2 things:
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It’s more the determinacy, a GC randomly fires up and your systems stops for some long amount of time. There are pauseless GCs but that’s a different nightmare.
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The kernel has things similar to GCs. They’re used for more specialized tasks, and some (like rcu) are absolute nightmares that have take decades to get working.
Because China executes at a rate 100x the US, that we know of, believed to be 1000x.
No person, no prisoner. --Stalin
Also, Tibet and Xinjiang.