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Divide the libxc build parallelism by 3 instead of 2 - #337

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HaoZeke:libxc-parallelism-divide-by-3-v2
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EESSI:mainfrom
HaoZeke:libxc-parallelism-divide-by-3-v2

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@HaoZeke

@HaoZeke HaoZeke commented Nov 2, 2026

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Companion to EESSI/software-layer#1772.

The libxc 7.0.0 build for x86_64/amd/zen4 there was killed twice by the out-of-memory killer in cc1 at half the cores.
A divider of 3 gives 5 jobs on a 16-core build node instead of 8.

AI disclosure: an AI coding assistant helped write this change.
I reviewed it and checked the builds and tests myself.

The libxc 7.0.0 build for x86_64/amd/zen4 in EESSI/software-layer#1772
was killed twice with the same OOM in cc1 at half the cores.
A divider of 3 gives 5 jobs on a 16-core build node instead of 8.
@casparvl

casparvl commented Nov 2, 2026

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Testing this in EESSI/software-layer#1772 (comment)

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