![]() –human: to show the result in human-readable format.1: we’ve given 1 second as the interval.-r: to print memory statistics by default, it prints CPU details.-o: using this flag captures the output to the filename specified in a binary format.In order to get this result, we’ve used the below options: It has also printed the average for that session. The above results show that it has printed the memory details thrice with a one-second delay. Let’s look at a sample usage: $ sar -o memory.log -r 1 3 -human ![]() Unlike the other two commands we saw earlier, this prints more information about memory usage. In order to show the swap memory usage, we used the -A1 option in the grep command to print one line below the matching line. We need to press ctrl-c to quit out of the command. As a result, we can see that it has printed the main memory and swap memory usage. In addition to that, we used the grep command to filter the memory-related information. Here, we’ve used the same top command we tried before. Let’s see how that works: $ top -b -d1 -o +%MEM | grep -A1 'KiB Mem' On the other hand, if we just wanted to log the overall memory consumption, we can use the grep command to filter just that. With this, we can also see the process which uses more memory. This command will log details of all processes to the memory.log file. -o +%MEM: override the default sort option to use the %MEM column value the + sign is used to sort in descending order.-d1: set a delay of 1 second between each result.-b: enable batch mode and don’t accept input from the user.Let’s check the different options we’ve used here: And it’ll have the result of the top command every second. This list includes various details about each process and is refreshed automatically every 5 seconds.The above command redirects the result to the memory.log file. The top command generates a list of processes sorted by the parameter %CPU, or percentage of CPU consumed by a process. You can calculate the overall CPU utilization using the idle time using the formula given below:įor example, in the output above, the idle time is 98.3%, so the CPU utilization can be calculated as follows: In the output above, the top command displays various important CPU statistics, including idle time and wait time. It is one of the most widely used commands for tracking the CPU utilization, process statistics, and memory utilization of a Linux system.įor example, running the top command on a Linux system will display an output similar to the one shown below: Fig 1: Output of top command It displays various crucial system metrics along with a set of processes that are currently being managed by the Linux kernel. The top command is used to display a real-time, dynamic view of a running system. Browser tabs with ads or auto-playing videos are openĪpplications or programs that require high processing power, including video editing software and high-resolution video games-can easily drive up CPU usage.Multiple plugins and add-ons are running in the background.Several tabs are opened at the same time.BrowserĮven the browser can cause high CPU usage if: These are often invisible and heavily utilize the CPU. If a system becomes extremely slow with a CPU usage of nearly 100%-but with no clear cause-the problem may be a virus or malware. Too many background processes running simultaneously on a computer consume CPU resources and unnecessarily cause high CPU usage. Autostart programs and background processesĪutostart programs are applications that are launched automatically when booting the operating system and they continue to run in the background. If the idle process is taking up to 99% of the CPU's power, it means only 1% is being used to run actual tasks.Ģ. ![]() ![]() This process appears to show high CPU usage, but it actually indicates the percentage of CPU capacity not being used. If a system is idle, the OS creates a process called the System Idle Process to prevent the system from shutting off. Higher than average CPU usage can often be attributed to one of the following causes: 1. ![]() Since high CPU utilization indicates poor system performance, it should be avoided. ![]()
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