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if a process state is currently showing as uninterruptible sleep, which letter will show in the output of the ps command?

Sagot :

On processes in an uninterruptible sleep state, the ps command displays a "D". The current processes that are "blocked" or waiting on I/O are also displayed by the vmstat command.

State "D" (uninterruptible sleep) denotes that the process is attempting to execute IO while operating in kernel space (in a system call). These processes cannot be debugged with gdb or pstack and do not respond to signals (like SIGKILL). Use the ps command, please. It offers details on the active processes, including their PIDs (PIDs). The ps command can display details about every process that is currently running on both Linux and UNIX systems. The ps command provides an overview of the active processes.

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