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- Linux Check Memory Size
- Check Free Memory Slots Linux
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- Linux Check Memory Slots Disk
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Here’s a useful way of finding out how many memory slots are occupied on the motherboard of a machine without removing the cover, as well as how much installed physical memory is supported.
Browse other questions tagged linux memory hardware ram or ask your own question. The Overflow Blog How to write an effective developer resume: Advice from a hiring manager.
- Memconf is a simple perl script that displays memory modules installed in a Linux, Unix, Sun/Oracle Solaris, and HP-UX system. Make sure you have installed perl before using this script. To install perl on Arch Linux and its derivatives, run.
- If you need to improve memory management on your system, you should definitely check tutorials related to swap as they elaborate more about the importance of virtual memory on your system. If you are interested in Linux system administration, make sure to have a look at other tutorials that we have on the subject.
We can use the dmidecode command to reveal your systems DMI table, which contains details of the systems hardware.
There are a whole load of DMI types we can look at – a full table of those at the end of this article.
In this particular case, we are interested in memory – type 16 ‘Physical Memory Array’ will show us how much memory is supported and DMI type 17 will reveal details of currently installed memory.
So, first off:-
dmidecode -t 16
Maximum Capacity shows us the maximum amount of memory can be installed in the machine. Number of devices tells us how many slots there are on the motherboard – in this case, 8.
Now we can interrogotate DMI type 17 – ‘Memory Device’ to show us details of installed memory
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dmidecode -t 17
Each module installed will be listed with the the information given above. If we just want to know how many modules are installed and what size they are, we only really need the Size: – so we use grep
dmidecode -t 17 grep Size
From this we can see that 8x 2048MB modules are installed – so all the slots on the motherboard are populated.
There is plenty of other useful information that can be retrieved using dmidecode, including
-t1 System
-t2 Base Board
-t3 Chassis
-t4 CPU
-t9 PCI slots
Full SMIBIOS Specification
1 System
2 Base Board
3 Chassis
4 Processor
5 Memory Controller
6 Memory Module
7 Cache
8 Port Connector
9 System Slots
10 On Board Devices
11 OEM Strings
12 System Configuration Options
13 BIOS Language
14 Group Associations
15 System Event Log
16 Physical Memory Array
17 Memory Device
18 32-bit Memory Error
19 Memory Array Mapped Address
20 Memory Device Mapped Address
21 Built-in Pointing Device
22 Portable Battery
23 System Reset
24 Hardware Security
25 System Power Controls
26 Voltage Probe
27 Cooling Device
28 Temperature Probe
29 Electrical Current Probe
30 Out-of-band Remote Access
31 Boot Integrity Services
32 System Boot
33 64-bit Memory Error
34 Management Device
35 Management Device Component
36 Management Device Threshold Data
37 Memory Channel
38 IPMI Device
39 Power Supply
40 Additional Information
41 Onboard Device
Linux Check Memory Size
How to find memory slots, DIMM info in linux from dmidecode
Some time back I was using a command called meminfo in Solaris to find the memory information in Solaris. It is indeed a nice script written by schmidt http://www.4schmidts.com/memconf.html .
Later, I moved my role from supporting Solaris systems to Linux systems and I was struggling to get the same piece of info in Linux about the memory bank/slot and how memory is present in each memory bank. Today I got an audit work to validate the system data that someone has filled about Linux servers. So, this time I couldn’t escape and I had to find a way out. I always knew that there should be info in dmidecode command, but as usual my laziness was stopping me from looking in to the output.
So finally I had to push my lazy attitude and dive in to the Info which dmidecode was giving. I was really surprised to see that there is enough info that we can grab from the dmidecode output. So here is my analysis.
- First check the actual memory Info from the either “top” or “free -m” command.
- Check the “dmidecode” output for the DIMM slot and each RAM size
FREE COMMAND OUTPUT
So the below command shows that we have around 2GB of memory installed in the system.
[root@bravo]# free -m
total used free shared buffers cached
Mem: 2026 1585 440 0 222 551
-/+ buffers/cache: 811 1215
Swap: 4094 0 4094
TOP COMMAND OUTPUT
Let’s verify our understanding of memory available using the TOP command which also shows that we have approx 2GB memory approx.
[root@bravo]# top
top – 13:18:56 up 216 days, 4:12, 3 users, load average: 0.14, 0.11, 0.09
Tasks: 199 total, 1 running, 198 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.8% us, 1.4% sy, 0.0% ni, 97.4% id, 0.3% wa, 0.0% hi, 0.0% si
Mem: 2074900k total, 1623648k used, 451252k free, 227816k buffers
Swap: 4192924k total, 296k used, 4192628k free, 565160k cached
DMIDECODE COMMAND
Run the DMIDECODE command and look for the data where the word “Physical Memory Array” starts and go through each line to get detailed information. In some new systems you can also use the command dmidecode –s memory and dmidecode –t 17 , where “s” means string and “t” means type. Let’s just use dmidecode here for now.
Summary of the memory data
——————————————————————————————-
Maximum memory that the ON BOARD memoryslots can accept is= 8GB
Type of memory = DDR
Error Correction Type: Single-bit ECC
Size of each DIMM = 1024 MB (1GB)
DIMM Speed = 333 MHz (3.0 ns)
Number of DIMM slots = Total4 DIMM slots and only 2 DIMM slots are filled with 1GB memory each
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Note: where ever the Memory module is not installed the “Size” would show as “Size: No Module Installed”
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——————————————————————————————-
[root@bravo]# dmidecode more
So here is the summary of the Info that we are looking from the Important Information we have from the dmidecode data
Handle 0x1000
DMI type 16, 15 bytes.
Physical Memory Array
Location: System Board Or Motherboard
Use: System Memory
Error Correction Type: Single-bit ECC
Maximum Capacity: 8 GB
Error Information Handle: Not Provided
Number Of Devices: 4
Handle 0x1100
DMI type 17, 23 bytes.
Memory Device
Array Handle: 0x1000
Error Information Handle: Not Provided
Total Width: 72 bits
Data Width: 64 bits
Size: 1024 MB
Form Factor: DIMM
Set: 1
Locator: DIMM 01
Bank Locator: Not Specified
Type: DDR
Type Detail: Synchronous
Speed: 333 MHz (3.0 ns)
Handle 0x1101
DMI type 17, 23 bytes.
Memory Device
Array Handle: 0x1000
Error Information Handle: Not Provided
Total Width: 72 bits
Data Width: 64 bits
Size: 1024 MB
Form Factor: DIMM
Set: 1
Locator: DIMM 02
Bank Locator: Not Specified
Type: DDR
Type Detail: Synchronous
Speed: 333 MHz (3.0 ns)
Handle 0x1102
DMI type 17, 23 bytes.
Memory Device
Array Handle: 0x1000
Error Information Handle: Not Provided
Total Width: 72 bits
Data Width: 64 bits
Size: No Module Installed
Form Factor: DIMM
Set: 2
Locator: DIMM 03
Bank Locator: Not Specified
Type: DDR
Type Detail: Synchronous
Speed: 333 MHz (3.0 ns)
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Handle 0x1103
DMI type 17, 23 bytes.
Memory Device
Array Handle: 0x1000
Error Information Handle: Not Provided
Total Width: 72 bits
Data Width: 64 bits
Size: No Module Installed
Form Factor: DIMM
Set: 2
Locator: DIMM 04
Bank Locator: Not Specified
Type: DDR
Type Detail: Synchronous
Speed: 333 MHz (3.0 ns)
So here is my learning for the day. So I am signing of for the day looking forward to learn something new tomorrow. Infact there are couple of things that I have learnt today and I would try to either share it today or tomorrow in my new post.
Also, one thing that I started believing these days is that there is no job which is small or waste of time. We just have to look at the learning that we can grab from it. I am sure every job teaches us something might not be technical always but I am sure we would have some thing to learn from it directly or in directly.
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Adios ! Amigos !
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The desire to write grows with writing.Desiderius Erasmus