Post B2oVRDF6MEvf2PnhWC by odc@mstdn.io
 (DIR) More posts by odc@mstdn.io
 (DIR) Post #B2oVRDF6MEvf2PnhWC by odc@mstdn.io
       2026-01-30T14:22:14Z
       
       0 likes, 0 repeats
       
       > Olivier.SysAdmin logged out 01/30/26  1519.7 cet Fri> CPU usage 22 sec, memory usage 74.8 units, cost $186.49.> hangup> Multics has disconnected youThat thing is not cheap 😬
       
 (DIR) Post #B2oVREalLBqlDswVv6 by wolf480pl@mstdn.io
       2026-01-30T14:45:00Z
       
       0 likes, 0 repeats
       
       @odcMultics?
       
 (DIR) Post #B2oWpTimqEMX3AovHE by odc@mstdn.io
       2026-01-30T15:00:37Z
       
       0 likes, 0 repeats
       
       @wolf480pl yeah I've been playing with the DPS8/M emulator lately to run Multics. It's very educational. Makes you realize the huge set back that UNIX was.
       
 (DIR) Post #B2oXKFaxPdneDPpbyC by wolf480pl@mstdn.io
       2026-01-30T15:06:12Z
       
       0 likes, 0 repeats
       
       @odc can you tell me more about how it was better (or have a link to sth i could read) ?
       
 (DIR) Post #B2oYSwjL1Lo0GeSh2u by odc@mstdn.io
       2026-01-30T15:18:58Z
       
       1 likes, 0 repeats
       
       @wolf480pl I like the first part of this course which does a broad comparison between Multics and modern OSs https://www.youtube.com/watch?v=MKvKre0b2GMOther than that, wikipedia, multicians.org, and in particular this article which explains why many of the issues with UNIX (segfaults, null pointers deref...) were much less problematic on Multics: https://multicians.org/exec-env.html
       
 (DIR) Post #B2oZSYAgQjrW3NcxNY by odc@mstdn.io
       2026-01-30T15:22:20Z
       
       0 likes, 0 repeats
       
       @wolf480pl Also keep in mind Multics was designed to be fully reconfigurable, which means you could add more RAM and CPUs at runtime. No reboot required. Not many OS can do that today.
       
 (DIR) Post #B2oZSZc14bJuWRQIca by wolf480pl@mstdn.io
       2026-01-30T15:30:04Z
       
       0 likes, 0 repeats
       
       @odc hmmI think I heard of z/OS supporting that.Sun Fire E25K machines also had hot-swappable CPU and RAM, so Solaris must've supported that.On Linux side... I think I managed to hot-add CPU corse in a Xen VM with Linux inside, and it messed up the counters that htop uses, but otherwise was fine. Don't remember if hot-removing works.RAM is ugh... I know baloon works for VMs, but idk if that'd work with real HW.But what you'd want for real HW is hot-swapping entire numa nodes :/
       
 (DIR) Post #B2oaA9GUOPa7Y88GCO by odc@mstdn.io
       2026-01-30T15:38:00Z
       
       0 likes, 0 repeats
       
       @wolf480pl Yeah, Linux has come a long way. But Multics was out in the 60s and 70s. If you compare it with the early versions of Unix (like the recently discovered v4), the difference is HUGE.