Peder Bergan
@pederbe.dev
Software engineer working with Rust and full-stack development. Contributing to open source and sharing what I build and learn.
https://pederbe.dev
https://pederbe.dev
Check a TSV before the next pipeline step.
Fastmash health reports uneven records, missing-value indicators and mixed types. Declare requirements and add validate to fail on violations; inferred findings stay advisory.
fastmash.io/guide/table-...
Fastmash health reports uneven records, missing-value indicators and mixed types. Declare requirements and add validate to fail on violations; inferred findings stay advisory.
fastmash.io/guide/table-...
October 12, 2026 at 4:36 PM
Check a TSV before the next pipeline step.
Fastmash health reports uneven records, missing-value indicators and mixed types. Declare requirements and add validate to fail on violations; inferred findings stay advisory.
fastmash.io/guide/table-...
Fastmash health reports uneven records, missing-value indicators and mixed types. Declare requirements and add validate to fail on violations; inferred findings stay advisory.
fastmash.io/guide/table-...
Keep the highest readings and the records they came from:
fastmash -H top:10 reading < measurements.tsv
Add -s -g site for a selection per site. Earlier input wins ties. Text and quoted CSV are supported.
fastmash.io/guide/top-n-...
fastmash -H top:10 reading < measurements.tsv
Add -s -g site for a selection per site. Earlier input wins ties. Text and quoted CSV are supported.
fastmash.io/guide/top-n-...
October 11, 2026 at 9:28 AM
Keep the highest readings and the records they came from:
fastmash -H top:10 reading < measurements.tsv
Add -s -g site for a selection per site. Earlier input wins ties. Text and quoted CSV are supported.
fastmash.io/guide/top-n-...
fastmash -H top:10 reading < measurements.tsv
Add -s -g site for a selection per site. Earlier input wins ties. Text and quoted CSV are supported.
fastmash.io/guide/top-n-...
Some readings count more than others.
fastmash -H wmean reading:weight < measurements.tsv
Weighted averages for text or quoted CSV, across a dataset or per group. Finite, nonnegative weights; positive retained total required.
fastmash.io/guide/weight...
fastmash -H wmean reading:weight < measurements.tsv
Weighted averages for text or quoted CSV, across a dataset or per group. Finite, nonnegative weights; positive retained total required.
fastmash.io/guide/weight...
October 10, 2026 at 3:42 PM
Some readings count more than others.
fastmash -H wmean reading:weight < measurements.tsv
Weighted averages for text or quoted CSV, across a dataset or per group. Finite, nonnegative weights; positive retained total required.
fastmash.io/guide/weight...
fastmash -H wmean reading:weight < measurements.tsv
Weighted averages for text or quoted CSV, across a dataset or per group. Finite, nonnegative weights; positive retained total required.
fastmash.io/guide/weight...
Which categories changed most?
Fastmash compare summarizes two datasets, aligns keys and ranks absolute or percentage changes. Added and removed keys stay visible. Named columns can move between the two headers.
fastmash.io/guide/datase...
Fastmash compare summarizes two datasets, aligns keys and ranks absolute or percentage changes. Added and removed keys stay visible. Named columns can move between the two headers.
fastmash.io/guide/datase...
October 9, 2026 at 7:27 PM
Which categories changed most?
Fastmash compare summarizes two datasets, aligns keys and ranks absolute or percentage changes. Added and removed keys stay visible. Named columns can move between the two headers.
fastmash.io/guide/datase...
Fastmash compare summarizes two datasets, aligns keys and ranks absolute or percentage changes. Added and removed keys stay visible. Named columns can move between the two headers.
fastmash.io/guide/datase...
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...
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
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...
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...
@thisweekinrust.bsky.social Would you be willing to take a look at my practical article on fast 80-bit arithmetic in Rust? I'd be really help if you can include it in an upcoming newsletter.
Fastmash ran a RefGene quartile job 4.2× as fast as GNU datamash on an Intel laptop. Same output.
I wrote about the Rust code, software 80-bit arithmetic and the lengths I went to for that last digit.
pederbe.dev/writing/fast...
#Rust
I wrote about the Rust code, software 80-bit arithmetic and the lengths I went to for that last digit.
pederbe.dev/writing/fast...
#Rust
Fast statistics and fussy arithmetic in Rust
How Fastmash shares work and certifies arithmetic fast paths to deliver fast statistics with reproducible 80-bit results in Rust.
pederbe.dev
October 8, 2026 at 11:29 AM
@thisweekinrust.bsky.social Would you be willing to take a look at my practical article on fast 80-bit arithmetic in Rust? I'd be really help if you can include it in an upcoming newsletter.
Fastmash ran a RefGene quartile job 4.2× as fast as GNU datamash on an Intel laptop. Same output.
I wrote about the Rust code, software 80-bit arithmetic and the lengths I went to for that last digit.
pederbe.dev/writing/fast...
#Rust
I wrote about the Rust code, software 80-bit arithmetic and the lengths I went to for that last digit.
pederbe.dev/writing/fast...
#Rust
Fast statistics and fussy arithmetic in Rust
How Fastmash shares work and certifies arithmetic fast paths to deliver fast statistics with reproducible 80-bit results in Rust.
pederbe.dev
October 8, 2026 at 11:26 AM
Fastmash ran a RefGene quartile job 4.2× as fast as GNU datamash on an Intel laptop. Same output.
I wrote about the Rust code, software 80-bit arithmetic and the lengths I went to for that last digit.
pederbe.dev/writing/fast...
#Rust
I wrote about the Rust code, software 80-bit arithmetic and the lengths I went to for that last digit.
pederbe.dev/writing/fast...
#Rust
Reposted by Peder Bergan
This week in #rust 672 https://this-week-in-rust.org/blog/2026/10/07/this-week-in-rust-672/ #rustlang
October 8, 2026 at 7:14 AM
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: 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/
October 7, 2026 at 7:29 PM
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: 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/
80% of developers use AI every single day. Wow! Interesting findings from StackOverflow's annual survey.
survey.stackoverflow.co/2026/ai
#programming #ai #dev
survey.stackoverflow.co/2026/ai
#programming #ai #dev
AI 2026 | Stack Overflow Developer Survey
How are technologists using AI?
survey.stackoverflow.co
October 7, 2026 at 1:28 PM
80% of developers use AI every single day. Wow! Interesting findings from StackOverflow's annual survey.
survey.stackoverflow.co/2026/ai
#programming #ai #dev
survey.stackoverflow.co/2026/ai
#programming #ai #dev
A result should travel with its data.
Fastmash uses 80-bit software arithmetic and built-in locales. Same Fastmash version, input and explicit settings: same results on supported machines.
Linux x86-64 + WSL2 today.
fastmash.io/adr/0003-por...
Fastmash uses 80-bit software arithmetic and built-in locales. Same Fastmash version, input and explicit settings: same results on supported machines.
Linux x86-64 + WSL2 today.
fastmash.io/adr/0003-por...
October 7, 2026 at 11:00 AM
A result should travel with its data.
Fastmash uses 80-bit software arithmetic and built-in locales. Same Fastmash version, input and explicit settings: same results on supported machines.
Linux x86-64 + WSL2 today.
fastmash.io/adr/0003-por...
Fastmash uses 80-bit software arithmetic and built-in locales. Same Fastmash version, input and explicit settings: same results on supported machines.
Linux x86-64 + WSL2 today.
fastmash.io/adr/0003-por...
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
RefGene quartiles: 4.2x GNU datamash 1.9's speed on an Intel Linux laptop.
Linux x86-64 + WSL2. Try your data: fastmash.io
October 7, 2026 at 10:59 AM
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
RefGene quartiles: 4.2x GNU datamash 1.9's speed on an Intel Linux laptop.
Linux x86-64 + WSL2. Try your data: fastmash.io
Arrow keys shouldn't wander behind an open menu. My proposed egui fix keeps arrow-key navigation within menus and their open submenus, so focus doesn't jump to controls behind them. github.com/emilk/egui/p... #Rust #OpenSource #Programming
Keep arrow-key navigation within open menus
Keep arrow-key focus inside open menus and their popup descendants.
github.com
September 25, 2026 at 7:27 PM
Arrow keys shouldn't wander behind an open menu. My proposed egui fix keeps arrow-key navigation within menus and their open submenus, so focus doesn't jump to controls behind them. github.com/emilk/egui/p... #Rust #OpenSource #Programming
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
github.com/Schniz/fnm/p...
#Rust #OpenSource #CLI
September 25, 2026 at 6:11 PM
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
github.com/Schniz/fnm/p...
#Rust #OpenSource #CLI
DeepTutor: I introduced a new feature named "Doctor". It helps model setup, credentials, storage, and retrieval backends. Simplifies the process, redacts sensitive values!
github.com/HKUDS/DeepTu...
#OpenSource #Python #Programming
github.com/HKUDS/DeepTu...
#OpenSource #Python #Programming
September 23, 2026 at 5:58 PM
DeepTutor: I introduced a new feature named "Doctor". It helps model setup, credentials, storage, and retrieval backends. Simplifies the process, redacts sensitive values!
github.com/HKUDS/DeepTu...
#OpenSource #Python #Programming
github.com/HKUDS/DeepTu...
#OpenSource #Python #Programming
Proposed in my zoxide PR: interactive Xonsh completion. This would let users choose a previously visited directory without typing its full path.
github.com/ajeetdsouza/...
#Rust #OpenSource #Programming
github.com/ajeetdsouza/...
#Rust #OpenSource #Programming
Interactive Xonsh completion in zoxide
Proposed interactive selection of previously visited directories in the Xonsh shell.
github.com
September 23, 2026 at 3:02 PM
Proposed in my zoxide PR: interactive Xonsh completion. This would let users choose a previously visited directory without typing its full path.
github.com/ajeetdsouza/...
#Rust #OpenSource #Programming
github.com/ajeetdsouza/...
#Rust #OpenSource #Programming
Reposted by Peder Bergan
Arguing about arguments
> Steve Klabnik, once against fancy Rust argument features from Ruby experience, now cautiously supports named parameters alone due to AI coding agents improving call-site clarity.
> Steve Klabnik, once against fancy Rust argument features from Ruby experience, now cautiously supports named parameters alone due to AI coding agents improving call-site clarity.
September 23, 2026 at 4:50 AM
Arguing about arguments
> Steve Klabnik, once against fancy Rust argument features from Ruby experience, now cautiously supports named parameters alone due to AI coding agents improving call-site clarity.
> Steve Klabnik, once against fancy Rust argument features from Ruby experience, now cautiously supports named parameters alone due to AI coding agents improving call-site clarity.
@rust-lang.org: Miri could put CI secrets in cached target/ data and expose them to PRs. Fixed in Sept 22 nightly. Check workflows, clear caches, rotate at-risk secrets.
blog.rust-lang.org/2026/09/21/g...
#Rust #OpenSource #Programming
blog.rust-lang.org/2026/09/21/g...
#Rust #OpenSource #Programming
September 23, 2026 at 7:54 AM
@rust-lang.org: Miri could put CI secrets in cached target/ data and expose them to PRs. Fixed in Sept 22 nightly. Check workflows, clear caches, rotate at-risk secrets.
blog.rust-lang.org/2026/09/21/g...
#Rust #OpenSource #Programming
blog.rust-lang.org/2026/09/21/g...
#Rust #OpenSource #Programming
Unix convention: a process killed by a signal exits as 128 plus the signal number. fnm exec currently reduces that case to 1.
My patch preserves the signal status, so scripts can distinguish it from an ordinary failure.
github.com/Schniz/fnm/p...
#Rust #OpenSource #Programming
My patch preserves the signal status, so scripts can distinguish it from an ordinary failure.
github.com/Schniz/fnm/p...
#Rust #OpenSource #Programming
September 20, 2026 at 2:00 PM
Unix convention: a process killed by a signal exits as 128 plus the signal number. fnm exec currently reduces that case to 1.
My patch preserves the signal status, so scripts can distinguish it from an ordinary failure.
github.com/Schniz/fnm/p...
#Rust #OpenSource #Programming
My patch preserves the signal status, so scripts can distinguish it from an ordinary failure.
github.com/Schniz/fnm/p...
#Rust #OpenSource #Programming
One leftover number can turn a short Helix macro into thousands of replays.
The fix I proposed resets unfinished counts after each outermost macro iteration, without breaking counts inside nested macros.
github.com/helix-editor...
#Rust #OpenSource #Programming
The fix I proposed resets unfinished counts after each outermost macro iteration, without breaking counts inside nested macros.
github.com/helix-editor...
#Rust #OpenSource #Programming
September 19, 2026 at 2:01 PM
One leftover number can turn a short Helix macro into thousands of replays.
The fix I proposed resets unfinished counts after each outermost macro iteration, without breaking counts inside nested macros.
github.com/helix-editor...
#Rust #OpenSource #Programming
The fix I proposed resets unfinished counts after each outermost macro iteration, without breaking counts inside nested macros.
github.com/helix-editor...
#Rust #OpenSource #Programming
pnpm update --global should be boring when nothing changed. Today it can replace the active group anyway.
I proposed keeping that group when resolution returns the same lockfile, while still handling pending build approvals.
github.com/pnpm/pnpm/pu...
#Rust #OpenSource #Programming
I proposed keeping that group when resolution returns the same lockfile, while still handling pending build approvals.
github.com/pnpm/pnpm/pu...
#Rust #OpenSource #Programming
September 18, 2026 at 2:01 PM
pnpm update --global should be boring when nothing changed. Today it can replace the active group anyway.
I proposed keeping that group when resolution returns the same lockfile, while still handling pending build approvals.
github.com/pnpm/pnpm/pu...
#Rust #OpenSource #Programming
I proposed keeping that group when resolution returns the same lockfile, while still handling pending build approvals.
github.com/pnpm/pnpm/pu...
#Rust #OpenSource #Programming
One missing newline shouldn't hide the edit.
My proposed Delta fix preserves within-line change highlighting across missing-newline markers, making the exact edit easier to review.
github.com/dandavison/d...
#Rust #OpenSource #Programming
My proposed Delta fix preserves within-line change highlighting across missing-newline markers, making the exact edit easier to review.
github.com/dandavison/d...
#Rust #OpenSource #Programming
Delta: preserve edit highlighting across missing-newline markers
Proposed fix: preserve within-line highlighting when a file lacks its final newline.
github.com
September 17, 2026 at 7:58 PM
One missing newline shouldn't hide the edit.
My proposed Delta fix preserves within-line change highlighting across missing-newline markers, making the exact edit easier to review.
github.com/dandavison/d...
#Rust #OpenSource #Programming
My proposed Delta fix preserves within-line change highlighting across missing-newline markers, making the exact edit easier to review.
github.com/dandavison/d...
#Rust #OpenSource #Programming
A jump label should be easy to spot.
My proposed Helix fix keeps jump-label colors from being overridden by document-link styling, so the navigation target stays visible.
github.com/helix-editor...
#Rust #OpenSource #Programming
My proposed Helix fix keeps jump-label colors from being overridden by document-link styling, so the navigation target stays visible.
github.com/helix-editor...
#Rust #OpenSource #Programming
Helix: jump-label colors over document links
Proposed fix: keep navigation labels visible over document links.
github.com
September 17, 2026 at 7:58 PM
A jump label should be easy to spot.
My proposed Helix fix keeps jump-label colors from being overridden by document-link styling, so the navigation target stays visible.
github.com/helix-editor...
#Rust #OpenSource #Programming
My proposed Helix fix keeps jump-label colors from being overridden by document-link styling, so the navigation target stays visible.
github.com/helix-editor...
#Rust #OpenSource #Programming
Which commit does that submodule point to?
My merged Jujutsu contribution lets custom templates show full object IDs, including submodule commit IDs. Useful when you need the exact revision.
github.com/jj-vcs/jj/pu...
#Rust #OpenSource #Programming
My merged Jujutsu contribution lets custom templates show full object IDs, including submodule commit IDs. Useful when you need the exact revision.
github.com/jj-vcs/jj/pu...
#Rust #OpenSource #Programming
Jujutsu: expose resolved tree values
Merged: custom templates can show full object IDs, including Git submodule commit IDs.
github.com
September 17, 2026 at 3:01 PM
Which commit does that submodule point to?
My merged Jujutsu contribution lets custom templates show full object IDs, including submodule commit IDs. Useful when you need the exact revision.
github.com/jj-vcs/jj/pu...
#Rust #OpenSource #Programming
My merged Jujutsu contribution lets custom templates show full object IDs, including submodule commit IDs. Useful when you need the exact revision.
github.com/jj-vcs/jj/pu...
#Rust #OpenSource #Programming
My Atuin PR was merged: command-history searches now support multiple exit-code filters. This makes it easier to find past commands by how they finished, such as finding failures while excluding specific error codes.
github.com/atuinsh/atui...
github.com/atuinsh/atui...
September 15, 2026 at 2:20 PM
My Atuin PR was merged: command-history searches now support multiple exit-code filters. This makes it easier to find past commands by how they finished, such as finding failures while excluding specific error codes.
github.com/atuinsh/atui...
github.com/atuinsh/atui...