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Git benchmark for file system aging

How it works:

The benchmarks ages a destination file system by performing git pulls from a source git repository. After a fixed number of pulls, the benchmark runs a provided script.

How to measure aging in ext4:

  1. Clone a repository to path_to_src_repo
  2. Initialize a filesystem at path_to_dest
  3. Run python path_to_src_repo path_to_dest output.txt total_pulls pulls_per_test ./ path_to_dest dest_blkdev path_to_unaged unaged_blkdev (must be root)
  4. Read results from output.txt

If the file system is mounted at /mnt/aged on block device /dev/sda1, the unaged version will be created at /mnt/unaged on /dev/sda2, and we want to perform a grep test every 100 pulls for 10,000 total pulls from a local clone of the linux kernel repository, we run:

python linux /mnt/aged output.txt 10000 100 ./ /mnt/aged /dev/sda1 /mnt/unaged /dev/sda2

How to run a different test:

The benchmark takes a program to execute together with arbitrary parameters, so any bash script or other executable can be provided and that will be run instead of the grep test.