一些学习资料 -Dfile.encoding=UTF-8 -Dsun.jnu.encoding=UTF-8 -Djava.io.tmpdir=/tmp -Djava.net.preferIPv6Addresses=false -XX:ActiveProcessorCount=4 -XX:-UseContainerSupport -Xss512k -Xmx4g -Xms4g -XX:MetaspaceSize=512m -XX:MaxMetaspaceSize=512m -XX:ReservedCodeCacheSize=240m -XX:+HeapDumpOnOutOfMemoryError -XX:+UseG1GC -XX:G1HeapRegionSize=4M -XX:InitiatingHeapOccupancyPercent=40 -XX:MaxGCPauseMillis=100 -XX:+TieredCompilation -XX:CICompilerCount=4 -XX:-UseBiasedLocking -XX:+PrintGCDetails -XX:+PrintGCDateStamps -XX:+PrintGCTimeStamps -XX:+PrintAdaptiveSizePolicy -XX:+PrintGCApplicationStoppedTime -XX:+PrintHeapAtGC -XX:+PrintStringTableStatistics -XX:+PrintTenuringDistribution -Xloggc:/opt/logs/gc.log -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=30 -XX:GCLogFileSize=50M -XX:+PrintFlagsFinal -XX:ErrorFile=/opt/logs/vmerr.log -XX:HeapDumpPath=/opt/logs