Added UseTransparentHugePages after testing on a box

gunnarmorling · Jan 7, 2024 · 23913da · 23913da
1 parent 82cb329
commit 23913da
Showing 1 changed file with 7 additions and 4 deletions.
diff --git a/calculate_average_ddimtirov.sh b/calculate_average_ddimtirov.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 #
 #  Copyright 2023 The original authors
 #
@@ -15,9 +15,12 @@
 #  limitations under the License.
 #
 
+# also tried: 23.ea.3-open, 21.0.1-graalce, 21.0.1-graal, 21.0.1.crac-librca (tried CRaC API to see if it preserves JIT state)
+. "$HOME/.sdkman/bin/sdkman-init.sh"
+sdk use java 21.0.1-tem
+
 # --enable-preview to use the new memory mapped segments
 # We don't allocate much, so just give it 1G heap and turn off GC; the AlwaysPreTouch was suggested by the ergonomics
-JAVA_OPTS="--enable-preview -da -dsa -Xms1g -Xmx1g -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC  -XX:+AlwaysPreTouch"
+# Experimenting on the target VM config with various memory tweaks showed that UseTransparentHugePages gives us 10% boost
+JAVA_OPTS="--enable-preview -da -dsa -Xms1g -Xmx1g -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC  -XX:+AlwaysPreTouch -XX:+UseTransparentHugePages"
 time java $JAVA_OPTS --class-path target/average-1.0.0-SNAPSHOT.jar dev.morling.onebrc.CalculateAverage_ddimtirov
-
-# & "$Env:JAVA_HOME/bin/java" --enable-preview -Xms1g -Xmx1g -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC  -XX:+AlwaysPreTouch --class-path target/average-1.0.0-SNAPSHOT.jar dev.morling.onebrc.CalculateAverage_ddimtirov