apache / apache/rocketmq-docker

JVM parameter -Xmn

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Description

when I download zip from [rocketmq](https://rocketmq.apache.org/download), runserver.sh, runbroker.sh show that:

server : -Xms4g -Xmx4g -Xmn2g
broker: -Xms8g -Xmx8g -Xmn4g

but in [runbroker-customize](https://github.com/apache/rocketmq-docker/blob/master/image-build/scripts/runbroker-customize.sh)
desired_yg_in_mb=`expr $max_heap_size_in_mb / 4`

so what size is recommended for Xmn? 1/2 Xmx or 1/4 Xmx?

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