improved 2nd and final submission

[yourwass]

• eliminated memory allocations on the hot path
• used serkan-ozal's trick to exclude munmap from timings

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): 216

• Execution time:

• Execution time of reference implementation:

[gunnarmorling]

00:02.557 now. Thx for particpating in 1BRC and congrats on creating one of the fastest entries!

[gunnarmorling]

Hey @yourwass!

Congrats again on being in the Top 20 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 or here (I'll use whichever one is cheaper for me to ship to your location). A big thank you to Decodable for sponsoring these prizes!

Thanks a lot for participating in 1BRC,

--Gunnar