That begs the questions 1) what did ps do in redhat 8? and 2) what is top doing different?
Sure it can. If an app has buttloads of threads, most of which have never used much of their stack allocation, the total of the SZ column in ps could indeed be lower than the total of the 'used' column in the output of free. SZ can include address space for which neither physical memory nor swap space has been committed yet.
If I need to understand the memory usage on my system I need to know the *real* memory used, not allocated. Allocated isn't very useful at all, only being good for understanding why you suddenly can't allocate any more memory even though you seem to be using much less than the theoretical limit.
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