si: Amount of virtual memory swapped in from swap space.cache: the amount of memory used as cache.buff: the amount of memory used as buffers.free: the amount of idle (currently unused) memory.In other words, how much memory has been swapped out., swpd: the amount of virtual memory used.Typically the process is a device driver waiting for some resource to come free. Any queued interrupts for that process are handled when the process resumes its usual activity.
The process isn’t sleeping, it is performing a blocking system call, and it cannot be interrupted until it has completed its current action. b: The number of processes in uninterruptible sleep.These are processes that have been launched and are either running or are waiting for their next time-sliced burst of CPU cycles.
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