DragonflyBSD is a free, UNIX-like operating system that is part of the BSD family focused on performance and optimization. It is based on the same UNIX ideals and APIs and shares ancestor code with other BSD operating systems.
It contains a bunch of useful features which sets it apart from other BSD/Linux-based operating systems, one being HAMMER - it's own high-performance filesystem with built-in mirroring and historic access functionality.
Other features include:
- Virtual kernels providing the ability to run a full-blown kernel as a user process for the purpose of managing resources or for accelerated kernel development and debugging
- Token-based synchronisation mechanism for it's kernel, in turn allowing for DragonflyBSD to parallelize the system with less effort compared to other kernels, which primarily use hard mutex locks.
- Optimised for SSD usage by utilising a swapcache.
- Linux binary compatibility