topic Re: get SWAP Space in Operating System - Linux

get SWAP Space

Tonatiuh — Mon, 16 May 2005 11:33:43 GMT

Red Hat Enterprise Linux 3.0

How can I get the swap space of my system?

Thanks!

Re: get SWAP Space

Tonatiuh — Mon, 16 May 2005 13:08:02 GMT

I mean, how can I know the swap space of my server?

Re: get SWAP Space

HGN — Mon, 16 May 2005 15:05:29 GMT

Hi

You can use the command free to check the swap
To create swap you need to mkswap and to activate it you need to use swapon.

Rgds

HGN

Re: get SWAP Space

Alex Lavrov. — Mon, 16 May 2005 15:12:52 GMT

Also you can see how many memory is swapped from/in disk with "vmstat".

Re: get SWAP Space

Tonatiuh — Mon, 16 May 2005 15:27:56 GMT

I am really newbie. Can you write the syntax of this commands to get the info requiered?

Re: get SWAP Space

Alex Lavrov. — Mon, 16 May 2005 15:33:11 GMT

It's just free ...

You can do "free -m" to view the amounts in megabytes, at the bottom you'll see the swapsize.

Also, you can look into /proc/meminfo, there at the bottom, you'll see the swap size too.

Re: get SWAP Space

Stuart Browne — Mon, 16 May 2005 20:59:44 GMT

If you just want to 'see' how much is available, you can use the 'top' command to get running info.

If you wan't to script it in the future, it's easiest to grab it directly from '/proc/meminfo', using something like 'grep ^Swap: /proc/meminfo'. These are the same numbers as shown in the 'top' output. It shows the number of 'bytes' allocated as swap, how many are in use, as well as how many are currently free.

To get a running idea of how swap is being used, you can use something like 'vmstat -ban 1', which takes a sample every second, and shows swap-in, and swap-out (si/so).

If you want general overview over a longer period of time, install the 'sysstat' RPM and use 'sar -r' (and it's variants).

Re: get SWAP Space

Gopi Sekar — Tue, 17 May 2005 01:15:19 GMT

if you want to know available and used swap and RAM memory information run, free -m

it will give information in Megabytes. if you want to continuously watch for system memory, cpu and process related information then use top command.

Regards,
Gopi

Re: get SWAP Space

Ross Minkov — Tue, 17 May 2005 08:51:49 GMT

/usr/bin/free | /bin/grep Swap: | /bin/awk '{printf "Swap: %5d MB\n",$2/1024}'

Re: get SWAP Space

Mike Jagdis — Sun, 22 May 2005 12:13:33 GMT

And finally...

If you want it by swap partition/file rather than all totalled up:

cat /proc/swaps

Mike