Linux Memory Slot Information
- Linux Free Memory
- Linux Memory Slot Information Check
- Linux Memory Slot Information Software
- Linux Memory Slot Information Sheet
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 .
Slot: L3-Cache size: 6MiB capacity: 6MiB clock: 1GHz (1.0ns) capabilities: pipeline-burst internal write-back unified configuration: level=3.-memory description: System Memory physical id: 32 slot: System board or motherboard size: 32GiB.-bank:0. Linux Memory Slots Info certainly can! Internet casinos normally offer US players the chance to gamble in US Dollars, Canadian Dollars, Euros, Great British Pounds Linux Memory Slots Info and other legal tender. Some also offer gaming in dozens of other currencies as well. In this way, you can deposit funds and collect winnings in your local.
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
Note: where ever the Memory module is not installed the “Size” would show as “Size: No Module Installed”
——————————————————————————————-
[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
Linux Free Memory
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)
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.
Adios ! Amigos !
The desire to write grows with writing.Desiderius Erasmus
Most of the system administrators checks CPU & Memory utilization when they were facing some performance issue.
There is lot of utilities are available in Linux to check physical memory.These commands are help us to check the physical RAM present in system, also allow users to check memory utilization in varies aspect.
Most of us know only few commands and we are trying to include all the possible commands in this article.You may think, why I want to know all these commands instead of knowing some of the specific and routine commands.
Don’t think bad or don’t take in negative way because each one has different requirement and perception so, who’s looking for other purpose then this will very helpful for them.
What is RAM
Computer memory is a physical device which capable to store information temporarily or permanently. RAM stands for Random Access Memory is a volatile memory that stores information used by the operating system, software, and hardware.
Two types of memory is available.
- Primary Memory
- Secondary Memory
Primary memory is the main memory of the computer. CPU can directly read or write on this memory. It is fixed on the motherboard of the computer.
RAM:Random Access Memory is a temporary memory. This information will go away when the computer is turned off.ROM:Read Only Memory is permanent memory, that holds the data even if the system is switched off.
Method-1 : Using free Command
free displays the total amount of free and used physical and swap memory in the system, as well as the buffers and caches used by the kernel. The information is gathered by parsing /proc/meminfo.
Suggested Read : free – A Standard Command to Check Memory Usage Statistics (Free & Used) in Linux
Method-2 : Using /proc/meminfo file
/proc/meminfo is a virtual text file that contains a large amount of valuable information about the systems RAM usage.
It reports the amount of free and used memory (both physical and swap) on the system.
Method-3 : Using top Command
Top command is one of the basic command to monitor real-time system processes in Linux. It display system information and running processes information like uptime, average load, tasks running, number of users logged in, number of CPUs & cpu utilization, Memory & swap information. Run top command then hit E to bring the memory utilization in MB.
Suggested Read : TOP Command Examples to Monitor Server Performance
Method-4 : Using vmstat Command
vmstat is a standard nifty tool that report virtual memory statistics of Linux system. vmstat reports information about processes, memory, paging, block IO, traps, and cpu activity. It helps Linux administrator to identify system bottlenecks while troubleshooting the issues.
Suggested Read : vmstat – A Standard Nifty Tool to Report Virtual Memory Statistics
Method-5 : Using nmon Command
nmon is a another nifty tool to monitor various system resources such as CPU, memory, network, disks, file systems, NFS, top processes, Power micro-partition and resources (Linux version & processors) on Linux terminal.
Just press m key to see memory utilization stats (cached, active, inactive, buffered, free in MB & free percent)
Suggested Read : nmon – A Nifty Tool To Monitor System Resources On Linux
Method-6 : Using dmidecode Command
Dmidecode is a tool which reads a computer’s DMI (stands for Desktop Management Interface)
(some say SMBIOS – stands for System Management BIOS) table contents and display system hardware information in a human-readable format.
This table contains a description of the system’s hardware components, as well as other useful information such as serial number, Manufacturer information, Release Date, and BIOS revision, etc,.
Suggested Read :
Dmidecode – Easy Way To Get Linux System Hardware Information
Print only installed RAM modules.
Sum all the installed RAM modules.
Linux Memory Slot Information Check
Method-7 : Using hwinfo Command
hwinfo stands for hardware information tool is another great utility that used to probe for the hardware present in the system and display detailed information about varies hardware components in human readable format.
It reports information about CPU, RAM, keyboard, mouse, graphics card, sound, storage, network interface, disk, partition, bios, and bridge, etc,.
Suggested Read : hwinfo (Hardware Info) – A Nifty Tool To Detect System Hardware Information On Linux
Method-8 : Using lshw Command
lshw (stands for Hardware Lister) is a small nifty tool that generates detailed reports about various hardware components on the machine such as memory configuration, firmware version, mainboard configuration, CPU version and speed, cache configuration, usb, network card, graphics cards, multimedia, printers, bus speed, etc.
It’s generating hardware information by reading varies files under /proc directory and DMI table.
Suggested Read : LSHW (Hardware Lister) – A Nifty Tool To Get A Hardware Information On Linux
Method-9 : Using inxi Command
inxi is a nifty tool to check hardware information on Linux and offers wide range of option to get all the hardware information on Linux system that i never found in any other utility which are available in Linux. It was forked from the ancient and mindbendingly perverse yet ingenius infobash, by locsmif.
inxi is a script that quickly shows system hardware, CPU, drivers, Xorg, Desktop, Kernel, GCC version(s), Processes, RAM usage, and a wide variety of other useful information, also used for forum technical support & debugging tool.
Suggested Read : inxi – A Great Tool to Check Hardware Information on Linux
Method-10 : Using screenfetch Command
screenFetch is a bash script. It will auto-detect your distribution and display an ASCII art version of that distribution’s logo and some valuable information to the right.
Suggested Read : ScreenFetch – Display Linux System Information On Terminal With Distribution ASCII Art Logo
Method-11 : Using neofetch Command
Neofetch is a cross-platform and easy-to-use command line (CLI) script that collects your Linux system information and display it on the terminal next to an image, either your distributions logo or any ascii art of your choice.
Suggested Read : Neofetch – Shows Linux System Information With ASCII Distribution Logo
Method-12 : Using dmesg Command
dmesg (stands for display message or driver message) is a command on most Unix-like operating systems that prints the message buffer of the kernel.
Method-13 : Using atop Command
Atop is an ASCII full-screen system performance monitoring tool for Linux that is capable of reporting the activity of all server processes (even if processes have finished during the interval).
It’s logging of system and process activity for long-term analysis (By default, the log files are preserved for 28 days), highlighting overloaded system resources by using colors, etc. It shows network activity per process/thread with combination of the optional kernel module netatop.
Suggested Read : Atop – Monitor real time system performance, resources, process & check resource utilization history
Method-14 : Using htop Command
htop is an interactive process viewer for Linux which was developed by Hisham using ncurses library. Htop have many of features and options compared to top command.
Suggested Read : Monitor system resources using Htop command
Method-15 : Using corefreq Utility
CoreFreq is a CPU monitoring software designed for Intel 64-bits Processors and supported architectures are Atom, Core2, Nehalem, SandyBridge and superior, AMD Family 0F.
CoreFreq provides a framework to retrieve CPU data with a high degree of precision.
Suggested Read : CoreFreq – A Powerful CPU monitoring Tool for Linux Systems
Method-16 : Using glances Command
Glances is a cross-platform curses-based system monitoring tool written in Python. We can say all in one place, like maximum of information in a minimum of space. It uses psutil library to get information from your system.
Glances capable to monitor CPU, Memory, Load, Process list, Network interface, Disk I/O, Raid, Sensors, Filesystem (and folders), Docker, Monitor, Alert, System info, Uptime, Quicklook (CPU, MEM, LOAD), etc,.
Suggested Read : Glances (All in one Place)– An Advanced Real Time System Performance Monitoring Tool for Linux
Linux Memory Slot Information Software
Method-17 : Using gnome-system-monitor
Linux Memory Slot Information Sheet
System Monitor is a tool to manage running processes and monitor system resources. It shows you what programs are running and how much processor time, memory, and disk space are being used.