Performance · pro · live throwaway Linux box · 3 tiered hints
A legitimate batch job 'batch-encoder' is CPU-hungry and starving interactive work, but it must keep running. Lower its priority by renicing it to nice 19 — do NOT kill it.
▶ Start this challengePress start and you get your own real, disposable Linux VM — in the browser terminal or over SSH. Work the task on a live system; tmpfs.tech grades your solution automatically against the actual machine state, then throws the box away. No install, free to try as a guest.
OS performance troubleshooting on a live box: hunt down CPU, memory, I/O and process problems with top, vmstat, iostat and pidstat.
See all Performance challenges →
Is it free? Yes — play as a guest, no signup required to start.
Do I need to install anything? No. Everything runs in your browser, or connect over SSH if you prefer your own terminal.
How is it graded? Automatically and deterministically — your work is checked against the real state of the machine you worked on.