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Setting ParallelGC as the default garbage collector (#20606)

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Closing #20568
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Alexander Schwartz 2023-06-05 17:48:28 +02:00 committed by GitHub
parent d80094793b
commit 2b16fda3a1
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2 changed files with 10 additions and 2 deletions
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6
quarkus/dist/src/main/content/bin/kc.bat vendored
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@ -74,7 +74,11 @@ goto READ-ARGS
if not "x%JAVA_OPTS%" == "x" (
echo "JAVA_OPTS already set in environment; overriding default settings with values: %JAVA_OPTS%"
) else (
set "JAVA_OPTS=-Xms64m -Xmx512m -XX:MetaspaceSize=96M -XX:MaxMetaspaceSize=256m -Djava.net.preferIPv4Stack=true -Dfile.encoding=UTF-8 -Dsun.stdout.encoding=UTF-8 -Dsun.err.encoding=UTF-8 -Dstdout.encoding=UTF-8 -Dstderr.encoding=UTF-8 -XX:+ExitOnOutOfMemoryError -Djava.security.egd=file:/dev/urandom"
rem The defaults set up Keycloak with '-XX:+UseParallelGC -XX:MinHeapFreeRatio=10 -XX:MaxHeapFreeRatio=20 -XX:GCTimeRatio=4 -XX:AdaptiveSizePolicyWeight=90' which proved to provide a good throughput and efficiency in the total memory allocation and CPU overhead.
rem If the memory is not used, it will be freed. See https://developers.redhat.com/blog/2017/04/04/openjdk-and-containers for details.
rem To optimize for large heap sizes or for throughput and better response time due to shorter GC pauses, consider ZGC and Shenandoah GC.
rem Both ZGC and Shenandoah GC seem to be more eager to claim the maximum heap size. Tests showed that ZGC might need additional tuning as it is not as aggressive as ParallelGC in reclaiming dead objects.
set "JAVA_OPTS=-Xms64m -Xmx512m -XX:MetaspaceSize=96M -XX:MaxMetaspaceSize=256m -Djava.net.preferIPv4Stack=true -Dfile.encoding=UTF-8 -Dsun.stdout.encoding=UTF-8 -Dsun.err.encoding=UTF-8 -Dstdout.encoding=UTF-8 -Dstderr.encoding=UTF-8 -XX:+ExitOnOutOfMemoryError -Djava.security.egd=file:/dev/urandom -XX:+UseParallelGC -XX:MinHeapFreeRatio=10 -XX:MaxHeapFreeRatio=20 -XX:GCTimeRatio=4 -XX:AdaptiveSizePolicyWeight=90"
)
@REM See also https://github.com/wildfly/wildfly-core/blob/7e5624cf92ebe4b64a4793a8c0b2a340c0d6d363/core-feature-pack/common/src/main/resources/content/bin/common.sh#L57-L60

6
quarkus/dist/src/main/content/bin/kc.sh vendored
View file

@ -85,7 +85,11 @@ fi
# Specify options to pass to the Java VM.
#
if [ "x$JAVA_OPTS" = "x" ]; then
JAVA_OPTS="-Xms64m -Xmx512m -XX:MetaspaceSize=96M -XX:MaxMetaspaceSize=256m -Djava.net.preferIPv4Stack=true -Dfile.encoding=UTF-8 -Dsun.stdout.encoding=UTF-8 -Dsun.err.encoding=UTF-8 -Dstdout.encoding=UTF-8 -Dstderr.encoding=UTF-8 -XX:+ExitOnOutOfMemoryError -Djava.security.egd=file:/dev/urandom"
# The defaults set up Keycloak with '-XX:+UseParallelGC -XX:MinHeapFreeRatio=10 -XX:MaxHeapFreeRatio=20 -XX:GCTimeRatio=4 -XX:AdaptiveSizePolicyWeight=90' which proved to provide a good throughput and efficiency in the total memory allocation and CPU overhead.
# If the memory is not used, it will be freed. See https://developers.redhat.com/blog/2017/04/04/openjdk-and-containers for details.
# To optimize for large heap sizes or for throughput and better response time due to shorter GC pauses, consider ZGC and Shenandoah GC.
# Both ZGC and Shenandoah GC seem to be more eager to claim the maximum heap size. Tests showed that ZGC might need additional tuning as as it is not as aggressive as ParallelGC in reclaiming dead objects.
JAVA_OPTS="-Xms64m -Xmx512m -XX:MetaspaceSize=96M -XX:MaxMetaspaceSize=256m -Djava.net.preferIPv4Stack=true -Dfile.encoding=UTF-8 -Dsun.stdout.encoding=UTF-8 -Dsun.err.encoding=UTF-8 -Dstdout.encoding=UTF-8 -Dstderr.encoding=UTF-8 -XX:+ExitOnOutOfMemoryError -Djava.security.egd=file:/dev/urandom -XX:+UseParallelGC -XX:MinHeapFreeRatio=10 -XX:MaxHeapFreeRatio=20 -XX:GCTimeRatio=4 -XX:AdaptiveSizePolicyWeight=90"
else
echo "JAVA_OPTS already set in environment; overriding default settings with values: $JAVA_OPTS"
fi