Installation

Some common installation issues

psutil/_psutil_common.c:9:10: fatal error: Python.h: No such file or directory

https://stackoverflow.com/questions/63440765/locust-installation-error-using-pip3-error-command-errored-out-with-exit-statu

Windows

https://stackoverflow.com/questions/61592069/locust-is-not-installing-on-my-windows-10-for-load-testing

Installation works, but the locust command is not available

make sure your Python script directory is mentioned in your PATH variable

Increasing Maximum Number of Open Files Limit

Every User/HTTP connection from Locust opens a new file (technically a file descriptor). Many operating systems by default set a low limit for the maximum number of files that can be open at the same time.

Locust will try to adjust this automatically for you, but in a lot of cases your operating system will not allow it (in which case you will get a warning in the log), so you need to do it manually. How to do this depends on your operating system you might find some useful information here: https://www.tecmint.com/increase-set-open-file-limits-in-linux/