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Reduce allocations and heap size (#525)

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* Reduce allocations

* Shrink the heap size

* Calculate hash when reading name  (50-100ms difference)

* no need to reverse bytes

* bump heap size
This commit is contained in:
Roman Musin
2024-01-21 17:01:23 +00:00
committed by GitHub
parent 3e1951379a
commit 7bfc7eaec6
2 changed files with 31 additions and 23 deletions
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calculate_average_roman-r-m.sh
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@@ -19,7 +19,6 @@ JAVA_OPTS="--enable-preview -XX:+UseTransparentHugePages"
# epsilon GC needs enough memory or it makes things worse
# see https://stackoverflow.com/questions/58087596/why-are-repeated-memory-allocations-observed-to-be-slower-using-epsilon-vs-g1
# 2GB seems to be the sweet spot
JAVA_OPTS="$JAVA_OPTS -XX:+UnlockExperimentalVMOptions -XX:-EnableJVMCI -XX:+UseEpsilonGC -Xmx2G -Xms2G -XX:+AlwaysPreTouch"
JAVA_OPTS="$JAVA_OPTS -XX:+UnlockExperimentalVMOptions -XX:-EnableJVMCI -XX:+UseEpsilonGC -Xmx1G -Xms1G -XX:+AlwaysPreTouch"
java $JAVA_OPTS --class-path target/average-1.0.0-SNAPSHOT.jar dev.morling.onebrc.CalculateAverage_roman_r_m