Performance · medium · live throwaway Linux box · 3 tiered hints
Sustained disk writes are hammering the box. Using iostat, identify the block DEVICE doing the most I/O and write its name (e.g. nvme0n1) to /home/player/answer.
▶ 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.
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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.