Lshw shows 6 cpu's onJetson nano,howto activate

Autonomous Machines Jetson & Embedded Systems Jetson Nano
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How can one activate these cpu’s

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Moving this topic to the Jetson Nano category for the Jetson support team to see.

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For generally enabling all cores, see:
https://forums.developer.nvidia.com/t/two-cores-disabled/48637/21

To use the isolated CPUs for a dedicated task via taskset, see:
https://forums.developer.nvidia.com/t/cannot-enable-denver-cores-for-tx2-jetpack-4-4-dp/124708/40

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If you are using a TX2, the links provided by @Linuxdev would explain this.

If you’re seeing that on Nano, but sure to only consider in lshw output the CPUs with product: cpu.
You may also check sysfs:

ls -l /sys/devices/system/cpu/
cat /sys/devices/system/cpu/online
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