lib25519-speed(1)
| lib25519-speed(1) | lib25519-speed(1) |
NAME
lib25519-speed - run some lib25519 speed tests
SYNOPSIS
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lib25519-speed
DESCRIPTION
lib25519-speed runs some tests of the speed of the lib25519 implementation of X25519 and Ed25519.
The lib25519-speed output format is subject to change. Examples of output lines with the current format, from a lib25519-speed run on an Intel Haswell CPU core, include the following:
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nG_merged25519 selected implementation amd64-mxaa-opt compiler clang -Wall -fPIC -fwrapv -Qunused-arguments -O2 -mmmx -msse -msse2 -msse3 -mssse3 -msse4.1 -msse4.2 -mavx -mbmi -mbmi2 -mavx2 -mtune=haswell; Ubuntu clang version 14.0.0-1ubuntu1.1; Target: x86_64-pc-linux-gnu; Thread model: posix; InstalledDir: /usr/bin nG_merged25519 selected 32 43276 +17556+272+38-60-200-13-109-24+139+118+3-24+39+37-86-221
These lines say that the automatically selected implementation for the nG_merged25519 subroutine was the amd64-mxaa-opt implementation compiled with the clang options shown, taking an interquartile mean (IQM) of 43276 CPU cycles. The numbers 43276 +17556+272+... show the timings for a series of consecutive operations: the IQM was 43276 cycles, the first run took 17556 cycles more than the IQM, the second run took 272 cycles more than the IQM, etc.