tmpfs for OS X - https://github.com/Roman2K/bin/blob/master/mount-tmp

mount-tmp.sh

#!/usr/bin/env bash

size=1024 # MB
mount_point=$HOME/tmp
name=$(basename "$mount_point")

usage() {
  echo "usage: $(basename "$0") [mount | umount | remount | check | orphan]" \
    "(default: mount)" >&2
}

process_argv() {
  [ $# -ge 0 -a $# -le 1 ] || { usage; exit 1; }
  case "$1" in
    "")         cmd_mount ;;
    "mount")    cmd_mount ;;
    "umount")   cmd_umount ;;
    "remount")  cmd_remount ;;
    "check")    cmd_check ;;
    "orphan")   cmd_orphan ;;
    *)          usage ;;
  esac
}

cmd_check() {
  is_mounted
}

cmd_mount() {
  if is_mounted; then
    echo "Already mounted at $mount_point" >&2
    return 1
  fi

  sectors=$(( $size * 1024 * 1024 / 512 ))
  dev=$(hdiutil attach -nomount ram://$sectors) \
    && newfs_hfs -v "$name" $dev \
    && mount -t hfs -o nobrowse $dev "$mount_point" \
    && echo "Hello, world!" > "$mount_point"/hello_world \
    && echo "Mounted $name ($size MB) at $mount_point"
}

cmd_umount() {
  dev=$(df "$mount_point" | tail -1 | awk '{ print $1 }')
  [ $dev ] || return 1
  umount "$mount_point" && hdiutil detach "$dev"
}

cmd_remount() {
  if is_mounted; then cmd_umount else true; fi \
    && cmd_mount
}

cmd_orphan() {
  hdiutil info | egrep 'image-path\s+: ram://' -A14 | egrep '^/dev/disk\d+\s*$'
  return 0
}

is_mounted() {
  mount | grep -q " on $mount_point "
}

process_argv "$@"

инструкция.md

Mounting a RAMFS disk at boot in Mac OS X По ссылке инструкция создания tmpfs устарела, потому берем только загрузочный скрипт.

• Open Terminal (Applications -> Utilities), type “sudo su” and enter your user’s password.
• Create a new file in /Library/LaunchDaemons, like this: “nano -w /Library/LaunchDaemons/com.yeri.ramfs.plist” (you can rename yeri to whatever you like)
• And insert following content (ctrl+x to save – y – [enter]):

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" 
"http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
    <dict>
        <key>Label</key>
        <string>com.yeri.ramfs</string>
        <key>ProgramArguments</key>
        <array>
            <string>/var/root/ramfs.sh</string>
        </array>
        <key>RunAtLoad</key>
        <true/>
    </dict>
</plist>

• create a second file in /var/root/, like this: “nano -w /var/root/ramfs.sh“ And insert following content: (можно пропустил - устарело)

#!/bin/bash
ramfs_size_mb=64
mount_point=/private/tmp

ramfs_size_sectors=$((${ramfs_size_mb}*1024*1024/512))
ramdisk_dev=`hdid -nomount ram://${ramfs_size_sectors}`
newfs_hfs -v 'Volatile HD' ${ramdisk_dev}
mkdir -p ${mount_point}
mount -o noatime -t hfs ${ramdisk_dev} ${mount_point}
chown root:wheel ${mount_point}
chmod 1777 ${mount_point}

• chmod +x ramfs.sh and reboot (не забываем перекреститься/постучать по дереву или в бубен). Check in Terminal with “mount” or “df -h” is everything is fine. To hide the disk icon on your desktop, check my old blog post.
• In case Mac didn’t do so already, you might want to link /tmp to /private/tmp: “rm -r /tmp && ln -s /private/tmp /tmp“. Should be it !