I've just noticed this paragraph:
https://mariadb.com/kb/en/mariadb-memory-allocation/#hyperthreading-and-mul…
1)
"HyperThreading is great for marketing, lousy for performance. It involves
having two processing units sharing a single hardware cache. If both units
are doing the same thing, the cache will be reasonably useful. If the units
are doing different things, they will be clobbering each other's cache
entries."
I believe it is entirely based on a misconception: HTT has nothing to do
with threads "doing the same thing".
2)
About the part that warns us from using too many cores: I believe it was
correct some years ago, but not today, or at least not for just 8 cores.
*
I don't feel comfortable deleting what others wrote, so I'll just raise the
problems here.
Federico
--
Federico Razzoli
Vettabase Ltd director & founder, Database Consultant
https://vettabase.com
federico.razzoli(a)vettabase.com
+44 7739 427279
Telegram: federico_razzoli
Skype: fede.razzoli
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