对于简单的shell命令执行,可以选择exec或execFile;对于需要实时处理输出的长时间运行命令,应该选择spawn;如果需要创建多个Node.js子进程并进行通信,则应该使用fork。
• 如果你要在子进程中运行 Node.js 逻辑(比如执行某段 JS 脚本、分担计算任务),并在父子进程之间经常通信,用fork。 简单来说: • spawn —— “我只是想在 Node.js 里调用操作系统命令,并且要拿到实时输出、输入。” • fork —— “我想启动另一个 Node.js 进程,既能并行执行 JS 逻辑,又能和主...
当你想要子进程返回大量数据给Node时,比如说图像处理,读取二进制数据等等,你最好使用spawn方法。 fork - child_process.fork 是 spawn()的特殊形式,用于在子进程中运行的模块,如 fork(‘./son.js’) 相当于 spawn(‘node’, [‘./son.js’]) 。与spawn方法不同的是,fork会在父进程与子进程之间,建立一个...
In the Node.js function above (an express.js controller function), we read an image file using a stream. Then, we use spawn method to spawnconvertprogram (see imagemagick.org). Then, we feed ChildProcess proc with the image stream. As long as the proc object produces data, we write th...
nodejs中 spawn 、fork、exec、execFile的区别 总结: 这四个都可以用来创建子进程 1.spawn和fork都是返回一个基于流的子进程对象 2.exec和execFile可以在回调中拿到返回的buffer的内容(执行成功或失败的输出) 3.exec是创建子shell去执行命令,用来直接执行shell命令 。execFile是去创建任意你指定的文件的进程...
3.exec是创建子shell去执行命令,用来直接执行shell命令 。execFile是去创建任意你指定的文件的进程 4.fork是一种特殊的spawn,可以理解为spawn增强版,返回的子进程对象可以和父进程对象进行通信,通过send和on方法。 https://dzone.com/articles/understanding-execfile-spawn-exec-and-fork-in-node...
constPAUSE='\x13';// XOFFconstRESUME='\x11';// XONconstptyProcess=pty.spawn(shell,[],{handleFlowControl:true});// flow control in actionptyProcess.write(PAUSE);// pty will block and pause the child program...ptyProcess.write(RESUME);// pty will enter flow mode and resume the child ...
When trying to run python code using the multiprocessing library, I get errors when it uses the default "spawn" start mode, and only runs properly in "fork" Steps to reproduce the issue: 1.import multiprocessing as mp def foo(q):
jse_cause: { [Error: spawn nonexistent ENOENT] code: 'ENOENT', errno: 'ENOENT', syscall: 'spawn nonexistent', path: 'nonexistent', cmd: 'nonexistent command' }, message: 'exec "nonexistent command": spawn nonexistent ENOENT' }, status: null, signal: null, stdout: '', stderr: '...
(eventually blocking waiting for work if none exist). This enables efficient processing when most tasks spawn other subtasks (as do most ForkJoinTasks), as well as when many small tasks are submitted to the pool from external clients. Especially when setting asyncMode to true in constructors...