 As support for multiple processor architectures complicates symmetric multiprocessing ( SMP ) support , DragonFly BSD now limits its support to the x86 @-@ 64 platform . DragonFly originally ran on the x86 architecture , however as of version 4 @.@ 0 it is no longer supported . Since version 1 @.@ 10 , DragonFly supports 1 : 1 userland threading ( one kernel thread per userland thread ) , which is regarded as a relatively simple solution that is also easy to maintain . Inherited from FreeBSD , DragonFly also supports multi @-@ threading . 
