From 6c0949969a5df71df85397ce3338f0154e6727ac Mon Sep 17 00:00:00 2001
From: Roman Musin <995612+roman-r-m@users.noreply.github.com>
Date: Tue, 23 Jan 2024 19:19:07 +0000
Subject: Native image + a few smaller optimisations (#564)

* Inline parsing name and station to avoid constantly updating the offset field (-100ms)

* Remove Worker class, inline the logic into lambda

* Accumulate results in an int matrix instead of using result row (-50ms)

* Use native image
---
 calculate_average_roman-r-m.sh | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

(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 b5d0b3d..acf9864 100755
--- a/calculate_average_roman-r-m.sh
+++ b/calculate_average_roman-r-m.sh
@@ -21,4 +21,15 @@ JAVA_OPTS="--enable-preview -XX:+UseTransparentHugePages"
 # see https://stackoverflow.com/questions/58087596/why-are-repeated-memory-allocations-observed-to-be-slower-using-epsilon-vs-g1
 JAVA_OPTS="$JAVA_OPTS -XX:+UnlockExperimentalVMOptions -XX:-EnableJVMCI -XX:+UseEpsilonGC -Xmx1G -Xms1G -XX:+AlwaysPreTouch"
 
-java $JAVA_OPTS --class-path target/average-1.0.0-SNAPSHOT.jar dev.morling.onebrc.CalculateAverage_roman_r_m
+if [ -f target/CalculateAverage_roman_r_m_image ]; then
+    echo "Picking up existing native image 'target/CalculateAverage_roman_r_m_image', delete the file to select JVM mode." 1>&2
+    target/CalculateAverage_roman_r_m_image
+else
+    JAVA_OPTS="--enable-preview -XX:+UnlockExperimentalVMOptions -XX:+TrustFinalNonStaticFields -dsa -XX:+UseNUMA"
+    if [[ ! "$(uname -s)" = "Darwin" ]]; then
+        # On OS/X, my machine, this errors:
+        JAVA_OPTS="$JAVA_OPTS -XX:+UseTransparentHugePages"
+    fi
+    echo "Choosing to run the app in JVM mode as no native image was found, use additional_build_step_roman_r_m.sh to generate." 1>&2
+    java $JAVA_OPTS --class-path target/average-1.0.0-SNAPSHOT.jar dev.morling.onebrc.CalculateAverage_roman_r_m
+fi
-- 
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