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How do I activate more CPUs with Ubuntu on large flavours?



I work with a x1.xxlarge instance of Ubuntu 14.04 and I see in my dmesg that only 8 CPU are activated.

$ dmesg | grep processor smpboot: Total of 8 processors activated (41499.96 BogoMIPS)

Is it possible to activate all the 32 vCPU associated with the instance’s flavour ? If yes, how ?

Thank you.