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- Scaling NMIS Polling
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- Configuration Options for Server Performance Tuning
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Configuration items
NMIS runs a daemon to obtain periodically the nodes information.
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| Number of nodes | Number of threads |
|---|---|
| 120 | 3-4 |
OMK has the equivalent parameter:
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omkd_workers |
Setting also omkd_max_requests, will help to have the threads restart gracefully before they get too big.
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MongoDB memory usage
MongoDB, in its default configuration, will use will use the larger of either 256 MB or ½ of (ram – 1 GB) for its cache size.
MongoDB cache size can be changed by adding the cacheSizeGB argument to the /etc/mongod.conf configuration file, as shown below.
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storage:
dbPath: /var/lib/mongodb
journal:
enabled: true
wiredTiger:
engineConfig:
cacheSizeGB: 1 |
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