# Relationship between the number of nodes and the amount of memory required

**URL:** <https://forums.percona.com/t/relationship-between-the-number-of-nodes-and-the-amount-of-memory-required/15787>\
**Category:** Percona Monitoring and Management (PMM)\
**Tags:** pmm\
**Created:** [May 23, 2022, 2:37pm UTC](https://forums.percona.com/t/relationship-between-the-number-of-nodes-and-the-amount-of-memory-required/15787 "2022-05-23T14:37:59Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Prashant\_Warrier](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/prashant_warrier/32/5408_2.png) [@Prashant\_Warrier](https://forums.percona.com/u/Prashant_Warrier)\
**Post date:** [May 23, 2022, 2:37pm UTC](https://forums.percona.com/t/relationship-between-the-number-of-nodes-and-the-amount-of-memory-required/15787/1 "2022-05-23T14:37:59Z")

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Our production environment currently consists of 30+ mongodb databases, multiple postgresql databases, a few HA proxy setups, and some mysql setups.

[The server setup documentation](https://docs.percona.com/percona-monitoring-and-management/setting-up/server/index.html#set-up-pmm-server) indicates that 20 nodes can be handled with 16Gi of RAM. The documentation also states that this relationship isn’t proportional either.

Therefore, my question is - _how much RAM would PMM server require to be able to monitor… say… around 50 nodes?_ Ideally, I would like to be able establish some kind of a relationship between the number of nodes and the amount of memory required.

One of my attempts to determine the amount of memory required was to extrapolate - and I ended up with a 32Gi requirement for 50 nodes.

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**Author:** ![matthewb](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/matthewb/32/34_2.png) [@matthewb](https://forums.percona.com/u/matthewb)\
**Post date:** [May 23, 2022, 3:51pm UTC](https://forums.percona.com/t/relationship-between-the-number-of-nodes-and-the-amount-of-memory-required/15787/2 "2022-05-23T15:51:50Z")

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Hello @Prashant_Warrier,  
I have a client with 624 nodes being monitored by a PMM server with 32GB RAM and 16 vCPUs. We don’t really have a formula for nodes-to-cpu or nodes-to-memory.

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**Author:** ![Prashant\_Warrier](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/prashant_warrier/32/5408_2.png) [@Prashant\_Warrier](https://forums.percona.com/u/Prashant_Warrier)\
**Post date:** [May 24, 2022, 5:20am UTC](https://forums.percona.com/t/relationship-between-the-number-of-nodes-and-the-amount-of-memory-required/15787/3 "2022-05-24T05:20:26Z")

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Thanks @matthewb - that was quite helpful! 🙂

Cheers,  
Prashant