stress tests CPU, memory, I/O, and HDD workloads on POSIX systems. This article shares commands to use 95% of memory to check for memory problems.
For Linux kernel < 3.14:
stress --vm-bytes $(awk '/MemFree/{printf "%d\n", $2 * 0.95;}' < /proc/meminfo)k --vm-keep -m 1 For Linux kernel >= 3.14:
stress --vm-bytes $(awk '/MemAvailable/{printf "%d\n", $2 * 0.95;}' < /proc/meminfo)k --vm-keep -m 1There are two ways to configure Raspberry Pi OS to boot into console or GUI mode. First, run # raspi-config, select "System Options", then "Boot / Auto Login".
A Linux server was reported to be using over 90% of its memory, but its administrator could not identify a memory-heavy process. My initial check with free showed nothing unusual.
There are many ways to send mail from the Linux command line. For repeated system tests, netcat can send a prepared message with one command.
