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Defunct processes (also called zombie processes) are processes which were not cleaned up by their parent, and the parent process has died. They cannot be killed without a reboot. I don't worry too much about them.<br />

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Defunct processes (also called zombie processes) are processes which were not cleaned up by their parent, and the parent process has died. They cannot be killed without a reboot. I don't worry too much about them.


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What are Defunc processes and how it affects the performance of the system ? And how to find them ? 
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What are Defunc processes and how it affects the performance of the system ? And how to find them ? 

Defunc processes

Operating systems perform basic tasks, such as recognizing input from the keyboard, sending output to the display screen, keeping track of files and directories on the disk, and controlling peripheral devices such as disk drives and printers. For large systems, the operating system makes sure that different programs and users running at the same time do not interfere with each other. The operating system is also responsible for security, ensuring that unauthorized users do not access the system. Operating systems provide a software platform on top of which other programs, called application programs, can run.