| Filesystem | Time | Size |
|---|---|---|
| SquashFS | 5m53.945s | 17G |
| EroFS | 5m26.367s | 41G |
| EroFS (lz4hc) | - | dnf |
$ du -hd1 /nix
24G /nix/store
67M /nix/var
24G /nix
OS: NixOS 23.11pre530560.f5892ddac112 (Tapir) x86_64
Host: ASRockRack X570D4U
Kernel: 6.1.54
CPU: AMD Ryzen 9 5950X (32) @ 3.400GHz
Memory: 2x Micron 16ATF2G64AZ-3G2J1 3200 MT/s
21970MiB / 32029MiB
Disk model: Samsung SSD 970 EVO Plus 1TB
(CPU configured at low power limit; likely not representative for a normal R95950X system)
$ time sudo mksquashfs /nix nix.sqfs
Parallel mksquashfs: Using 32 processors
Creating 4.0 filesystem on nix.sqfs, block size 131072.
[============================================================================-] 817230/817230 100%
Exportable Squashfs 4.0 filesystem, gzip compressed, data block size 131072
compressed data, compressed metadata, compressed fragments,
compressed xattrs, compressed ids
4k unaligned
duplicates are removed
Filesystem size 17110252.61 Kbytes (16709.23 Mbytes)
40.25% of uncompressed filesystem size (42508165.84 Kbytes)
Inode table size 9092367 bytes (8879.26 Kbytes)
26.79% of uncompressed inode table size (33943495 bytes)
Directory table size 15175557 bytes (14819.88 Kbytes)
48.68% of uncompressed directory table size (31174531 bytes)
[Number of duplicate files found 262721
Number of inodes 800743
Number of files 529839
Number of fragments 21099
Number of symbolic links 75423
Number of device nodes 0
Number of fifo nodes 0
Number of socket nodes 2
Number of directories 195479
Number of hard-links 170798
Number of ids (unique uids + gids) 4
[...]
real 5m53.945s
user 0m0.010s
sys 0m0.047s
$ ls -lh nix.sqfs
-rw-r--r-- 1 root root 17G Oct 3 14:09 nix.sqfs
$ time sudo mkfs.erofs nix.erofs /nix
mkfs.erofs 1.7
Build completed.
------
Filesystem UUID: aa4e57f6-c23b-4518-979c-17450c1b2d5c
Filesystem total blocks: 10635822 (of 4096-byte blocks)
Filesystem total inodes: 800743
Filesystem total metadata blocks: 215571
Filesystem total deduplicated bytes (of source files): 0
real 5m26.367s
user 0m2.048s
sys 0m7.193s
$ ls -lh nix.erofs
-rw-r--r-- 1 root root 41G Oct 3 14:17 nix.erofs
$ time sudo mkfs.erofs -zlz4hc nix.erofs /nix
mkfs.erofs 1.7
Processing store/.links/1rxvlg6i8ww1vx074ydn4ynlw5zdihlacmjvv5x294qsj5c7xj23 ...^C
real 22m44.699s
user 0m0.394s
sys 0m1.248s
(>10min is too long imo)
Baseline / "basic" options for erofs not suitable for my interests. Likely going through the (many) tuneables could achieve much better, however image creation speed doesn't seem to be a particular focus.