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**Note: I never "published" these results and don't consider them accurate.** | ||
The overlay/overlay2 regression seemed strange to me, and I suspect it's due to | ||
something weird with the kernel I compiled. I re-did these tests in October 2017 while being careful with the kernel versions and settings, and the regression disappeared. | ||
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Below is the original text from the PR: | ||
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---------------- | ||
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This was run on a `c3.8xlarge` (32 cores, 60GB RAM, on instance storage in | ||
RAID0) with Docker 17.03.1-ce and kernel 4.9.33 (custom-built with the AUFS | ||
patches). | ||
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## results | ||
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overlay and overlay2 have a *huge* regression in file appending. i want to try | ||
this out on a stock kernel (just in case my custom-built one was built | ||
strangely), but if it happens there, this is definitely bug-worthy: | ||
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![append-to-small-files](https://i.fluffy.cc/Jr1KxbpXgVWWKvNJRC3P48Lg4knzwN6S.png) | ||
([compare to last time](https://i.fluffy.cc/GjjxQmVTtCH31ZR7PVpR9xMwhzQ8LBqK.png)) | ||
![append-to-file-tree](https://i.fluffy.cc/qL5swgqVD3FWNx7JJbGSh4sm25KdQsmZ.png) | ||
([compare to last time](https://i.fluffy.cc/gWtX0x4kFc2K6C5tvJfBkwJCpRMscHv1.png)) | ||
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aufs continues to significantly decrease performance even when reading a _mounted_ filesystem: | ||
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![read-file-tree-mounted](https://i.fluffy.cc/4tLLGwzRrsVhs2bD8CgtbqHwJJGvZhTf.png) | ||
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aufs is still slow at large file trees: | ||
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![read-file-tree](https://i.fluffy.cc/xNn8RwPVZsHGpGT9TG4dgR8PkbdPpqQr.png) | ||
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devicemapper (not tested last time) is good at most of these graphs, but has super slow reads? | ||
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![read-big-files](https://i.fluffy.cc/zhHBJc6njhqn2QhPd585Vtd0H3VBS7V7.png) | ||
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other graphs (not as interesting): | ||
* [append-to-big-files](https://i.fluffy.cc/f8dBH7F98NDcg1xXx46hZxcqMxLjHvQw.png) | ||
* [read-small-files](https://i.fluffy.cc/sZGvZSGqTBZm2Tnpz1c76P4GmTnDNjDX.png) |
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