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From: "Robin H. Johnson" <robbat2@gentoo.org>
To: obnam-dev@obnam.org
Date: Sun, 19 Jun 2016 10:27:16 -0700
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Subject: [PATCH 0/1] encryption: boost GPG performance.
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The following patch (next in the thread), significently boosts the performance
of the encryption plugin by tuning the GPG symmetric parameters.
See the previous thread of 'GPG & performance' for the nuanced details about
why this works.
Running 'production.yaml' benchmarks using obnam-bench. This does use the
green-albatross repo format, but the patch is generic, and improves all
symmetric GPG usage.
Time in seconds.
many_files one_big_file
Unencrypted 225.4 10.2
GPG(master) 284.8 272.5
GPG(patch) 251.3 47.8
Yes, that's correct, for the big file case, it's 5.7x faster.
There is one case where this patch will have a NEGATIVE impact:
Usage of compress-with=None along with highly compressible input.
This is because GPG was previously compressing the data before encryption, and
faster specifically because it had less data to compress than with this patch.
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