solr jvm性能調優

solr jvm參數 -XX:NewRation=3(solr默認值，新生代與老年代內存比1:3) -XX:SurvivorRatio=4(solr默認值, eden: from survivor: to survivor=4:1:1) -XX:MaxTenuringThreshold=8(solr默認值，對象年齡計數器，MinorGc每存活一次加1) -XX:+UseConcMarkSweepG

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