Introducing rpiburn, a new tool for heavy load power supply testing. This program will make a Raspberry Pi board to consume as much current as possible, but aborts if the processor becomes overheated, a brownout (under voltage) condition occur or something else bad happens. Testing can be conducted in the background and completes in about two seconds. Handy for system health monitoring.
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I haven't tested it with Pi 4, but likely it will work to some extent. Not 100% optimized of course, but better than nothing. Feel free to help out with improving it.
Author of the robust Nard distro http://www.nard.se