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      1 # !/bin/sh
      2 set -e
      3 
      4 # Benchmarks run on a Ubuntu 14.04 VM with 2 cores and 4 GiB of RAM.
      5 # The VM is running on a Macbook Pro with a 3.1 GHz Intel Core i7 processor and
      6 # 16 GB of RAM and an SSD.
      7 
      8 # $BENCHMARK_DIR is generated with the following commands, from the Ubuntu image
      9 # ubuntu-16.10-desktop-amd64.iso.
     10 # > mkdir mnt
     11 # > sudo mount -o loop ubuntu-16.10-desktop-amd64.iso mnt
     12 # > cp mnt/casper/filesystem.squashfs .
     13 # > sudo unsquashfs filesystem.squashfs
     14 
     15 # $HOME is on a ext4 filesystem
     16 BENCHMARK_DIR="$HOME/squashfs-root/"
     17 BENCHMARK_FS="$HOME/filesystem.squashfs"
     18 
     19 # Normalize the environment
     20 sudo rm -f $BENCHMARK_FS 2> /dev/null > /dev/null || true
     21 sudo umount /mnt/squashfs 2> /dev/null > /dev/null || true
     22 
     23 # Run the benchmark
     24 echo "Compression"
     25 echo "sudo mksquashfs $BENCHMARK_DIR $BENCHMARK_FS $@"
     26 time sudo mksquashfs $BENCHMARK_DIR $BENCHMARK_FS $@ 2> /dev/null > /dev/null
     27 
     28 echo "Approximate compression ratio"
     29 printf "%d / %d\n"                                                             \
     30   $(sudo du -sx --block-size=1 $BENCHMARK_DIR | cut -f1)                       \
     31   $(sudo du -sx --block-size=1 $BENCHMARK_FS  | cut -f1);
     32 
     33 # Mount the filesystem
     34 sudo mount -t squashfs $BENCHMARK_FS /mnt/squashfs
     35 
     36 echo "Decompression"
     37 time sudo tar -c /mnt/squashfs 2> /dev/null | wc -c > /dev/null
     38 
     39 sudo umount /mnt/squashfs
     40