Peder Bergan
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pederbe.dev
Peder Bergan
@pederbe.dev
24 followers 58 following 28 posts
Software engineer working with Rust and full-stack development. Contributing to open source and sharing what I build and learn.

https://pederbe.dev
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pederbe.dev
Readable help. Plain pipeline data.

Fastmash styles help, readable table-health reports and failure prefixes. Calculation output and health TSV stay plain, even with --color=always.

Controls: fastmash.io/guide/termin...
October 8, 2026 at 7:52 PM
pederbe.dev
A million decimals: sum + mean.

Fastmash: 122.5 ms. GNU datamash 1.9: 324.7 ms. 2.7x the speed on an Intel Linux laptop, with matching output.

Full results, including slower jobs, and a kit for your own data:
fastmash.io/benchmarks/
Fastmash: Same data. Less waiting. 4.2 times as fast as GNU datamash on RefGene quartiles, taking 26.6 ms versus 112.8 ms on the Intel laptop. Horizontal bars highlight five selected core benchmarks on an Intel laptop and an AMD desktop, both running native Linux. Laptop / desktop speed ratios: RefGene quartiles 4.2x / 3.8x; exon statistics per gene 1.9x / 1.7x; sum and mean of a million decimals 2.7x / 2.3x; grouped decimals, 100,000 rows, 1.8x / 1.7x; many small groups in synthetic data, 1.5x / 1.4x. Fastmash v0.1.0. fastmash.io/benchmarks/.
October 7, 2026 at 7:29 PM
pederbe.dev
I've released Fastmash: datamash commands for text and quoted CSV, plus weighted means, top records, table checks and dataset comparison.

RefGene quartiles: 4.2x GNU datamash 1.9's speed on an Intel Linux laptop.

Linux x86-64 + WSL2. Try your data: fastmash.io
Fastmash: Same data. Less waiting. 4.2 times as fast as GNU datamash on RefGene quartiles, taking 26.6 ms versus 112.8 ms on the Intel laptop. Horizontal bars highlight five selected core benchmarks on an Intel laptop and an AMD desktop, both running native Linux. Laptop / desktop speed ratios: RefGene quartiles 4.2x / 3.8x; exon statistics per gene 1.9x / 1.7x; sum and mean of a million decimals 2.7x / 2.3x; grouped decimals, 100,000 rows, 1.8x / 1.7x; many small groups in synthetic data, 1.5x / 1.4x. Fastmash v0.1.0. fastmash.io/benchmarks/.
October 7, 2026 at 10:59 AM
pederbe.dev
I proposed a fix for fnm, the Node version manager: automatic version switching on cd can fall back to the setup executable when fnm isn't found in Bash, Zsh, Fish or PowerShell. Shell wrappers still take priority.

github.com/Schniz/fnm/p...
#Rust #OpenSource #CLI
fnm hook: after changing directory, use the shell's fnm command if available; otherwise use the setup executable. Applies to Bash, Zsh, Fish and PowerShell.
September 25, 2026 at 6:11 PM