Showing memory usage in Linux by process and user
Dec 24, · 3) How to Check Memory Usage on Linux Using the vmstat Command The vmstat command is another useful tool for reporting virtual memory statistics. vmstat reports information about processes, memory, paging, block IO, traps, disks, and cpu functionality. vmstat does not require special permissions, and it can help identify system bottlenecks. Mar 13, · There are a few ways to check your memory usage in WHM or cPanel control panels. You may check the general overview of the server status via WHM > Server Information and WHM > Service Status, which also includes information about memory usage.
It is essential that your Linux system runs at an optimal level. A few simple terminal commands provide access to all relevant information and help you monitor memory statistics.
We also provide detailed explanations of what they do and more importantly, how to interpret the results. The commands will work with nearly all Linux distributions. In this instance, the commands and the results are presented using Ubuntu This is how to make a paper lantern mobile virtual file that reports the amount of available and used memory.
The output might differ slightly based on the architecture and operating system in question. Typing free in your command terminal provides the following result:. However, it is easier to understand. The key figure being the available value as it displays how much memory is still available for running new applications. The free command has multiple options to format the output so that it better matches your requirements. How to get free internet on your sidekick 08 table below lists the most useful variations of the free command.
Note: As with most commands, entering man free displays an overview of all variations and descriptions of the results. The vmstat command is a useful tool that reports virtual memory statistics. The detailed description listed below provides an explanation for each value in case you need assistance in analyzing the results. The top command is useful to check memory and CPU usage per process.
It displays information about:. Aside from providing you with essential memory information, the top command provides a limited interactive interface. It is possible to manipulate and configure operations by using command-line options.
The man command in Linux man top provides a comprehensive list of all available variations. The information the htop command provides is similar to the top command. However, the real advantage to the htop command is its user-friendly environment and improved controls. The command uses color for its output, provides full command lines for processes, as well as the option to scroll both vertically and horizontally.
Using a graphical interface for server administration is not common practice. However, certain data sets are much clearer, with a visual representation of memory usage. This guide provided several options to check memory usage on your Linux system. We learned that a single command provides an abundance of valuable data for future analysis.
Learning to interpret the information correctly is critical. How to Check Disk Space in Linux. This tutorial shows how to display disk usage from a command line in Linux.
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His articles aim to instill a passion for innovative technologies in others by providing practical advice and using an engaging writing style. In this tutorial, how to check memory usage in linux based server five powerful commands to check memory usage in Linux.
Commands to Check Memory Use in Linux. Procs r: number of processes waiting for run time. Memory swpd: amount of virtual memory used. System in: number of interrupts per second, including the clock.
Before Linux 2. The lower section structures the detailed data, per process. This allows you to perform actions on individual processes with ease. The shortcuts listed at the bottom of the screen will enable you to manipulate and customize the processes quickly and without the need to type specific commands. Enter System Monitor in the search bar and access the application.
Select the Resources tab. A graphical overview of your memory consumption in real time, including historical information is displayed. Now you can administer your server more efficiently. Next you should also read.
Mar 11, · There are plenty of ways you can get the lowdown on memory usage within your Linux system. In this roundup, we’ll cover the most commonly used command-line methods: free, vmstat, and top. We’ll also look at reading /proc/meminfo directly. How Linux Uses RAM. You can check memory usage (in percentage) of all the process running on your Linux operating system with the following command: $ ps -o pid,user, % mem, command ax | sort -b -k3 -r As you can see, all the processes with memory usage in percentage is listed in descending order (The processes using most of the memory is listed first). One of the best commands for looking at memory usage is top. One extremely easy way to see what processes are using the most memory is to start top and then press shift+m to switch the order of the.
For your reference:. There is a variety of different common SSH tools that can provide memory-related information. This tool is one of the most basic, simple and fast ways to check overall memory usage via the command line. Its purpose is to show the amount of free memory available in the system: both physical and swap memory, and any buffers used by kernel.
When you run this command, you will see something like this:. Here are the columns displayed: Total: specifies the actual amount of physical RAM and swap available in the system Used: shows how much is currently used by the system and its processes Free: shows the amount of memory that is not occupied at the moment Shared , buffers and cache: shows the amount of memory used by kernel for particular purposes, such as shared between different processes or allocated to cache.
There is one nuance you would want to take into account when analyzing the output of the free command. You might occasionally notice very small values for Mem line in the free column. Does it mean there is no free RAM in the system? In most cases, it actually does not since Linux-based systems often use cache for many processes to speed up and optimize programs performance. Only free memory is used for cache, and the system can always clear and replace content of the memory used for cache if there is such a need per requests of other running processes, so it does not actually have any negative impact on the performance.
So, the memory currently occupied by cache is technically not free, but practically can be freed at any moment. This field displays the amount of technically free memory plus currently cached and buffered memory, therefore, it is a more accurate representation of memory currently available for new processes if such a need arises.
Free command has a few parameters that may be useful. By default, the command displays the output shown in the screenshot. If you add -m or -g after the command, you will get the stats displayed in MB or GB correspondingly.
In the modern versions of the free tool you can also use -h, and the tool will automatically use the most convenient units, like this:. This tool displays information about the current virtual memory usage: processes, memory, paging, disks and CPU statistics. When running this command, you will see three lines, first describing the particular sections of the table, second specifies the values displayed, third provides the actual stats at the moment of checking.
If you need to check the usage from time to time, you can also add two numbers after the command to specify the delay in seconds between each check and the number of overall checks if not specified, the checks are infinite until you end the process. Here is an example of the output:. Procs shows information about processes: r means the number of processes running or waiting for run time, b means processes sleeping.
Memory section: swpd shows virtual memory used, free shows idle memory, buff and cache display memory allocated to buffers and cache correspondingly. Two values in the swap section display amounts of data swapped to si and from so disk per second. In the system section in stands for interrupts per second, and cs is the abbreviation for context switches.
This tool also provides another way to structure this information. Feel free to use the -s parameter to display stats:. By default, this tool shows the processes currently launched and additional information on them. The output does not show any memory-related information, only the processes ran by the actual user starting the command. The real strength of this tool lies in its parameters.
For instance, you can use -e to display processes of all users, -o to display data in a custom format and list a value like vsz in the formatting to display the size of virtual memory allocated for the process expressed in kilobytes , or pmem to display percentage memory usage by a particular process.
This will display the processes run by users which the current shell is allowed to check in a user-defined format process ID, memory usage, command name , and also sorted by the amount of memory used. When you need to monitor resource usage of your system in real time, it is better to use tools that natively support constantly refreshing output of data, or even an interactive interface to modify the current workflow of the system.
The output of the commands also includes information about memory usage and allows to sort through processes in different ways. You can use h or? PageUp and PageDown scroll through the output. The m key shows or hides memory-related information. Once again, feel free to use h or? Skip to content. Browse through our wide range of reliable and ready to deploy products and services that support the demands of your website, or application.
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