node.js - Mongodb db.serverStatus() memory section doesn't show actual value -

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i'm trying create chart regarding db.serverstatus() output of remote or local mongodb connections.

this command outputs: 

 "mem": {     "bits": 64,     "resident": 258,     "virtual": 4807,     "supported": true,     "mapped": 2288,     "mappedwithjournal": 4576   },

which suits needs. unfortunately i've realized data never gets actual memory data , never change. (i've monitored 10 minutes)

am doing wrong ? or there other way actual memory usages ?

p.s. i've examined mongostat couldn't make work through meteor-js since it's executable.

thanks in advance


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