Supervisord: Parallel child process spawning and monitoring

Supervisord is a simple and popular choice for process monitoring. Supervisord‘s primary purpose is to create and manage processes based on data in its configuration file. It does this by creating subprocesses. Each subprocess spawned by supervisor is managed for the entirety of its lifetime by supervisord. Continue reading

Multi-processing using shell script

I love concurrency. Writing a concurrent program is always complex. There are different technologies which are most suitable to do this job. In an earlier post I briefed how to achieve parallelization using PHP. Parallel processing can be done using shell script also; by spawning multiple child processes. It’s fairly simple to handle basic concurrent tasks in that manner.

A basic example to achieve the same-
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Multi-processing using PHP

There are situations when we need to make our one-process task into a multi-process task so that we can take advantage of the operating system’s multitasking capabilities.

The basic conceptual difference between multiprocessing and multithreading– A process, is a unique instance of a program with its own memory space, own process ID number etc. Whereas, a thread can be thought of as a virtual process, it does not have its own process ID, does not have its own memory space, but is still able to take advantage of multitasking.
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