DragonFly BSD

DragonFly è un sistema operativo designato per essere la logica continuazione sulla serie FreeBSD-4.x OS. DragonFly è un fork per dare a BSD l’oppurtunità di crescere in una nuova e diversa direzione rispetto alla serie FreeBSD-5.

Versione 5.4.0

Questa versione contiene(in Inglese):

DragonFly version 5.4 brings a new system compiler in GCC 8, improved NUMA support, a large of number network and virtual machine driver updates, and updates to video support. This release is 64-bit only, as with previous releases.

The details of all commits between the 5.2 and 5.4 branches are available in the associated commit messages for 5.4.0rc and 5.4.0.

Big-ticket items

• Much better support for asymmetric NUMA (Non-Uniform Memory Access) configurations. In particular, both the memory subsystem and the scheduler now understand the Threadripper 2990WX’s architecture. The scheduler will prioritize CPU nodes with direct-attached memory and the memory subsystem will normalize memory queues for CPU nodes without direct-attached memory (which improves cache locality on those CPUs).
• Incremental performance work. DragonFly as a whole is very SMP friendly. The type of performance work we are doing now mostly revolves around improving fairness for shared-vs-exclusive lock clashes, reducing cache ping-ponging due to non-contending SMP locks (i.e. massive use of shared locks on shared resources), and so forth.
• Major updates to dports brings us to within a week or two of FreeBSD’s ports as of this writing, in particular major updates to chromium, and making the whole mess work with gcc-8.
• Major rewriting of the tty clist code and the tty locking code, significantly improving concurrency across multiple ttys and ptys.

GCC 8

• DragonFly now ships with GCC 8.0, and runs as the default compiler. It is also now used for building dports.
• GCC 4.7.4 and GCC 5.4.1 are still installed. 4.7.4 is our backup compiler, and 5.4.1 is still there to ensure a smooth transition, but should generally not be used. buildworld builds all three by default to ensure maximum compatibility.
• Many passes through world sources were made to address various warnings and errors the new GCC brought with it.

HAMMER2

• HAMMER2 is recommended as the default root filesystem in non-clustered mode.
• Clustered support is not yet available.
• Increased bulkfree cache to reduce the number of iterations required.
• Fixed numerous bugs.
• Improved support on low-memory machines.
• Significant pre-work on the XOP API to help support future networked operations.

Risorse

La distribuzione può essere scaricata da:

• ISO (989MB): http://mirror-master.dragonflybsd.org/iso-images/dfly-x86_64-5.4.0_REL.iso

Il sito web della distribuzione è: http://www.dragonflybsd.org/

Screenshot

Dragonflybsd 4.2

Conclusioni

Si può aggiornare dal ramo 4.8.x, ma perstaer attenzione alle chiavi pubbliche/private di SSH.