Limit rocksdb cache usage

[Apurva Agarwal]

Hi Team,

How can we limit the usage of cache for rocksdb?

Thanks for your help!

[Mark Rambacher]

Can you better describe what you mean by "limit the usage of the cache"? What problem are you trying to solve?  More context would be most helpful.

/ Mark

 

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[Apurva Agarwal]

Hi Mark,

Thanks for the reply.

To elaborate on my query:
Our application runs on embedded device where we have some constrains on amount of resident memory which our app can use but currently we see that rocksdb uses around 300mb of resident memory. Hence we want to cap it to some lower number.

[Mark Rambacher]

I am not an expert on memory consumption, but you might want to start with Options::OptimizeForSmallDb() and see how those options change your performance.  Depending on how you are using RocksDB and your read/write ratio, you may also want to look at the options set by OptimizeForPointLookup().

/ Mark

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[Dan Carfas]

Here is the buzz from the Speedb hive in regards to your question:

" see Memory usage in RocksDB · facebook/rocksdb Wiki · GitHub"

If you have follow up questions or want more info and help, join our hive on Discord and Discourse