Linux Free command and top utility

Both the free command and the top utility are useful tools for monitoring system resources on a Linux system.

The free command displays information about the system's memory usage, including the total amount of memory available, the amount of memory currently in use, and the amount of memory that is free. It also shows information about the system's swap usage.

The output of the free command looks like this:

vbnet
              total        used        free      shared  buff/cache   available
Mem:        2042740      625048      658456        4632      758236     1295360
Swap:       1048572           0     1048572

Here, you can see that the system has 2,042,740 kilobytes of memory installed, and that 625,048 kilobytes are currently in use, while 658,456 kilobytes are free. The shared column shows the amount of memory being used by shared memory segments, while the buff/cache column shows the amount of memory used by the system's buffer cache. The available column shows the amount of memory that is available for new processes to use.

The top utility is a real-time system monitoring tool that shows information about the system's processes, including their CPU usage, memory usage, and other information. It is useful for identifying processes that are using a lot of system resources, and for monitoring system performance over time.

The output of the top command looks like this:

The output of the top command looks like this:

yaml
top - 16:47:27 up 9 days,  2:23,  1 user,  load average: 0.00, 0.00, 0.00
Tasks: 129 total,   1 running, 128 sleeping,   0 stopped,   0 zombie
%Cpu(s):  0.0 us,  0.0 sy,  0.0 ni,100.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
MiB Mem :   1989.9 total,    325.6 free,   1188.6 used,    475.7 buff/cache
MiB Swap:   1024.0 total,    981.8 free,     42.2 used.    488.4 avail Mem 

    PID USER      PR  NI    VIRT    RES    SHR S  %CPU  %MEM     TIME+ COMMAND                                                                                                                                                                                                                                       
      1 root      20   0  168844  12328   8900 S   0.0   0.6   0:09.92 systemd                                                                                                                                                                                                                                       
      2 root      20   0       0      0      0 S   0.0   0.0   0:00.00 kthreadd                                                                                                                                                                                                                                      
      3 root       0 -20       0      0      0 I   0.0   0.0   0:00.00 rcu_gp                                                                                                                                                                                                                                        
      4 root       0 -20       0      0      0 I   0.0   0.0   0:00.00 rcu_par_gp                                                                                                                                                                                                                                    
      5 root      20   0       0      0      0 I   0.0   0.0   0:00.00 kworker/0:0-eve

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