ants

【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 定义 自旋锁是计算机科学用于多线程同步的一种锁，线程反复检查锁变量是否可用。由于线程保持活动状态，但未执行其他的任务，因此是一种 繁忙等待(Busy waiting) 。一旦获取了自旋锁，线程会一直保持该锁，直至显式释放自旋锁。它避免了进程重新调度或上下文的切换带来的开销，因此对于线程只会阻塞很短时间的场合是有效的。 go源码 package internal import ( "runtime" "sync" "sync/atomic" ) type spinLock uint32 func (sl *spinLock) Lock() { for !atomic.CompareAndSwapUint32((*uint32)(sl), 0, 1) { //判断是否能获得锁 runtime.Gosched() //出让cpu } } func (sl *spinLock) Unlock() { atomic.StoreUint32((*uint32)(sl), 0) } // NewSpinLock 实例化自旋锁 func NewSpinLock() sync.Locker { return new(spinLock) } //代码来源 github.com/panjf2000/ants runtime

I start to evaluate Red Gate's ANTS Profiler to profile my WPF application. I read through the online support/documentation and can't seem to find explanation for the basics (and I don't know why they are not in the documentation): In the profiler, it shows Time and Hit Count of Method. Why is Time has unit of % ? Shouldn't it be second? I try to add up all the percentage but they don't add up to 100. The Time with Children has also unit in % , which adds up more than 100%. I cannot tell whether they are time or portion of something. What is Hit Count? What is "hitting" my application and what

I've got a serious head-scratcher on my hands here. I'm investigating performance issues with a WPF component in our application. Our .net application is very large, and almost entirely in windows forms. As part of a new initiative we rewrote one of our core components with a rich WPF ui. There is a lot of WinForms<-->WPF interop going on with this thing to glue it together, and I suspect that may be somehow related to what I'm seeing. When I profile the slow operation in ANTS profiler, I see a lot of activity occurring inside the function UnsafeNativeMethods.IntGetMessageW. ANTS reports as

I recently started using the ANTS profiling tools for production work. Aside from being amazed by their awesomeness, I couldn't help but wonder how they work. For example, one of the most useful features lets you visualize the global roots of a running program complete with the number of references to values of different types. How does this tool get hold of that information? Chris Schmich (Full disclosure: I'm on the Visual Studio Profiler team, but the below information is public) You can do this by writing a CLR profiler that runs inside the process you're targeting. CLR profilers are C++