There are times when you may have a need to test server performance when investigating an issue or doing a predictive analysis. I learned an easy way to do this on Linux using the built-in ‘yes’ command. From the man page for the ‘yes’ command: NAME yes - output a string repeatedly until killed This does exactly as it says and will consume the CPU unless it is controlled or killed.

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Symptoms Website randomly goes down a few times a week Server stopped responding Network and CPU logs show a small spike, but not enough to lock up a server Stopping and starting the server resolves the problem Details This pattern repeated several weeks until the customer grew tired of rebooting the server. The evidence did not seem to lead to a system issue or network or security security problem such as a denial of service.

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Chris Sereno

For 13 years networking was my profession with a specialized focus on proactive and reactive performance analysis. More recently I have embraced the AWS platform. This blog reflects my experience both past and present.

AWS Solutions Architect at