52 lines
1.9 KiB
Markdown
52 lines
1.9 KiB
Markdown
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# G1CG调优
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- https://cloud.tencent.com/developer/article/1518229
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- -XX:+UseG1GC -XX:+UseStringDeduplication
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- -Xms2g -Xmx2g
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-XX:+UseG1GC -XX:MaxGCPauseMillis=20 -XX:G1HeapRegionSize=1m -XX:G1MixedGCCountTarget=10
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-Xloggc:/data/server/${app}/gc.log -XX:+PrintGCDetails -XX:+PrintGCDateStamps -XX:+PrintGCApplicationStoppedTime
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- -Xms2g -Xmx2g
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-XX:+UseG1GC
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-XX:MaxGCPauseMillis=100 // 调大停顿时间
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-XX:G1HeapRegionSize=2M # 调大region的大小来减少大对象占用的region数
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-XX:MaxTenuringThreshold=5
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-XX:InitiatingHeapOccupancyPercent=40 #手动设置IHOP。
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-XX:ConcGCThreads=4 //当前核心数的一半
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-XX:+UseStringDeduplication
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-XX:AutoBoxCacheMax=20000
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-XX:MetaspaceSize=128m -XX:MaxMetaspaceSize=256m
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-XX:+PrintPromotionFailure
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-XX:+HeapDumpOnOutOfMemoryError
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-XX:HeapDumpPath=./
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-Xlog:gc*:./gc-myapp.log
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-XX:+DisableExplicitGC //禁止显示手动GC，如果系统使用了堆外内存就不要禁用
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-XX:G1MixedGCCountTarget=10 // 把old区的回收分布到更多次GC当中
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- https://zhuanlan.zhihu.com/p/444564414
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## 启动参数
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```shell
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java -server
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-XX:+UseContainerSupport
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-XX:InitialRAMPercentage=70.0
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-XX:MaxRAMPercentage=70.0
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-XX:+UseG1GC
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-XX:MaxGCPauseMillis=20
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-XX:G1HeapRegionSize=1M
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-XX:InitiatingHeapOccupancyPercent=45
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-XX:+UseStringDeduplication
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-Ddruid.mysql.usePingMethod=false
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-javaagent:/app/skywalking-agent/skywalking-agent.jar
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-Dskywalking.agent.service_name=qifu-saas-wms-prod
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-Dskywalking.collector.backend_service=oap.qifu.svc:11800
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-jar
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-javaagent:/app/jmx_prometheus_javaagent-0.20.0.jar=8088:/app/jmx_exporter.yaml
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/app/qifu-saas-wms-service-1.0.13.jar
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--spring.config.location=/app/config/bootstrap.yml
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```
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### 参数说明
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- https://www.cnblogs.com/yu007/p/17900844.html
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- 容器环境替代 `-Xmx -Xms`:
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- ```shell
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-XX:+UseContainerSupport
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-XX:InitialRAMPercentage=70.0
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-XX:MaxRAMPercentage=70.0
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```
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