KDiskMark

What KDiskMark is

KDiskMark is a Linux disk benchmark for HDDs and SSDs, with a graphical interface built around Flexible I/O Tester (fio). It runs sequential and random I/O tests and measures IOPS and latency. For each test, users can adjust block size, queue count, and thread count, then generate a benchmark report. Systems without a graphical display can use its interactive full-screen terminal mode, which provides settings for profiles, file size, loops, storage, queues, threads, test data, cache flushing, O_DIRECT, and CoW detection. The application is written in C++ with Qt and has no KDE dependencies. It is free, and the project documents downloads through GitHub Releases, Flathub, and Linux distribution repositories. Both its GUI and terminal interface request administrator privileges through PolicyKit; the README notes that SSH sessions usually deny authentication for non-local users. Required dependencies include Qt with Widgets and DBus, a PolicyKit agent, and fio with libaio. The Snap package is no longer maintained and will receive no updates.