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siliconsocket/ramdisk.sh

Last active July 18, 2024 16:28
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Script to create a RAM disk (12 GB) to mount Xcode's derivedData for faster buildings
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ramdisk.sh
#!/bin/bash
gigabytes=12
capacity=$(($gigabytes * 2097152))
ramdisk=$(hdid -nomount ram://$capacity)
newfs_hfs -v DerivedData $ramdisk
diskutil mount -mountPoint ~/Library/Developer/Xcode/DerivedData $ramdisk
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siliconsocket commented Apr 8, 2021

  1. Save this script as ramdisk.sh (or name.sh, as you want) on your Mac
  2. open terminal and type command: sh ramdisk.sh to run it (inside directory that you saved it)
  3. open Xcode (Xcode must be opened AFTER you run this script)
  4. Build your app as usually (but 3x faster)

CAUTION: RAMdisk will be filled with derived data from your App's builds, so you need to destroy RAMdisk periodically if you receive a compilation error (close Xcode, then unmount RAMdisk from your desktop with right-click, then re-run this script and re-open Xcode Again).

Tested on Mac OS Big Sur

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