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Run per-host/per-package nix eval and dry-run build concurrently #35

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beatzaplenty merged 1 commits from worktree-parallel-host-eval into main 2026-07-22 02:05:59 +00:00
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beatzaplenty commented 2026-07-22 02:05:53 +00:00
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codex-maintenance.sh evaluated each affected host/package one at a time,
even though those calls are independent. Added scripts/lib/nix-parallel.sh
(run_nix_parallel) and wired it into the host-eval, package-eval, and
dry-run-build loops.

Concurrency defaults to core count capped by available memory (~1GB/job)
rather than plain nproc: empirically, nproc-many concurrent full-flake
evals OOM-killed each other on a 4GB/6-core box, while 3-4 ran clean and
were still ~2x faster than serial. Override via NIX_PARALLEL_JOBS.

Co-Authored-By: Claude Sonnet 5 noreply@anthropic.com

codex-maintenance.sh evaluated each affected host/package one at a time, even though those calls are independent. Added scripts/lib/nix-parallel.sh (run_nix_parallel) and wired it into the host-eval, package-eval, and dry-run-build loops. Concurrency defaults to core count capped by available memory (~1GB/job) rather than plain nproc: empirically, nproc-many concurrent full-flake evals OOM-killed each other on a 4GB/6-core box, while 3-4 ran clean and were still ~2x faster than serial. Override via NIX_PARALLEL_JOBS. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
beatzaplenty added 1 commit 2026-07-22 02:05:53 +00:00
Run per-host/per-package nix eval and dry-run build concurrently
Check NixOS configurations / eval-hosts (pull_request) Successful in 10m20s
Details
f237a6a3d2 
codex-maintenance.sh evaluated each affected host/package one at a time,
even though those calls are independent. Added scripts/lib/nix-parallel.sh
(run_nix_parallel) and wired it into the host-eval, package-eval, and
dry-run-build loops.

Concurrency defaults to core count capped by available memory (~1GB/job)
rather than plain nproc: empirically, nproc-many concurrent full-flake
evals OOM-killed each other on a 4GB/6-core box, while 3-4 ran clean and
were still ~2x faster than serial. Override via NIX_PARALLEL_JOBS.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
beatzaplenty merged commit 0f78e96b81 into main 2026-07-22 02:05:59 +00:00
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Reference: beatzaplenty/nixos#35