serkan-ozal's 2nd submission with some minor improvements

[serkan-ozal]

• use shared memory arena and region between worker threads
• reduce number of instructions slightly while processing file region

Check List:

• [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): 596

• Execution time: 3.6s (It was 3.7s in the first submission in my testing env. Let's see how it will be in the eval machine)

• Execution time of reference implementation: 5m 54.1s

[serkan-ozal]

Hi @gunnarmorling,

I have sent my 2nd submission. It is slightly faster in my testing env but let's see how it will perform in the eval machine.

[gunnarmorling]

00:02.512 now, nice!

Benchmark 1: timeout -v 300 ./calculate_average_serkan-ozal.sh 2>&1
  Time (mean ± σ):      2.512 s ±  0.017 s    [User: 0.001 s, System: 0.007 s]
  Range (min … max):    2.489 s …  2.533 s    5 runs

Summary
  serkan-ozal: trimmed mean 2.5122091559533333, raw times 2.50700669262,2.52399096262,2.53323767762,2.50562981262,2.4890358896199998

Leaderboard
grep: ./src/main/java*/dev/morling/onebrc/CalculateAverage_serkan-ozal.java: No such file or directory

| # | Result (m:s.ms) | Implementation     | JDK | Submitter     | Notes     |
|---|-----------------|--------------------|-----|---------------|-----------|

[serkan-ozal]

@gunnarmorling Thanks for quick evaluation.