ps aux
内存使用
ps aux|head -1;ps aux|grep -v PID|sort -rn -k +4|head -10
swap 使用
for i in $(ls /proc | grep "^[0-9]" | awk '$0>100'); do awk '/Swap:/{a=a+$2}END{print '"$i"',a/1024"M"}' /proc/$i/smaps;done| sort -k2nr | head
mongodb 命令
data0data0:PRIMARY> db.version();
4.2.17data0data0:PRIMARY> db.serverStatus().storageEngine;
{"name" : "wiredTiger","supportsCommittedReads" : true,"oldestRequiredTimestampForCrashRecovery" : Timestamp(1738804816, 1),"supportsPendingDrops" : true,"dropPendingIdents" : NumberLong(0),"supportsSnapshotReadConcern" : true,"readOnly" : false,"persistent" : true,"backupCursorOpen" : false
}
查看 wiredTiger 内存参数大小
单位字节
data0data0:PRIMARY> db.serverStatus().wiredTiger.cache["maximum bytes configured"]
1073741824
可以适当调小或者调大
data0data0:PRIMARY> db.adminCommand({setParameter: 1, "wiredTigerEngineRuntimeConfig": "cache_size=2GB" });
查看修改后的最新值
data0data0:PRIMARY> db.serverStatus().wiredTiger.cache["maximum bytes configured"];
2147483648
记得同步修改参数文件,避免实例重启后丢失修改值。
备注:
1、默认 WiredTiger 内部缓存大小为以下两者中的较大者:
(RAM 大小 - 1 GB)的 50%,或
256 MB.
https://www.mongodb.com/zh-cn/docs/v5.0/core/wiredtiger/#memory-use