nixpkgs/nixos/tests/zram-generator.nix

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import ./make-test-python.nix {
name = "zram-generator";
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nodes.machine = { ... }: {
zramSwap = {
enable = true;
priority = 10;
algorithm = "lz4";
swapDevices = 2;
memoryPercent = 30;
memoryMax = 10 * 1024 * 1024;
};
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};
testScript = ''
machine.wait_for_unit("systemd-zram-setup@zram0.service")
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machine.wait_for_unit("systemd-zram-setup@zram1.service")
zram = machine.succeed("zramctl --noheadings --raw")
swap = machine.succeed("swapon --show --noheadings")
for i in range(2):
assert f"/dev/zram{i} lz4 10M" in zram
assert f"/dev/zram{i} partition 10M" in swap
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'';
}