Tune G1GC to reduce Besu memory footprint (hyperledger#5879)

Signed-off-by: Fabio Di Fabio <fabio.difabio@consensys.net>
Signed-off-by: garyschulte <garyschulte@gmail.com>

CHANGELOG.md

@@ -12,6 +12,7 @@
 
 ### Additions and Improvements
 - Layered transaction pool implementation is now stable and enabled by default. If you want still to use the legacy implementation, use `--tx-pool=legacy` [#5772](https://github.com/hyperledger/besu)
+- Tune G1GC to reduce Besu memory footprint, and new `besu-untuned` start scripts to run without any specific G1GC flags [#5879](https://github.com/hyperledger/besu/pull/5879)
 
 ### Bug Fixes
 - do not create ignorable storage on revert storage-variables subcommand [#5830](https://github.com/hyperledger/besu/pull/5830) 

build.gradle

@@ -551,6 +551,22 @@ def tweakStartScript(createScriptTask) {
 }
 
 startScripts {
+  defaultJvmOpts = applicationDefaultJvmArgs + [
+    "-XX:G1ConcRefinementThreads=2",
+    "-XX:G1HeapWastePercent=15",
+    "-XX:MaxGCPauseMillis=100"
+  ]
+  unixStartScriptGenerator.template = resources.text.fromFile("${projectDir}/besu/src/main/scripts/unixStartScript.txt")
+  windowsStartScriptGenerator.template = resources.text.fromFile("${projectDir}/besu/src/main/scripts/windowsStartScript.txt")
+  doLast { tweakStartScript(startScripts) }
+}
+
+task untunedStartScripts(type: CreateStartScripts) {
+  mainClass = 'org.hyperledger.besu.Besu'
+  classpath = startScripts.classpath
+  outputDir = startScripts.outputDir
+  applicationName = 'besu-untuned'
+  defaultJvmOpts = applicationDefaultJvmArgs
   unixStartScriptGenerator.template = resources.text.fromFile("${projectDir}/besu/src/main/scripts/unixStartScript.txt")
   windowsStartScriptGenerator.template = resources.text.fromFile("${projectDir}/besu/src/main/scripts/windowsStartScript.txt")
   doLast { tweakStartScript(startScripts) }
@@ -587,10 +603,10 @@ task autocomplete(type: JavaExec) {
   }
 }
 
-installDist { dependsOn checkLicenses, evmToolStartScripts }
+installDist { dependsOn checkLicenses, untunedStartScripts, evmToolStartScripts }
 
 distTar {
-  dependsOn checkLicenses, autocomplete, evmToolStartScripts
+  dependsOn checkLicenses, autocomplete, untunedStartScripts, evmToolStartScripts
   doFirst {
     delete fileTree(dir: 'build/distributions', include: '*.tar.gz')
   }
@@ -599,7 +615,7 @@ distTar {
 }
 
 distZip {
-  dependsOn checkLicenses, autocomplete, evmToolStartScripts
+  dependsOn checkLicenses, autocomplete, untunedStartScripts, evmToolStartScripts
   doFirst {
     delete fileTree(dir: 'build/distributions', include: '*.zip')
   }