Mic92

parallel_map() {
    local func="$1"

    local num_cores
    num_cores=$(nproc 2>/dev/null || echo 4)
    local pipe_buf_size
    pipe_buf_size=$(getconf PIPE_BUF / 2>/dev/null || echo 4096)
    local tmpdir
    tmpdir=$(mktemp -d)
    trap 'rm -rf "$tmpdir"' EXIT

Mic92

From 3ceb739b696ac712dddfc6acf1f88e492d6f07d3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=B6rg=20Thalheim?= <joerg@thalheim.io>
Date: Sat, 20 Jul 2024 10:23:57 +0200
Subject: [PATCH] detect systemd by name rather than relying on
 SYSTEMD_BINARY_PATH
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

This allows us in NixOS to run systemd binaries from the nix store

Mic92

#!/bin/bash

set -eux -o pipefail

# Create mount point if it doesn't exist
mkdir -p /run/testmount

# Clean up on exit
trap 'umount /run/testmount; rmdir /run/testmount' EXIT

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{ pkgs, config, ... }:
{
  nixpkgs.config.allowUnfree = true;
  nixpkgs.config.nvidia.acceptLicense = true;
  # enable the nvidia driver
  services.xserver.videoDrivers = [ "nvidia" ];
  hardware.opengl.enable = true;
  hardware.nvidia.datacenter.enable = true;
  hardware.nvidia.package = config.boot.kernelPackages.nvidiaPackages.dc_535;

Mic92

hyperfine --show-output 'rm -R ~/.cache/nix/binary-cache-*.sqlite*; rm -rf /tmp/cache; nix copy --from "{url}" --to "file:///tmp/cache?compression=none" /nix/store/jlkypcf54nrh4n6r0l62ryx93z752hb2-firefox-132.0' -L url https://nixos.tvix.store,https://cache.nixos.org/
Benchmark 1: rm -R ~/.cache/nix/binary-cache-*.sqlite*; rm -rf /tmp/cache; nix copy --from "https://nixos.tvix.store" --to "file:///tmp/cache?compression=none" /nix/store/jlkypcf54nrh4n6r0l62ryx93z752hb2-firefox-132.0
  Time (mean ± σ):      5.090 s ±  0.113 s    [User: 4.721 s, System: 2.555 s]
  Range (min … max):    4.942 s …  5.332 s    10 runs

Benchmark 2: rm -R ~/.cache/nix/binary-cache-*.sqlite*; rm -rf /tmp/cache; nix copy --from "https://cache.nixos.org/" --to "file:///tmp/cache?compression=none" /nix/store/jlkypcf54nrh4n6r0l62ryx93z752hb2-firefox-132.0
  Time (mean ± σ):      6.729 s ±  0.148 s    [User: 15.829 s, System: 2.904 s]
  Range (min … max):    6.560 s …  7.049 s    10 runs

Mic92

diff --git a/nixos/modules/system/etc/build-composefs-dump.py b/nixos/modules/system/etc/build-composefs-dump.py
index fe739a621ec4..42287ea35842 100644
--- a/nixos/modules/system/etc/build-composefs-dump.py
+++ b/nixos/modules/system/etc/build-composefs-dump.py
@@ -1,5 +1,3 @@
-#!/usr/bin/env python3
-
 """Build a composefs dump from a Json config
 
 See the man page of composefs-dump for details about the format:

Mic92

// This code was autogenerated with `dbus-codegen-rust `, see https://github.com/diwic/dbus-rs
use dbus as dbus;
#[allow(unused_imports)]
use dbus::arg;
use dbus::blocking;

pub trait OrgFreedesktopDBusPeer {
    fn ping(&self) -> Result<(), dbus::Error>;
    fn get_machine_id(&self) -> Result<String, dbus::Error>;
}

Mic92

{ config, lib, pkgs, modulesPath, ... }:

{ imports =
    [ ./hardware-configuration.nix
      <nixpkgs/nixos/modules/testing/test-instrumentation.nix>
    ];

  networking.hostName = "thatworked";

  documentation.enable = false;

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package main

import (
	"encoding/json"
	"fmt"
	"go/ast"
	"go/parser"
	"go/token"
	"log"
	"os"

Mic92

#!/usr/bin/env bash
set -xeuo pipefail

SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"

# shellcheck disable=SC1090
source "$SCRIPT_DIR/env.sh"
: "${host:?}"
: "${ssh_user:=root}"