How to estimate the memory use of cc-metric-store

[moebiusband73]

This issue was migrated from cc-backend: ClusterCockpit/cc-backend#104

We want to use clustercockpit to monitor the cluster with 3000 nodes. Now the seperate machine installing clustercockpit is 8Gb memory. When the cc-metric-store start, the memory use of this machine will reach 90% or above, then it killed by system. To resolve this problem, we want to increas memory of machine, but we don't know the much memory is enough.

Is there a recommanded memory of our project?

The config of cc-metric-store is below:

numbers of nodes: 3000
numbers of metrics: 100+
"checkpoints" interval: 12h
"checkpoints" restore: 24h
retention-in-memory： 24h