Displaying Memory Usage Statistics for a Specific Process Group $ free -g 1 This will display memory usage statistics every 10 seconds, which can be useful for monitoring system's memory usage over time. Displaying Memory Usage Statistics for a Specific Interval $ free -t 10 This will display memory usage statistics in kilobytes, which can be useful for systems with limited memory resources. Displaying Memory Usage Statistics in a Specific Unit $ free -k "-o" flag specifies that output should be in a "long" format. This will display memory usage statistics in a specific format, which can be useful for scripting or parsing output. Displaying Memory Usage Statistics in a Specific Format $ free -o Then, use "free" command with "-u" flag to display memory usage statistics for that user. First, switch to user account using "sudo su" command. This will display memory usage statistics for a specific user, such as root user or another user on system. Displaying Memory Usage Statistics for a Specific User $ sudo su Then, use "pmap" command with PID to display detailed memory usage information for that process. First, use "ps" command to find process ID (PID) of process you want to check. This will display memory usage statistics for a specific process, such as Firefox web browser. Displaying Memory Usage Statistics for a Specific Process $ ps aux | grep firefox "-c" flag specifies that output should be cleared before each update. This will display memory usage statistics in a continuous loop, with a delay of 2 seconds between each update. Displaying Memory Usage in a Continuous Loop with a Delay of 2 Seconds $ free -s 2 -c This will display memory usage statistics in gigabytes, which is useful for systems with a large amount of memory. Displaying Memory Usage in Gigabytes $ free -g This will display memory usage statistics in megabytes, which can be easier to read than default format in bytes. Here are a few more examples of how to use "free" command with different flags − Displaying Memory Usage in Megabytes $ free -m This will display memory usage statistics for physical memory only. If you only want to see statistics for physical memory, you can use "-t" flag to exclude swap space statistics. For example, following command will display memory usage statistics every 5 seconds − $ free -s 5īy default, "free" command displays memory usage statistics for both physical memory and swap space. If you want to continuously monitor your system's memory usage, you can use "-s" flag to specify a delay between each update. This will display output in a format that's easier to read, using units such as "MB" and "GB" instead of bytes. Fortunately, you can use "-h" flag to display output in a more human-readable format. This can be difficult to read, especially if you're dealing with large amounts of memory. Using "-h" Flagīy default, "free" command displays memory usage statistics in bytes. "available" field shows amount of memory that is actually available for new processes to use, taking into account memory used for disk caching. Instead, this is displayed in "buff/cache" field. It's important to note that values displayed in "used" field do not include memory used for disk caching. Shared − amount of memory that is shared between different processes.īuff/cache − amount of memory used for disk caching.Īvailable − amount of memory that is available for new processes to use. Used − amount of memory that is currently being used by your system.įree − amount of memory that is currently available for use. Total − total amount of physical memory available to your system. Here's an example output − total used free shared buff/cache available However, once you understand different fields, it becomes easier to read and interpret. The output of "free" command can be a bit overwhelming, especially if you're new to Linux. This will display memory usage statistics for your system. Just open up a terminal and type in "free" followed by any optional flags. It provides detailed information about amount of memory being used, amount of free memory available, and amount of memory being used by system's kernel. The "free" command is a built-in tool in Linux that displays information about system's memory usage. In this article, we will go over how to use "free" command to check memory usage in Linux. Fortunately, Linux provides a built-in tool called "free" that allows you to check your system's memory usage. It is an important metric to keep track of, as excessive memory usage can cause your system to slow down or even crash. Memory usage refers to amount of memory being used by your computer at any given time. If you are a Linux user, you may have heard of term "memory usage".
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