threadpool

问题 As windows user, I know that OS threads consume ~1 Mb of memory due to By default, Windows allocates 1 MB of memory for each thread’s user-mode stack. How does golang use ~8kb of memory for each goroutine , if OS thread is much more gluttonous. Are goroutine sort of virtual threads? 回答1: Goroutines are not threads, they are (from the spec): ...an independent concurrent thread of control, or goroutine , within the same address space. Effective Go defines them as: They're called goroutines

问题 I've created a pool of 4 worker threads to process some files. In the test there's about 200 of them. The thread pool version is already about 3 times faster than doing it sequentially but there is room for improvement. The biggest bottleneck (ignoring disk I/O) is that I need to instantiate a new MessageDigest object. In the single threaded version I just had 1. In this version I have 200. What I was wondering was, is it possible to have a variable local to the thread in the work pool? That

问题 I've created a pool of 4 worker threads to process some files. In the test there's about 200 of them. The thread pool version is already about 3 times faster than doing it sequentially but there is room for improvement. The biggest bottleneck (ignoring disk I/O) is that I need to instantiate a new MessageDigest object. In the single threaded version I just had 1. In this version I have 200. What I was wondering was, is it possible to have a variable local to the thread in the work pool? That

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 6 years ago . I want to learn to write a thread pool in Java Can anyone point me to useful resources ? 回答1: You could have a look at the source code for ThreadPoolExecutor from core java. Though why do you want to reinvent the wheel? 回答2: take a look at Doug Lea's books... they are fairly old now (unless he released a new one

问题 I've read (and used) async/await quite a lot for some time now but I still have one question I can't get an answer to. Say I have this code. private async void workAsyncBtn_Click(object sender, EventArgs e) { var myTask = _asyncAwaitExcamples.DoHeavyWorkAsync(5); await myTask; statusTextBox.Text += "\r\n DoHeavyWorkAsync message"; } It's called from the UI thread and returned to the UI Thread. Therefor I am able to do UI-specific things in this method and after the await myTask . If I had

问题 The Microsoft .NET Base Class Library provides several ways to create a thread and start it. Basically the invocation is very similar to every other one providing the same kind of service: create an object representing an execution flow (or more), assign it a delegate representing the execution flow to execute and, eventually, depending on delegate signature, an object as a parameter. Well, there are two approaches (essentially): 1) Using the System.Threading.Thread class. Thread curr = new

问题 The Microsoft .NET Base Class Library provides several ways to create a thread and start it. Basically the invocation is very similar to every other one providing the same kind of service: create an object representing an execution flow (or more), assign it a delegate representing the execution flow to execute and, eventually, depending on delegate signature, an object as a parameter. Well, there are two approaches (essentially): 1) Using the System.Threading.Thread class. Thread curr = new

问题 The Microsoft .NET Base Class Library provides several ways to create a thread and start it. Basically the invocation is very similar to every other one providing the same kind of service: create an object representing an execution flow (or more), assign it a delegate representing the execution flow to execute and, eventually, depending on delegate signature, an object as a parameter. Well, there are two approaches (essentially): 1) Using the System.Threading.Thread class. Thread curr = new

问题 I'm using RHEL 6 64-bit and run on Virtual Machine on quad-core processors. I wrote the following program to examine the number of threads the hardware can handle. #include <thread> #include <iostream> using namespace std; int main() { cout << thread::hardware_concurrency() << endl; return 0; } The result is always zero, what is the reason of such result? 回答1: from cppreference: Returns the number of concurrent threads supported by the implementation. The value should be considered only a

问题 In the following java application, I use TwitterStream to gather tweets using sample function. I need to start and stop the stream whenever user wants, but I get the following exception: java.util.concurrent.RejectedExecutionException: Task twitter4j.StatusStreamBase$1@74e75335 rejected from java.util.concurrent.ThreadPoolExecutor@5117b235[Terminated, pool size = 0, active threads = 0, queued tasks = 0, completed tasks = 2] at java.util.concurrent.ThreadPoolExecutor$AbortPolicy