Klaus Post
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Klaus Post
@klauspost.com
140 followers 48 following 79 posts
Making Go stuff go brrrrrrrrrrrrrrrrrrr
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klauspost.com
Compression library for #golang v1.18.2 released. If you are running v1.18.1 (specifically) please upgrade.
December 1, 2025 at 1:30 PM
klauspost.com
Now even more #golang msgp codegen in v1.5.0. Now with generics. Generates code 1000x faster than your LLM! :D

Give it a spin: github.com/tinylib/msgp...
October 27, 2025 at 3:14 PM
klauspost.com
Released v1.18.1 of the #golang compression library. You know what to do! Link as always github.com/klauspost/co...
October 23, 2025 at 4:32 PM
klauspost.com
Un-archived github.com/klauspost/cr... repo after getting a bit more than 2x on IEEE CRC32 using AVX512. Will submit upstream to #golang, but if you want to test it out early check out the repo.
Benchmark of IEEE CRC32.
July 22, 2025 at 9:53 AM
klauspost.com
New #golang cpuid release. As always github.com/klauspost/cp...
July 14, 2025 at 8:49 AM
klauspost.com
🙄 #golang
June 19, 2025 at 2:49 PM
klauspost.com
This kinda implies that it is all 32 bit systems?
June 3, 2025 at 2:40 PM
klauspost.com
most are more like this....
May 17, 2025 at 9:28 AM
klauspost.com
Would a #golang MinLZ compressor level with a better "worst case" speed be useful? Overly dramatic example...
May 17, 2025 at 9:27 AM
klauspost.com
Realizing I needed to add a mutex to protect an RNG call, I almost ended up with this.... Need more coffee 🫘
May 15, 2025 at 2:37 PM
klauspost.com
Sent in in. Now I can only 🤞
May 2, 2025 at 1:32 PM
klauspost.com
Now @klauspost.com - wish that my old profile link would redirect to my new one, though. @bsky.app
April 22, 2025 at 2:40 PM
klauspost.com
cmp.Or is so neat for error handling in #golang - just remember that *all* params are evaluated in order, and first error is returned.
// serialize serializes p as json. func (p *someThing) serialize() ([]byte, error) { var dst bytes.Buffer comp := minlz.NewWriter(&dst) err := cmp.Or(json.NewEncoder(comp).Encode(p), comp.Close()) return dst.Bytes(), err }
April 16, 2025 at 10:17 AM
klauspost.com
We need jungle, i'm afraid
April 8, 2025 at 12:15 PM
klauspost.com
Great feedback! I presume you are thinking of this. Right is better compression, so Snappy is worst here.

Snappy doesn't have concurrent stream compression, so it falls behind in speed there. TBH it doesn't have too much relevance other than wide compatibility.
March 18, 2025 at 7:17 PM
klauspost.com
New #golang compression package release. Mainly focused on non-assembly performance. Now uses "unsafe" - use "nounsafe" tag to disable.

As always here: github.com/klauspost/co...
changelog for package: Add unsafe little endian loaders #1036 fix: check r.err != nil but return a nil value error err by @alingse in #1028 flate: Simplify L4-6 loading #1043 flate: Simplify matchlen (remove asm) #1045 s2: Improve small block compression speed w/o asm #1048 flate: Fix matchlen L5+L6 #1049 flate: Cleanup & reduce casts #1050
February 19, 2025 at 2:36 PM
klauspost.com
Average shopping experience on @bandcamp.com
February 7, 2025 at 11:35 AM
klauspost.com
😜
February 7, 2025 at 11:24 AM
klauspost.com
Still tweaking...
January 22, 2025 at 2:43 PM
klauspost.com
Teaser for next year :)
IT IS DONE! :tada: I think the package is now ready for release. Spec is finalized, and implementations are done. The only thing we really need is benchmarking on some beefier HW than my home box. There are some graphs below that shows it compared to our current compression (and Snappy, LZ4 and my Level 5 deflate), and in the overall tests there are no significant regressions. Horizontal is compression ratio. Vertically compression speed, 16 core CPU. Next step would be pushing to a repo and make a blog post and do the benchmarks. This will be a solid improvement to on-disk compression, and it provides easy backwards compatibility.
December 28, 2024 at 5:25 PM
klauspost.com
Double negative... Most intuitive example... I *guess* this means `if (s3:if-none-match == null) == false`
"Condition": { "Null": { "s3:if-none-match": "false" } }
November 26, 2024 at 5:58 PM
klauspost.com
At least I am reasonably good at taking weekends off ;)
November 25, 2024 at 5:43 PM
klauspost.com
Love how javascript games are basically open source (ok, "source available" for the zealots). Let me just add some more coins.....
November 18, 2024 at 9:55 AM
klauspost.com
LOL - ChatGPT... How many mistakes can you spot ;)
November 14, 2024 at 6:33 PM
klauspost.com
This issue feels like a #golang job interview.. So I made it one :D

Here if you want a serious challenge (less allocs = better): go.dev/play/p/M-O6r...
type foo struct { cond sync.Cond mu sync.Mutex } // wait returns true when f.cond is triggered, // and false if it waited longer than provided timeout. // When returning, f.mu must always be locked. func (f *foo) wait(timeout time.Duration) (ok bool) { // ... }
November 14, 2024 at 6:15 PM