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[Deprecation] Properly migrate from M5 instances to M7a/M8a instances #6163

@peterzhuamazon

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@peterzhuamazon

As part of #6094 we have seen great performance increase on the M7a instances.

The current builds are mainly running on m5 instances: https://aws.amazon.com/ec2/instance-types/m5/

The M5 and M5d instances feature either the 1st or 2nd generation Intel Xeon Platinum 8000 series processor (Skylake-SP or Cascade Lake) with a sustained all core Turbo CPU clock speed of up to 3.1 GHz. Additionally there is support for the new Intel Advanced Vector Extensions 512 (AVX-512) instruction set, offering up to 2x the FLOPS per core compared to the previous generation M4 instances.

The m7a and potentially m8a instance running with:
https://aws.amazon.com/ec2/instance-types/m7a/ 3.7ghz
https://aws.amazon.com/ec2/instance-types/m8a/ 4.5ghz

We should definitely try out m7a, and potentially m8a depending on how ec2plugin on Jenkins support it.
jenkinsci/ec2-plugin#2009

Thanks.

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