How do I check amount of RAM in my Ubuntu Linux laptop or desktop system/server using GUI and command line tools?
There are various commands on Ubuntu Linux that can show you total RAM, used and free ram as follows:
- free command
- top command
- vmstat command
- /proc/meminfo file.
Display available memory on Ubuntu Linux
Open a command-line terminal (select Applications > Accessories > Terminal), and then type the following commands to view amount of free and used memory in the system including total ram:
total used free shared buffers cached Mem: 7997 2618 5378 0 126 1353 -/+ buffers/cache: 1139 6858 Swap: 15623 0 15623
You can also use the following command to get same info:
grep MemTotal /proc/meminfo
MemTotal: 8189496 kB
The above output indicates that I’ve total 8GiB ram. You can get detailed info by typing the following cat command:
$ cat /proc/meminfo
MemTotal: 2050424 kB MemFree: 649088 kB Buffers: 304844 kB Cached: 920136 kB SwapCached: 4 kB Active: 803628 kB Inactive: 431560 kB Active(anon): 3988 kB Inactive(anon): 8628 kB Active(file): 799640 kB Inactive(file): 422932 kB Unevictable: 2944 kB Mlocked: 2944 kB SwapTotal: 3998716 kB SwapFree: 3998712 kB Dirty: 20 kB Writeback: 0 kB AnonPages: 13296 kB Mapped: 10364 kB Shmem: 336 kB Slab: 118192 kB SReclaimable: 101820 kB SUnreclaim: 16372 kB KernelStack: 1240 kB PageTables: 1740 kB NFS_Unstable: 0 kB Bounce: 0 kB WritebackTmp: 0 kB CommitLimit: 5023928 kB Committed_AS: 67748 kB VmallocTotal: 34359738367 kB VmallocUsed: 30748 kB VmallocChunk: 34359698708 kB HardwareCorrupted: 0 kB AnonHugePages: 0 kB HugePages_Total: 0 HugePages_Free: 0 HugePages_Rsvd: 0 HugePages_Surp: 0 Hugepagesize: 2048 kB DirectMap4k: 52096 kB DirectMap2M: 2043904 kB
You can use other commands to get the same info:
### you need to install htop ##
This tutorial is also available in a quick video format:
GUI Tool To Find Out RAM Size Under Ubuntu Linux
The System Monitor application enables you to display basic system information and monitor system processes, usage of system resources, and file systems. You can also use System Monitor to modify the behavior of your system. To see memory information graphically, click on System > Administration > System monitor:
A note about 3GB ram problem
If your Linux based system only shows 3 GB ram (it may be in the 2.9â€“3.5 GB range) even if you got more than 3GB installed. You can get around this barrier running on x86 microprocessors by following this tutorial. The barrier can be resolved by moving to a 64-bit processor and operating system. On certain x86 hardware, it is possible to resolve it by using physical address extension (PAE) mode on x86.