I am trying to check how much memory is consumed by OS Kernel using below command, Is this the correct command that I'm using
According to this document this is not (quite) the correct command. To quote the linked explanation:
Quote:
Slab - The total amount of memory, in kilobytes, used by the kernel to cache data structures for its own use.
Note that "kernel" isn't a monolithic process. In fact the "kernel" consists of several processes, depending on how the system is configured, what it is doing, how much memory it has installed and perhaps a few other things. So it is difficult to point to one certain place and declare it to be the answer. The value you found is arguably part of the answer but if it is depends on what exactly the question is.
Can you tell us what exactly you want, so that maybe we can find some better solution?
I have many application running on LINUX box, RAM allocated on this box is 15GB
I want to know how much memory is consumed by Applications and OS
From application level only 12 GB RAM is allocated out of it only 8 GB RAM is consumed currently
But I'm unable to figure out how much RAM is consumed by OS on an average?
If I have a margin of how much RAM is consumed to OS then in future if I need to add any new software/app I can recommend for extra RAM in LINUX BOX, hope you understand
Moderator's Comments:
edit by bakunin: please use CODE-tags for data too, thank you.
I have many application running on LINUX box, RAM allocated on this box is 15GB
I want to know how much memory is consumed by Applications and OS
OK, now we're talking.
From the output you provided i read it like this:
You have 15G or RAM, of which ~14G are in (various) use, ~650M are unused. Of the 14G of used RAM ~2.5G are used for buffers and cache, leaving ~11.5G for kernel and applications. When you say ~8G are used for applications that would leave ~3.5G to the kernel. I don't know the Linux kernel well enough to say if the file cache is included in this figure or not.
You can check the memory footprint of running processes by using the -o vsz parameter to the ps-command (SystemV-version). i.e.
will show all processes with the allocated memory (virtual+physical, in KB) and the command lines to invoke them. You need to add the shared memory segments which you can find out about with the ipcs command:
to get the complete memory used by applications.
Refer to the man pages of the named commands for details.
Hi,
Below is the code snippet I use on Linux (Centos) to retrieve the Process Name, PID and memory consumed on Linux (Centos) host:-
top -b -n 1 | awk -v date="$tdydate" -v ip="$ip" 'NR>7 {print date","ip","$12,","$1,","$10}'
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Hi!!!
how can I obtain the consumed memory of a process?
nowadays i'm using ps -efo pid, pmem, comm,args ....
but the information is in percentage, is that correct?
so, i want to know how can obtain the consumed memory of a process in mb?
thanks in advance!
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hello
I am new to the UNIX I want to know what command is used
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