Re: [OS-BUILD PATCHv5] redhat/kernel.spec.template: Parallelize compression

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From: Denys Vlasenko on gitlab.com
https://gitlab.com/cki-project/kernel-ark/-/merge_requests/2254#note_1249493515

We usually have 2000..4000 modules.
With e.g. -n 1000, you obviously risk having fewer "xz" processes than CPUs.
Even with -n 100, conceivably on a big machine, you can underutilize CPUs.
OTOH, -n 1, you can spend more time starting a new xz process than compressing
a module, if it's a small module.
So yes, -n16 is an arbitrary choice, but there is logic why it should be
somewhere in [10,100] range.
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