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Add BtrFS benchmarks

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Nick Terrell
2017-04-11 12:40:53 -07:00
parent b4dd3378f1
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contrib/linux-kernel/README.md
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@@ -24,3 +24,29 @@ The patches are based off of the linux kernel master branch (version 4.10).
* Additionally `fs/btrfs/zstd.c` is provided as a source for convenience.
* The patch seems to be working, it doesn't crash the kernel, and compresses at speeds and ratios athat are expected.
It can still use some more testing for fringe features, like printing options.
### Benchmarks
Benchmarks run on a Ubuntu 14.04 with 2 cores and 4 GiB of RAM.
The VM is running on a Macbook Pro with a 3.1 GHz Intel Core i7 processor,
16 GB of ram, and a SSD.
The compression benchmark is copying 10 copies of the
unzipped [silesia corpus](http://mattmahoney.net/dc/silesia.html) into a BtrFS
filesystem mounted with `-o compress-force={none, lzo, zlib, zstd}`.
The decompression benchmark is timing how long it takes to `tar` all 10 copies
into `/dev/null`.
The compression ratio is measured by comparing the output of `df` and `du`.
See `btrfs-benchmark.sh` for details.
| Algorithm | Compression ratio | Compression speed | Decompression speed |
|-----------|-------------------|-------------------|---------------------|
| None | 0.99 | 504 MB/s | 686 MB/s |
| lzo | 1.66 | 398 MB/s | 442 MB/s |
| zlib | 2.58 | 65 MB/s | 241 MB/s |
| zstd 1 | 2.57 | 260 MB/s | 383 MB/s |
| zstd 3 | 2.71 | 174 MB/s | 408 MB/s |
| zstd 6 | 2.87 | 70 MB/s | 398 MB/s |
| zstd 9 | 2.92 | 43 MB/s | 406 MB/s |
| zstd 12 | 2.93 | 21 MB/s | 408 MB/s |
| zstd 15 | 3.01 | 11 MB/s | 354 MB/s |