05-21-2017
There is no command that gives the “actual memory usage of a process” because there is no such thing as the actual memory usage of a process.
Each memory page of a process could be (among other distinctions):
1.Transient storage used by that process alone.
2.Shared with other processes using a variety of mechanisms.
3.Backed up by a disk file.
4.In physical memory or swap.
I think the “dirty” figure adds up everything that is in RAM (not swap) and not backed by a file. This includes both shared and non-shared memory (though in most cases other than forking servers, shared memory consists of memory-mapped files only).
The information displayed by pmap comes from /proc/PID/maps and /proc/PID/smaps. That is the real memory usage of the process — it can't be summarized by a single number.
Christian
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Last edited by ChristianC123; 05-24-2017 at 04:19 PM..
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IPCS(1) BSD General Commands Manual IPCS(1)
NAME
ipcs -- report System V interprocess communication facilities status
SYNOPSIS
ipcs [-abcMmopQqSsTt]
DESCRIPTION
The ipcs utility provides information on System V interprocess communication (IPC) facilities on the system.
The options are as follows:
-a Show the maximum amount of information possible when displaying active semaphores, message queues, and shared memory segments. (This
is shorthand for specifying the -b, -c, -o, -p, and -t options.)
-b Show the maximum allowed sizes for active semaphores, message queues, and shared memory segments. The ``maximum allowed size'' is
the maximum number of bytes in a message on a message queue, the size of a shared memory segment, or the number of semaphores in a
set of semaphores.
-c Show the creator's name and group for active semaphores, message queues, and shared memory segments.
-M Display system information about shared memory.
-m Display information about active shared memory segments.
-o Show outstanding usage for active message queues, and shared memory segments. The ``outstanding usage'' is the number of messages in
a message queue, or the number of processes attached to a shared memory segment.
-p Show the process ID information for active semaphores, message queues, and shared memory segments. The ``process ID information'' is
the last process to send a message to or receive a message from a message queue, the process that created a semaphore, or the last
process to attach or detach a shared memory segment.
-Q Display system information about messages queues.
-q Display information about active message queues.
-S Display system information about semaphores.
-s Display information about active semaphores.
-T Display system information about shared memory, message queues and semaphores.
-t Show access times for active semaphores, message queues, and shared memory segments. The access times is the time of the last con-
trol operation on an IPC object, the last send or receive of a message, the last attach or detach of a shared memory segment, or the
last operation on a semaphore.
If none of the -M, -m, -Q, -q, -S, or -s options are specified, information about all active IPC facilities is listed.
RESTRICTIONS
System data structures may change while ipcs is running; the output of ipcs is not guaranteed to be consistent.
BUGS
This manual page is woefully incomplete, because it does not at all attempt to explain the information printed by ipcs.
SEE ALSO
ipcrm(1)
AUTHORS
Thorsten Lockert <tholo@sigmasoft.com>
BSD
June 18, 1994 BSD