1、变量定义 ThreadPoolExecutor中有一个重要的变量ctl,定义如下: 图1 看注释可以知道,这个变量有两个作用: 1、记录有效的线程数量,即 workerCount 2、记录当线程池的状态,即 runState 2、原理分析 这个变量是如何同时记录这两个值的呢?答案是:位运算。下面详细说明一下 首先说线程池的状态,根据代码可以知道,线...
首先,你需要确认threadpoolctl模块是否已经正确安装在你的Python环境中。可以通过在命令行中运行以下命令来检查: bash pip show threadpoolctl 如果threadpoolctl已安装,这个命令会显示该模块的详细信息。如果命令没有返回任何信息,说明threadpoolctl可能尚未安装。 如果未安装,使用pip安装'threadpoolctl'模块: 如果确认...
所以,工作线程数量最大不能超过 2^29-1 ,ThreadPoolExecutor 的设计者也是考虑不太可能超过这个数,暂时就用了29位。 ctl 变量的位分布 了解了 ctl 变量的结构,再回过头来看前面提到的两个方法。 privatestaticintworkerCountOf(intc){returnc&CAPACITY;}privatestaticbooleanisRunning(intc){returnc<SHUTDOWN;} work...
publicvoidexecute(Runnable command){//#1if(command ==null)thrownewNullPointerException();intc = ctl.get();if(workerCountOf(c) < corePoolSize) {//#2if(addWorker(command,true))return;c = ctl.get();}if(isRunning(c) && workQueue.offer(command)) {//#3intrecheck = ctl.get();if(! is...
我们把ThreadPoolExecutor中的状态和状态相关的方法复制出来,然后创建一个线程池,在运行中的时候分析线程池的状态和线程数,于是有了下面例子: @Slf4j public class ThreadPoolExecutorCtlAnalysis { private static final int COUNT_BITS = Integer.SIZE - 3; ...
The changelog is available here:https://github.com/joblib/threadpoolctl/blob/master/CHANGES.md. This version supports Python versions 3.8 to 3.12. You can install with pip: pip install -U threadpoolctl or conda: conda install -c conda-forge threadpoolctl...
Using threadpoolctl may crash your program in such a setting. Fortunately this problem is very rare: at the time of writing, all major binary distributions of Python packages for Linux use either GCC or ICC to build the Python scientific packages. Therefore this problem would only happen if ...
I do not think there has been a common standard to specify this information. In other libraries, I have seen dependencies insetup.cfg,setup.py,pyproject.toml, andrequirements.txt(which is dynamically loaded intosetup.py). That being said, I am in favor of moving d...
peekThreadPoolExecuteState(executor, ctlField);// 休眠2秒钟,看看线程池最终的状态Thread.sleep(2000); peekThreadPoolExecuteState(executor, ctlField); } } 在看运行结果之前,我们先看下ThreadPoolExecutor中的几处涉及到状态变更的方法实现。 submit()源码分析 ...
1 ctl: ctl维护两个概念上的参数:workCount和runState(线程池的状态)。为了将状态和数量放在一起,所以高3位用于表示表示状态,低29位表示数量。 2 状态值 COUNT_BITS = Integer.SIZE - 3; // = 29 CAPACITY = (1 << COUNT_BITS) - 1; // = 0001 1111 1111 1111 1111 ... 1111 ...