。报告导航:

and select your recent test run. You'll see a list of all your tests, but the performance ones will have times associated with them. Click the time to bring up the Performance Result popover:

选择最近的测试运行。您将看到所有测试的列表，但是性能测试将有与它们相关的时间。点击时间，弹出性能结果:

The "Baseline" value is what you're looking for--set it to 0.5s and that will inform Xcode that this test should complete in half a second. If your test is more than 10% slower than the baseline, it'll fail!

“基线”值是您正在寻找的——将其设置为0.5，并将通知Xcode，这个测试应该在半秒内完成。如果您的测试比基线慢10%以上，它将失败!

#2

The only way to do something similar to what you describe is setting a time limit graphically like @andyvn22 recommends.

要做与您描述的类似的事情，惟一的方法是按@andyvn22建议的图形化方式设置时间限制。

But, if you want to do it completely in code, the only thing you can do is extend XCTestCase with a new method that measure the execution time of the closure and returns it to be used in an assertiong, here is an example of what you could do:

但是，如果你想在代码中完全实现它，你唯一能做的就是用一个新方法扩展XCTestCase，这个新方法可以测量闭包的执行时间并返回给assertiong，这里有一个例子可以说明你能做什么:

extension XCTestCase{
    /// Executes the block and return the execution time in millis
    public func timeBlock(closure: ()->()) -> Int{
        var info = mach_timebase_info(numer: 0, denom: 0)
        mach_timebase_info(&info)
        let begin = mach_absolute_time()

        closure()

        let diff = Double(mach_absolute_time() - begin) * Double(info.numer) / Double(1_000_000 * info.denom)
        return Int(diff)
    }
}

And use it with:

并使用它:

func testExample() {
    XCTAssertTrue( 500 < self.timeBlock{
        doSomethingLong()
    })
}

#1