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adjust OPTIMISATION.txt for current stuff

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cathugger 2020-07-18 16:18:24 +03:00
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33
OPTIMISATION.txt
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@ -1,26 +1,25 @@
This document describes configuration options which may help one to generate onions faster.
First of all, default configuration options are tuned for portability, not performance.
First of all, default configuration options are tuned for portability, and may be a bit suboptimal.
User is expected to pick optimal settings depending on hardware mkp224o will run on and ammount of filters.
ED25519 implementations:
mkp224o includes multiple implementations of ed25519 code, tuned for different processors.
Default is ref10 implementation from SUPERCOP, which is suboptimal in many cases.
Implementation is selected at configuration time, when running `./configure` script.
If one already configured/compiled code and wants to change options, just re-run
`./configure` and also run `make clean` to clear compiled files, if any.
Note that options and CFLAGS/LDFLAGS settings won't carry over from previous configure run,
so you have to include options you've previously configured, if you want them to remain.
At the time of writing, these implementations are present:
+----------------+-----------------------+-------------------------------------------------+
| implementation | enable flag | notes |
|----------------+-----------------------+-------------------------------------------------+
| ref10 | --enable-ref10 | SUPERCOP' ref10, pure C, very portable, default |
| amd64-51-30k | --enable-amd64-51-30k | SUPERCOP' amd64-51-30k, amd64 assembler, |
| | | only works in x86_64 architecture |
| amd64-64-24k | --enable-amd64-64-24k | SUPERCOP' amd64-64-24k, amd64 assembler, |
| | | only works in x86_64 architecture |
| ed25519-donna | --enable-donna | portable, based on amd64-51-30k, but C, not asm |
| ed25519-donna | --enable-donna-sse2 | uses SSE2, needs x86 architecture |
+----------------+-----------------------+-------------------------------------------------+
+----------------+-----------------------+----------------------------------------------------------+
| implementation | enable flag | notes |
|----------------+-----------------------+----------------------------------------------------------+
| ref10 | --enable-ref10 | SUPERCOP' ref10, pure C, very portable, previous default |
| amd64-51-30k | --enable-amd64-51-30k | SUPERCOP' amd64-51-30k, only works on x86_64 |
| amd64-64-24k | --enable-amd64-64-24k | SUPERCOP' amd64-64-24k, only works on x86_64 |
| ed25519-donna | --enable-donna | based on amd64-51-30k, C, portable, current default |
| ed25519-donna | --enable-donna-sse2 | uses SSE2, needs x86 architecture |
+----------------+-----------------------+----------------------------------------------------------+
When to use what:
- on 32-bit x86 architecture "--enable-donna" will probably be fastest, but one should try
using "--enable-donna-sse2" too
@ -91,6 +90,14 @@ Current options, at the time of writing:
and have some random filters which may have different length.
Batch mode:
mkp224o now includes experimental key generation mode which performs certain operations in batches,
and is around 15 times faster than current default.
It is currently experimental, and is activated by -B run-time flag.
Batched element count is configured by --enable-batchnum=number option at configure time,
increasing or decreasing it may make batch mode faster or slower, depending on hardware.
Benchmarking:
It's always good idea to see if your settings give you desired effect.
There currently isn't any automated way to benchmark different configuration options, but it's pretty simple to do by hand.