jerrinot: a few random things

[jerrinot]

Check List:

• [x] You have run ./mvnw verify and the project builds successfully

• [x] Tests pass (./test.sh <username> shows no differences between expected and actual outputs)

• [x] All formatting changes by the build are committed

• [x] Your launch script is named calculate_average_<username>.sh (make sure to match casing of your GH user name) and is executable

• [x] Output matches that of calculate_average_baseline.sh

• [x] For new entries, or after substantial changes: When implementing custom hash structures, please point to where you deal with hash collisions (line number)

• Execution time: 1.7s

• Execution time of reference implementation: looong

I wasn't planning any further changes after https://github.com/gunnarmorling/1brc/pull/690. But I couldn't resist trying at least something after @thomaswue sent this beauty: https://github.com/gunnarmorling/1brc/pull/702 This PR is not really introducing anything new, just optimizing existing codepaths. It yields a small improvement on my box, but it's hard to predict if this translates to performance improvements on THE box.

In any case: @gunnarmorling, massive Thank you for organising this challenge, I had a blast!

[gunnarmorling]

Very nice improvement! Thank you so much for the nice words and for particpating in 1BRC, @jerrinot! Congrats for creating one of the top entries, really cool to see all the amazing tricks you brought to the table.

Benchmark 1: timeout -v 300 ./calculate_average_jerrinot.sh 2>&1
  Time (mean ± σ):      1.609 s ±  0.012 s    [User: 0.003 s, System: 0.003 s]
  Range (min … max):    1.589 s …  1.633 s    10 runs

Summary
  jerrinot: trimmed mean 1.6081975965600002, raw times 1.58892183156,1.61404948556,1.61037620956,1.6329010565600002,1.61700875656,1.60569608156,1.60031932156,1.60174426556,1.6044052875600001,1.61198136456

Leaderboard

| # | Result (m:s.ms) | Implementation     | JDK | Submitter     | Notes     |
|---|-----------------|--------------------|-----|---------------|-----------|
|   | 00:01.608 | [link](https://github.com/gunnarmorling/1brc/blob/main/src/main/java/dev/morling/onebrc/CalculateAverage_jerrinot.java)| 21.0.2-graal | [Jaromir Hamala](https://github.com/jerrinot) | GraalVM native binary, uses Unsafe |

[jerrinot]

@gunnarmorling thank you so much for doing all this! with 550+ PR closed, most of you reviewed by you only. you put in way more effort than anyone else. thank you!

[gunnarmorling]

Hey @jerrinot!

Congrats again on being in the Top 3 of the One Billion Row Challenge!

To celebrate this amazing achievement, I would like to send you a 1BRC t-shirt and coffee mug. To claim your prize, fill out this form by Feb 18. After submitting the form, please provide a comment with the random value you've specified in the form, so that I know it is you who submitted it.

All data entered will solely be used in relation to processing this shipment. Shipments can be sent to any country listed here. A big thank you to Decodable for sponsoring these prizes!

Thanks a lot for participating in 1BRC,

--Gunnar

[jerrinot]

@gunnarmorling once more thanks to both you personally and Decodable! The two totally random numbers are: 27427 and 20503.