multithreading

问题 I'm trying to transfer samples from thread A ("Acquisition") to thread B ("P300") using queue but I can't read any data in thread B, although samples are being allocated in thread A. Judging by my output, I think my thread B is rushing and testing things before my thread A starts to put data in. See an approximation of my code structure bellow: import threading import queue from queue import Empty import numpy as np import warnings warnings.filterwarnings("error") class AcqThread(threading

问题 I have a multi-threaded Step configured with a threadpool with a corePoolSize of 48 threads (it's a big machine) but I did not configure the throttle-limit . I am wondering if I have been under utilizaing the machine because of this. The Spring Batch documentation says that throttle-limit is the max amount of concurrent tasks that can run at one time and the default is 4 . I can see in jconsole that in fact there are 48 threads created and they seem to be executing (I can also see that in my

问题 I have a website and I am also exploring Parallel Processing in C# and I thought it would be a good idea to see if I could write my own DDOS test script to see how the site would handle a DDOS attack. However when I run it, there only seems to be 13 threads in use and they always return 200 status codes, never anything to suggest the response wasn't quick and accurate and when going to the site and refreshing at the same time as the script runs the site loads quickly. I know there are tools

问题 I have a website and I am also exploring Parallel Processing in C# and I thought it would be a good idea to see if I could write my own DDOS test script to see how the site would handle a DDOS attack. However when I run it, there only seems to be 13 threads in use and they always return 200 status codes, never anything to suggest the response wasn't quick and accurate and when going to the site and refreshing at the same time as the script runs the site loads quickly. I know there are tools

问题 I have a website and I am also exploring Parallel Processing in C# and I thought it would be a good idea to see if I could write my own DDOS test script to see how the site would handle a DDOS attack. However when I run it, there only seems to be 13 threads in use and they always return 200 status codes, never anything to suggest the response wasn't quick and accurate and when going to the site and refreshing at the same time as the script runs the site loads quickly. I know there are tools

问题 I have a website and I am also exploring Parallel Processing in C# and I thought it would be a good idea to see if I could write my own DDOS test script to see how the site would handle a DDOS attack. However when I run it, there only seems to be 13 threads in use and they always return 200 status codes, never anything to suggest the response wasn't quick and accurate and when going to the site and refreshing at the same time as the script runs the site loads quickly. I know there are tools

问题 I have a website and I am also exploring Parallel Processing in C# and I thought it would be a good idea to see if I could write my own DDOS test script to see how the site would handle a DDOS attack. However when I run it, there only seems to be 13 threads in use and they always return 200 status codes, never anything to suggest the response wasn't quick and accurate and when going to the site and refreshing at the same time as the script runs the site loads quickly. I know there are tools

问题 I'm reading this link to learn about futex of Linux. Here is something that I don't understand. In order to acquire the lock, an atomic test-and-set instruction (such as cmpxchg()) can be used to test for 0 and set to 1. In this case, the locking thread acquires the lock without involving the kernel (and the kernel has no knowledge that this futex exists). When the next thread attempts to acquire the lock, the test for zero will fail and the kernel needs to be involved. I don't quite

问题 I'm reading this link to learn about futex of Linux. Here is something that I don't understand. In order to acquire the lock, an atomic test-and-set instruction (such as cmpxchg()) can be used to test for 0 and set to 1. In this case, the locking thread acquires the lock without involving the kernel (and the kernel has no knowledge that this futex exists). When the next thread attempts to acquire the lock, the test for zero will fail and the kernel needs to be involved. I don't quite

问题 I'm reading this link to learn about futex of Linux. Here is something that I don't understand. In order to acquire the lock, an atomic test-and-set instruction (such as cmpxchg()) can be used to test for 0 and set to 1. In this case, the locking thread acquires the lock without involving the kernel (and the kernel has no knowledge that this futex exists). When the next thread attempts to acquire the lock, the test for zero will fail and the kernel needs to be involved. I don't quite