CODEWITHSUNDEEP
mongodbwiredtiger
lojunren
lojunren

Reputation: 139

MongoDB WiredTiger Storage Engine cacheSizeGB configure option

What's the minimum number of cacheSizeGB can I configure which configure option introduce by MongoDB 3.0.0 in WiredTiger Storage Engine?

Represent the number of cacheSizeGB must be integer? Can I configure it with floating number like 15.5?

I cannot find the detail from MongoDB official document.

Upvotes: 3

Views: 10526

Answers (1)

And0rian
And0rian

Reputation: 170

I know this is quite old, but as I fall on this question looking for an answer, here it is:

Changed in version 3.4: Values can range from 256MB to 10TB and can be a float. In addition, the default value has also changed.

default: 50% of RAM minus 1 GB, or 256 MB. Avoid increasing the WiredTiger internal cache size above its default value.

If you run mongod in a container (e.g. lxc, cgroups, Docker, etc.) that does not have access to all of the RAM available in a system, you must set storage.wiredTiger.engineConfig.cacheSizeGB to a value less than the amount of RAM available in the container. The exact amount depends on the other processes running in the container.

source: https://docs.mongodb.com/manual/reference/configuration-options/#storage.wiredTiger.engineConfig.cacheSizeGB

Upvotes: 7

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