From 7bfc7eaec67d35ae8f13f4fe858889420a2d972e Mon Sep 17 00:00:00 2001
From: Roman Musin <995612+roman-r-m@users.noreply.github.com>
Date: Sun, 21 Jan 2024 17:01:23 +0000
Subject: Reduce allocations and heap size (#525)

* Reduce allocations

* Shrink the heap size

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

* no need to reverse bytes

* bump heap size
---
 calculate_average_roman-r-m.sh | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

(limited to 'calculate_average_roman-r-m.sh')

diff --git a/calculate_average_roman-r-m.sh b/calculate_average_roman-r-m.sh
index fe468dc..b5d0b3d 100755
--- a/calculate_average_roman-r-m.sh
+++ b/calculate_average_roman-r-m.sh
@@ -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
-- 
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