tmpfs - CI/CD Glossary Definition
tmpfs is a filesystem that lives in RAM (and swap) rather than on disk, so reads and writes are fast but contents vanish on unmount or reboot. /tmp and /dev/shm are often tmpfs.
In CI
Pointing a build cache or test scratch space at a tmpfs mount can dramatically speed up I/O-bound jobs. The tradeoff is that large temporary files count against memory, so an oversized tmpfs can trigger the out-of-memory killer.
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