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DragonFly BSD is a free and open-source Unix-like operating system forked from FreeBSD 4.8. Matthew Dillon , an Amiga developer in the late 1980s and early 1990s and FreeBSD developer between 1994 and 2003, began working on DragonFly BSD in June 2003 and announced it on the FreeBSD mailing lists on 16 July 2003.
A user thread either runs at user-kernel priority (when it is actually running in the kernel, e.g. running a syscall on behalf of userland), or a user thread runs at user priority. DragonFly does preempt, it just does it very carefully and only under particular circumstances. An LWKT interrupt thread can preempt most other threads, for example ...
Concerned with problems he saw in the direction FreeBSD 5.x was headed in regards to concurrency, [10] and coupled with the fact that Dillon's access to the FreeBSD source code repository was revoked due to a falling-out with other FreeBSD developers, he started the DragonFly BSD project in 2003, implementing the SMP model using light-weight ...
DragonFly BSD considers itself to be "the logical continuation of the FreeBSD 4.x series." [39] FireflyBSD has a similar logo, a firefly, showing its close relationship to DragonFly BSD. In fact, the FireflyBSD website states that proceeds from sales will go to the development of DragonFly BSD, suggesting that the two may in fact be very ...
CRUX is a Linux distribution mainly targeted at expert computer users. It uses BSD-style initscripts and utilizes a ports system similar to a BSD-based operating system. Chimera Linux: Chimera Linux is a Linux distribution created by Daniel Kolesa, a semi-active contributor to Void Linux. It uses a userland and core utilities based on FreeBSD.
HAMMER is a high-availability 64-bit file system developed by Matthew Dillon for DragonFly BSD using B+ trees.Its major features include infinite NFS-exportable snapshots, master–multislave operation, configurable history retention, fsckless-mount, and checksums to deal with data corruption. [5]
OpenBSD was forked from NetBSD in 1995, and DragonFly BSD was forked from FreeBSD in 2003. BSD was also used as the basis for several proprietary versions of Unix, such as Sun's SunOS, Sequent's DYNIX, NeXT's NeXTSTEP, DEC's Ultrix and OSF/1 AXP (now Tru64 UNIX). NeXTSTEP later became the foundation for Apple Inc.'s macOS.
systat is a BSD UNIX console application for displaying system statistics in fullscreen mode using ncurses/curses.It is available on, and by default ships in the base systems of, FreeBSD, NetBSD, OpenBSD and DragonFly BSD.