Fix: jvm heap config

single_node/README.md

@@ -98,7 +98,7 @@ In the example above, the host file `../conf/main_net_config.conf` will be used.
 Logs generated by docker container will be mapped to your `../logs/mainnet/logs`.
 
 Flags in `command` are used for java-tron start-up arguments:
-- `-jvm` used for java virtual machine, the parameters must be enclosed in double quotes and braces. `"{-Xmx14g -Xms12g}"` sets the maximum and initial heap size to 14GB and 12GB respectively. If you want to set up a long run FullNode, please use the best practice jvm flags with `"{-Xmx14g -Xmn2g XX:ReservedCodeCacheSize=256m -XX:MetaspaceSize=256m -XX:MaxMetaspaceSize=512m -XX:MaxDirectMemorySize=1G -XX:+PrintGCDetails -XX:+PrintGCDateStamps  -Xloggc:gc.log -XX:+UseConcMarkSweepGC -XX:NewRatio=2 -XX:+CMSScavengeBeforeRemark -XX:+ParallelRefProcEnabled -XX:+HeapDumpOnOutOfMemoryError -XX:+UseCMSInitiatingOccupancyOnly  -XX:CMSInitiatingOccupancyFraction=70}"`.
+- `-jvm` used for java virtual machine, the parameters must be enclosed in double quotes and braces. `"{-Xmx14g -Xms12g}"` sets the maximum and initial heap size to 14GB and 12GB respectively. Taking the MainNet as an example, for a ordinary long-running FullNode, please use the best practice jvm flags with `"{-Xms12g -Xmx12g XX:ReservedCodeCacheSize=256m -XX:MetaspaceSize=256m -XX:MaxMetaspaceSize=512m -XX:MaxDirectMemorySize=1G -XX:+PrintGCDetails -XX:+PrintGCDateStamps  -Xloggc:gc.log -XX:+UseConcMarkSweepGC -XX:NewRatio=3 -XX:+CMSScavengeBeforeRemark -XX:+ParallelRefProcEnabled -XX:+HeapDumpOnOutOfMemoryError -XX:+UseCMSInitiatingOccupancyOnly  -XX:CMSInitiatingOccupancyFraction=70}"`, for a FullNode started as a witness, use `-Xms24g -Xmx24g` while keeping the rest same. 
 - `-c` defines the configuration file to use.
 - `-d` defines the database file to use. You can mount a directory for `datadir` with snapshots. This can save time by syncing from a near-latest block number. Please refer to [**Fullnode and Lite-Fullnode**](https://tronprotocol.github.io/documentation-en/using_javatron/backup_restore/#fullnode-data-snapshot) for Mainnet data. For the Nile testnet, you can download the snapshot [here](https://database.nileex.io/).
 - `-w` means to start as a witness. You need to fill the `localwitness` field with private keys in configure file. Refer to the [**Run as Witness**](https://tronprotocol.github.io/documentation-en/using_javatron/installing_javatron/#startup-a-fullnode-that-produces-blocks). If you want to use keystore + password method, make sure the keystore is inside the mounted directory and remove `-d` to interact with console for password input.

single_node/docker-compose.fullnode.main.yml

@@ -15,6 +15,6 @@ services:
       - ../output-directory/mainnet:/java-tron/output-directory
     command:
       - -jvm
-      - "{-Xmx14g -Xmn2g -XX:MaxDirectMemorySize=1G -XX:+UseConcMarkSweepGC -XX:+PrintGC -Xloggc:./logs/gc.log }"  # Using environment variable for JVM arguments
+      - "{-Xms12g -Xmx12g  -XX:MaxDirectMemorySize=1G -XX:+UseConcMarkSweepGC -XX:NewRatio=3 -XX:+PrintGC -Xloggc:./logs/gc.log }"  # Using environment variable for JVM arguments
       - -c
       - /java-tron/conf/main_net_config.conf