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make-disk-image: use nocache for smaller memory footprint #1234

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make-disk-image: use nocache for smaller memory footprint #1234

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7 changes: 7 additions & 0 deletions lib/make-disk-image.nix
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Expand Up @@ -155,6 +155,13 @@ let
# systems, while -P 4 is ~30% slower. Cap at 8 but use fewer workers if the
# system has fewer cores.
mkdir -p "$rootMountPoint"/nix/store
# Limit dirty page accumulation to prevent OOM in the VM.
# The kernel evicts clean page cache under memory pressure, but dirty
# pages must be written back first. Low thresholds force early writeback
# so dirty pages never pile up enough to trigger the OOM killer,
# even when copying files larger than available RAM.
echo 10000000 > /proc/sys/vm/dirty_bytes
echo 5000000 > /proc/sys/vm/dirty_background_bytes
${
if cfg.copyNixStoreThreads == "auto" then
''
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