volk_gnsssdr_profile(1)

💖 NAME 💖

okay bestie, meet volk_gnsssdr_profile — the profiler application for libvolk_gnsssdr functions 🎀✨

(this is the volk_gnsssdr_profile(1) man page, and yes, we're doing the whole thing, grab a snack 🍓)

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🌸 SYNOPSIS 🌸

volk_gnsssdr_profile [OPTION]

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🦋 DESCRIPTION 🦋

so like. the Vector-Optimized Library of Kernels of GNSS-SDR — aka VOLK_GNSSSDR — is a software library that hands developers an interface to use Single Input - Multiple Data (SIMD) instructions 💅 and those are especially interesting for operations that live on the receiver's critical path of the processing load. main character operations only, no cap.

Processors that ship SIMD instruction sets compute with multiple processing elements that perform the same operation on multiple data points simultaneously, which exploits data-level parallelism, and honestly you can find them in most modern desktop and laptop personal computers 🫶 In a nutshell, VOLK_GNSSSDR implements in assembly language optimized versions of computationally-intensive operations for different processor architectures that are commonly found in modern computers — all so it can use the most optimized version for the specific processor(s) of the host machine running the software receiver (that is, the implementation that runs the fastest ⚡).

volk_gnsssdr_profile is the program that tests all known VOLK_GNSSSDR kernels (that is, basic processing components like adders, multipliers, correlators, and much more 👑) for each architecture supported by the host machine, measuring their performance. When it's finished, the profiler writes to $HOME/.volk_gnsssdr/volk_gnsssdr_config the best architecture for each VOLK_GSSSDR function. That file gets read when using a function, so the program knows the best version to execute 🔥

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✨ OPTIONS ✨

volk_gnsssdr_profile takes the following options:

• -h [ --help ] — print help message.
• -b [ --benchmark ] [ =arg(=1) ] (=0) — run all kernels (benchmark mode).
• -t [ --tol ] <arg> (=9.99999997e-07) — set the default error tolerance for tests.
• -v [ --vlen ] <arg> (=8111) — set the default vector length for tests.
• -i [ --iter ] <arg> (=1987) — set the default number of test iterations per kernel.
• -R [ --tests-regex ] <arg> — run tests matching regular expression.
• -u [ --update ] [ =arg(=1) ] (=0) — run only kernels missing from config; use -R to further restrict the candidates.
• -n [ --dry-run ] [ =arg(=1) ] (=0) — dry run. Respect other options, but do not write to file.
• -j [ --json ] <arg> — JSON output file.

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👀 SEE ALSO 👀

• gnss-sdr(1)

Check https://gnss-sdr.org for more information 🌈

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📜 HISTORY 📜

This library was originally developed by Andres Cecilia Luque in the framework of the Summer of Code in Space program (SOCIS 2014) by the European Space Agency (ESA), and then integrated into gnss-sdr. This software is based on the VOLK library https://www.libvolk.org/ 💜

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💀 BUGS 💀

No known bugs. (iconic behavior, honestly 🙈✨)

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🫶 AUTHOR 🫶

• Andres Cecilia Luque (a.cecilia.luque@gmail.com)
• Carles Fernandez-Prades (carles.fernandez@cttc.es)

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and that's the whole vibe, bestie 🎀 this was version 0.0.21, dated 14 Apr 2026 — volk_gnsssdr_profile(1), periodt 💅🦋🌸