is cpu registers are "actually" independents on each processers, or threads right?
I mean like they cannot access or share on processers, threads
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Yes. Each logical core has its own registers. – Leeor Oct 01 '15 at 11:25
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@Leeor mean processers(like .exe files) – Jun Ryoung Ju Oct 01 '15 at 12:20
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First of all lets specify what architecture we are talking about? If it is **x86** in **protected mode** then As @Leeor has said each logical core has it's own register but processes can't share their state because of **context switch** procedure. – Ilia Maskov Oct 03 '15 at 12:31
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Possible duplicate of [Understanding cpu registers](https://stackoverflow.com/questions/45937135/understanding-cpu-registers) – Bo Persson Aug 29 '17 at 15:36
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@BoPersson: if you can edit the tags to include `[assembly]`, I can close this as a duplicate of the Q&A you found, or [How each thread can have CPU registers](https://stackoverflow.com/q/10371842). (I came across this while looking for dups for [Are x86-64 CPU registers shared among multiple cores?](https://stackoverflow.com/q/51494024)) – Peter Cordes Jul 24 '18 at 13:04