On 2024-01-11 at 15:25, Stefan Monnier wrote: >> manufacturers in different memory banks, but since it's always >> possible to power down, replace or just remove memory, and power up >> again, > > Hmm... "always"? What about long running computations like that > simulation (or LLM training) launched a month ago and that's expected > to finish in another month or so? > > Some mainframes have supported hot (un)plugging RAM modules as well > and I wouldn't be surprised if some x86 servers also support it > nowadays.
I remember, in my previous job (back in the oughts, now), one occasion on which I was going around adding RAM to various desktop computers in the area under my purview, by adding more DIMMs to the open slots - and discovering, when I put the case back together on one of those computers and went to power it back on, that *it was already powered on and the system was still booted*. Surprisingly, none of the hardware showed any sign of damage, and the system recognized the RAM just fine after a reboot. But it was a bit of a jolt at the time to realize that I'd just done parts surgery, however mild, on a powered and running system. -- The Wanderer The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man. -- George Bernard Shaw
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