The number showed by the memory meter is the total memory used by Getting comfortable with using it can help you detect problems easily and quickly or verify that system performance is good.The MEM% number is low, but the bar looks almost full. The htop tool provides a lot of important information on running processes and can be very useful when looking for problems that might slow down the system. Quit htop by typing “q” or by using the F10 key. When you start htop up again, it will start using whatever sort order you last used. As you can see, a number of sorting options are available. Then hit the enter key to get back to viewing the processes using the new sort order. To sort the display by CPU usage, press the F6 key and select select PERCENT_CPU. TIME+ – the time the process has used since it started, measured in hundredths of a second (e.g., 2:34.56 means 2 minutes, 34 seconds and 56 hundredths of a second).NI – the "nice" setting (priority reset by user).USER – the individual running the process.The fields displayed include this information for each process: You can scroll up and down to see additional processes using the up and down arrows on your keyboard. The larger portion of the display shows the processes, organized by PID by default. Uptime shows how long the system has been up in hours, minutes and seconds along with days if it’s been up more than a day (e.g., Uptime: 1 day, 20:18:15). The load averages show how heavily loaded the system has been over the last 1, 5 and 15 minutes. This portion of the display also shows load averages and uptime. It also shows how many processes are currently running (using the CPU). The upper right of the display shows you the number of tasks, threads ( thr) and kernel threads ( kthr). Clearly this system is not very busy since it doesn't have to swap process data out of memory. Notice in the screenshot above that memory is being significantly used, but swap isn’t being used at all.
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