milamberspace commented on code in PR #6462:
URL: https://github.com/apache/jmeter/pull/6462#discussion_r2152614556
##########
bin/jmeter:
##########
@@ -169,20 +170,26 @@ esac
# Default to en_EN
: "${JMETER_LANGUAGE:="-Duser.language=en -Duser.region=EN"}"
-# Uncomment this to generate GC verbose file with Java prior to 9
-# VERBOSE_GC="-verbose:gc -Xloggc:gc_jmeter_%p.log -XX:+PrintGCDetails
-XX:+PrintGCCause -XX:+PrintTenuringDistribution -XX:+PrintHeapAtGC
-XX:+PrintGCApplicationConcurrentTime -XX:+PrintAdaptiveSizePolicy
-XX:+PrintGCApplicationStoppedTime -XX:+PrintGCDateStamps"
+# Legacy GC verbose options removed (Java 8/9 support discontinued)
+
+# Optimized GC logging for Java 17 with structured output and performance
analysis
+# Uncomment to enable comprehensive GC logging with rotation and detailed
metrics
+#
VERBOSE_GC="-Xlog:gc,gc+heap,gc+regions,gc+refine,gc+phases:gc_jmeter_%p_%t.log:time,level,tags:filecount=5,filesize=50M"
+
+# Alternative: Minimal GC logging for production (uncomment if needed)
+# VERBOSE_GC="-Xlog:gc:gc_jmeter_%p.log:time"
-# Uncomment this to generate GC verbose file with Java 9 and above
-# VERBOSE_GC="-Xlog:gc*,gc+age=trace,gc+heap=debug:file=gc_jmeter_%p.log"
+# Docker support for Java 17+
+# Modern container memory detection is automatic in Java 17+
+# RUN_IN_DOCKER="-XX:+UseContainerSupport"
-# Uncomment this if you run JMeter in DOCKER (need Java SE 8u131 or JDK 9)
-# see
https://blogs.oracle.com/java-platform-group/java-se-support-for-docker-cpu-and-memory-limits
-# RUN_IN_DOCKER="-XX:+UnlockExperimentalVMOptions
-XX:+UseCGroupMemoryLimitForHeap"
+# Java 17 specific performance optimizations
+# Modern JVM performance flags for better throughput and reduced latency
+JAVA17_PERFORMANCE="-XX:+AlwaysPreTouch -XX:+UseLargePages
-XX:+OptimizeStringConcat"
-# Finally, some tracing to help in case things go astray:
-# You may want to add those settings:
-# -XX:+ParallelRefProcEnabled -XX:+PerfDisableSharedMem
-: "${GC_ALGO:="-XX:+UseG1GC -XX:MaxGCPauseMillis=100 -XX:G1ReservePercent=20"}"
+# Enhanced G1GC tuning for Java 17
+# Improved G1 performance with better defaults and new features
+: "${GC_ALGO:="-XX:+UseG1GC -XX:MaxGCPauseMillis=100 -XX:G1ReservePercent=20
-XX:+ParallelRefProcEnabled -XX:+UseStringDeduplication
-XX:G1HeapRegionSize=16m"}"
Review Comment:
Right. Changed
##########
bin/jmeter.bat:
##########
@@ -151,25 +149,21 @@ if not defined HEAP (
set HEAP=-Xms1g -Xmx1g -XX:MaxMetaspaceSize=256m
)
-rem Uncomment this to generate GC verbose file with Java prior to 9
-rem set VERBOSE_GC=-verbose:gc -Xloggc:gc_jmeter_%%p.log -XX:+PrintGCDetails
-XX:+PrintGCCause -XX:+PrintTenuringDistribution -XX:+PrintHeapAtGC
-XX:+PrintGCApplicationConcurrentTime -XX:+PrintGCApplicationStoppedTime
-XX:+PrintGCDateStamps -XX:+PrintAdaptiveSizePolicy
-
-rem Uncomment this to generate GC verbose file with Java 9 and above
-rem set VERBOSE_GC=-Xlog:gc*,gc+age=trace,gc+heap=debug:file=gc_jmeter_%%p.log
-rem You may want to add those settings
-rem -XX:+ParallelRefProcEnabled -XX:+PerfDisableSharedMem
+rem Legacy GC verbose options removed (Java 8/9 support discontinued)
+rem Enhanced G1GC tuning for Java 17
+rem Improved G1 performance with better defaults and new features
if not defined GC_ALGO (
- set GC_ALGO=-XX:+UseG1GC -XX:MaxGCPauseMillis=100 -XX:G1ReservePercent=20
+ set GC_ALGO=-XX:+UseG1GC -XX:MaxGCPauseMillis=100 -XX:G1ReservePercent=20
-XX:+ParallelRefProcEnabled -XX:+UseStringDeduplication -XX:G1HeapRegionSize=16m
Review Comment:
Thanks for comment, change in last PR version
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