lib25519-speed(1)

  NAME

lib25519-speed - run some lib25519 speed tests

  SYNOPSIS

    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:

    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.

  SEE ALSO

x25519(1), ed25519(1), lib25519(3)