当我用3.11.6版本启动cassandra集群时，可用内存是15%，4,5天后，它会下降到10%，并逐渐减少，我们是否需要更改一些设置，使可用内存始终保持在14%到15%左右的恒定值。下面是一些cassandra与-xms982m-xmx982m-xmn200m一起运行的细节
-ea-xx:+usethreadprioritypolicy-xx:threadprioritypolicy=42-xx:+heapdumponautofmemoryerror-xss256k-xx:stringtablesize=1000003-xx:+alwayspretouch-xx:-usebiasedlocking-xx:+usetlab-xx:+resizetlab-xx:+usenuma-xx:+perfdisablesharedmem-djava.net.preferipv4stack=true-xx:+useparnewgc-xx:+useconcmarksweepgc-xx:+cmsparallermarkenabled-xx:surviorratio=8-xx:maxtenuringthreshold=1-xx:cmsinitiatingoccupancyfraction=75-xx:+仅使用cmsinitingoccupancyfraction-xx:cmswaitduration=10000-xx:+cmsparalleliniationmarkenabled-xx:+cmsedenchunksrecordalways-xx:+cmsclassunloadingenabled-xx:+打印gcdetails-xx:+打印gcdatestamps-xx:+打印heapatgc-xx:+打印enuringdistribution-xx:+printgcapplicationstoppedtime-xx:+printpromotionfailure-xx:+usegclogfilerotation-xx:numberofgclogfiles=10-xx:gclogfilesize=10m-xms982m-xmx982m-xmn200m
如果还需要什么，请告诉我。