multithreading

问题 I'm trying to make threaded flight software for a project in Python 3.4, in which I need threads to restart themselves in case an I/O error occurs during a sensor read or another fluke crash like that. Therefore I am working on making a watchdog to check if threads have died and restarting them. At first I attempted to just check if the thread was no longer alive and restart it, which did this: >>> if not a_thread.isAlive(): ... a_thread.start() Traceback (most recent call last): File "<stdin

问题 I'm reading for the answers and there are conflict ideas: In this link https://www.3dgep.com/cuda-thread-execution-model/, two warps (64 threads) can run concurrently on an SM (32 CUDA cores). So, I understand that the threads on a warp are splited and be processed on 16 CUDA cores. This idea makes sense for me because each CUDA core has 1 32bitALU. However, in other links, they claimed that 1 CUDA core is able to handle 32 concurrent threads (same as a warp size) (https://cvw.cac.cornell.edu

问题 When I added JComboBox, JRadioButton, JButton to JPanel, it was working fine, but after I added them to JFrame instead and executed it, all these components were gone. My code is listed below: import java.awt.*; import java.awt.event.*; import javax.swing.*; public class Test21 { public static void main(String[] args) { JFrame jf = new JFrame("康樂彩歌(v0)"); jf.setBounds(0, 0, 1368, 730); jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); JLabel label1 = new JLabel("選歌："); //創建標簽 label1.setFont

问题 I'm working on a script that has several functions that take time to execute on different remote computers. Is there any way I could Invoke-Command them in the same time in a parallel way? An example would be appreciated. Thanks 回答1: Invoke-Command already executes calls against each computer in parallel, as part of built-in functionality: One-to-Many Remoting The real power of remoting is the ability to send a command, in parallel, to one or more remote computers. Each remote computer

问题 I need to log data from sensor as fast as possible. Therefore I start a process for continuously writing data to MySQL database by a parallel running thread in python. After I started this thread, I need to frequently fetch some data of the database, which have been inserted of the active thread. The issue is, that I can´t get acces to the data while the thread is running . after I stop the thread, I can read the data out of the database. I also tried to "commit" the writing every on every

问题 I have two videos here showing the rendering of a decoded MJPEG video sequence this one only rending one video: Video description: Left (Source), Middle (Canvas copy of stream), Right (Decoded from network). At this point the video is smooth both from source to network and back (websocket). And at least up to 5 video decoded and rendered is reasonably smooth. However if I render like 20 videos things start to lag: My question is what is the best algorithm that will allow to render (or in

问题 I am using scala Iterator for waiting loop in synchronized block: anObject.synchronized { if (Try(anObject.foo()).isFailure) { Iterator.continually { anObject.wait() Try(anObject.foo()) }.dropWhile(_.isFailure).next() } anObject.notifyAll() } Is it acceptable to use Iterator with concurrency and multithreading? If not, why? And then what to use and how? There are some details, if it matters. anObject is a mutable queue. And there are multiple producers and consumers to the queue. So the block

问题 Redis 3.0.5 Spring Data Redis 1.3.6 jedis 2.6.3 - Our is web application which receives data from redis over pub/sub. - Also performs read/write of data on redis as key/value pairs. - read/write happens on listener thread, independent monitoring thread and http request threads. - We have used a same connection factory for Listener and redis template - Our redis server has "timeout=30" configured <bean id="jedisConnectionFactory" class="org.springframework.data.redis.connection.jedis

问题 Following is the code causing this. if :: ((fromProc[0] == MSG_SLEEP) && nempty(proc2clk[0])) -> proc2clk[0] ? fromProc[0]; // Woke up :: (!(fromProc[0] == MSG_SLEEP) && !(fromProc[0] == MSG_FIN)) -> clk2proc[0] ! 0; ::else -> time = time + 1; // just for debugging fi; If I remove the nempty call in the first condition, the error is gone. From what I've read, you can not use the else statement, if you use a receive or send statement in a condition, but from what I know, nempty is not a

问题 I have a python tool, that has basically this kind of setup: main process (P1) -> spawns a process (P2) that starts a tcp connection -> spawns a thread (T1) that starts a loop to receive messages that are sent from P2 to P1 via a Queue (Q1) server process (P2) -> spawns two threads (T2 and T3) that start loops to receive messages that are sent from P1 to P2 via Queues (Q2 and Q3) The problem I'm having is that when I stop my program (with Ctrl+C), it doesn't quit. The server process is ended,