Try more chunks than threads, and of different sizes (#644)

/**
 * Solution based on thomaswue solution, commit:
 * commit d0a28599c2
 * Author: Thomas Wuerthinger
 * Date:   Sun Jan 21 20:13:48 2024 +0100
 *
 * The goal here was to try to improve the runtime of his 10k
 * solution of: 00:04.516
 *
 * With Thomas latest changes, his time is probably much better
 * already, and maybe even 1st place for the 10k too.
 * See: https://github.com/gunnarmorling/1brc/pull/606
 *
 * But as I was already coding something, I'll submit just to
 * see if it will be faster than his *previous* 10k time of
 * 00:04.516
 *
 * Changes:
 *   It's a similar idea of my previous solution, that if you split
 * the chunks evenly, some threads might finish much faster and
 * stay idle, so:
 *   1) Create more chunks than threads, so the ones that finish first
 * can do something;
 *   2) Decrease chunk sizes as we get closer to the end of the file.
 */

prepare_tivrfoa.sh

@@ -20,7 +20,7 @@ sdk use java 21.0.2-graal 1>&2
 
 # ./mvnw clean verify removes target/ and will re-trigger native image creation.
 if [ ! -f target/CalculateAverage_tivrfoa_image ]; then
-    NATIVE_IMAGE_OPTS="--gc=epsilon -O3 -march=native --enable-preview -H:InlineAllBonus=10 -H:-ParseRuntimeOptions --initialize-at-build-time=dev.morling.onebrc.CalculateAverage_tivrfoa\$Scanner"
+    NATIVE_IMAGE_OPTS="--gc=epsilon -O3 -H:-GenLoopSafepoints -march=native --enable-preview -H:InlineAllBonus=10 -H:-ParseRuntimeOptions --initialize-at-build-time=dev.morling.onebrc.CalculateAverage_tivrfoa\$Scanner"
     # Use -H:MethodFilter=CalculateAverage_tivrfoa.* -H:Dump=:2 -H:PrintGraph=Network for IdealGraphVisualizer graph dumping.
     native-image $NATIVE_IMAGE_OPTS -cp target/average-1.0.0-SNAPSHOT.jar -o target/CalculateAverage_tivrfoa_image dev.morling.onebrc.CalculateAverage_tivrfoa
 fi