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OOO Bursts Stall

Dny
Beginner
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Hello All,
I was doing cycle accounting with the methodology given be David Levinthal for core micro architecture.
I observe that my applications are showing 15 - 25 % of OOO Brust. As per the paper OOO is an execution unit stall.

Can you please expain in more detil about OOO brust, cause of it and how to minimize it?

Thanking you,

Regards,
Dny
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