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Here is an interesting information regarding how MongoDB reserves memory for internal cache and WiredTiger, the underneath technology. Also some adjustment that can be done: https://dba.stackexchange.com/questions/148395/mongodb-using-too-much-memory
Server examples
Two servers are compared in this section.
- Master only have one node, but more than 400 poller nodes. opHA process is what will require more CPU and memory usage.
- Poller have more more than 500 nodes. nmis process will require more CPU and memory, for polling the information for all the nodes.
Stressed system
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