Ask HN: Why did stack-based CPUs lose out?

Re:Ask HN: Why did stack-based CPUs lose out? by nynx on Saturday December 31, 2022 @04:47PM (#34201103)

You can have one disruptive rad event every 10 minutes if you compare and correct state between three or five computers at something 100 Hz.

And a more recent computer that isn't designed for rad-environments will automatically be way more efficnent than a rad-hardened one.

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Re:Ask HN: Why did stack-based CPUs lose out? by shagie on Saturday December 31, 2022 @05:28PM (#34201400)

What set of processors would your recommend putting in Perseverance with a 110 watt power budget? Or on JWST with its heat dissipation requirements?

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Re:Ask HN: Why did stack-based CPUs lose out? by tlb on Sunday January 01, 2023 @08:11AM (#34206013)

Yes, but you have to compare the complete state of each computer for this to work, including every bit of memory & cache. You can't have much RAM if you're planning to compare them in a few milliseconds.

If you try to do this without comparing the whole state, and only comparing the outputs of some control algorithm between the computers, one of them could have some internal state corrupted and remain unnoticed for a long time, long enough for other corruptions to happen on the other computers, and then you have no straightforward way to figure out which one to trust and which to reset.

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