![]() You could downgrade your processor to a lower tier, save money, and see no reduction in the quality of your server’s performance. Most servers are sold by overall computing power, and if your server is only sitting at 30% CPU usage, you’re paying for too much processor power. Most companies seek to keep the CPU usage of their servers as close to 100% as possible. Instead, if the program only required six seconds processing time on one core, the usage would be 10%. For instance, if you had a program that required uninterrupted processing power for 54 out of the last 60 seconds, your CPU usage on one core would be 90%. CPU usage is a measurement, in a percentage, of how much time the CPU spends actively computing something. Even though they might sound similar, they’re quite different. System activity reports can be generated from a logfile by using the atopsar command.The first thing to understand is that CPU load is not the same thing as CPU usage. By default, the daily logfiles are preserved for 28 days. ![]() You can then import this data for analysis, using either a spreadsheet program or a custom tool like sargraph.Īn alternative is to use atop which is able to store raw counters in a file for long-term analysis on system level and process level. ![]() ![]() Sysstat will collect background CPU usage data every minute, saving it to /var/log/sysstat/. You can generate a real-time report with the following command: sar -u 1 3 You can modify this behavior by editing the sysstat crontab at /etc/cron.d/sysstat, or by changing rotation settings in the sysstat settings at /etc/sysstat/sysstat. Next, enable it by editing /etc/default/sysstat and setting “ENABLED” to true.ĭoing so monitors your system and generates a report every 10 minutes, rotating them out after a week. ![]()
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