[SERVER-14777] Option to limit physical memory used by a MongoD process Created: 04/Aug/14  Updated: 04/Aug/14  Resolved: 04/Aug/14

Status: Closed
Project: Core Server
Component/s: Internal Code, Sharding, Stability
Affects Version/s: None
Fix Version/s: None

Type: Improvement Priority: Major - P3
Reporter: Kevin J. Rice Assignee: Unassigned
Resolution: Duplicate Votes: 0
Labels: None
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Issue Links:
Duplicate
duplicates SERVER-2513 Ability to limit amount of resident m... Closed
duplicates SERVER-219 Ability to configure max memory Closed
Participants:

 Description   

Add rss memory-limit option to mongod (via conf file and/or command line), specifying the maximum amount of physical memory that a mongod instance will keep resident (RSS size).

MongoD instances will use all available memory on a machine, requesting as much as possible and paging it in as necessary.

On servers with multiple additional processes, having a mongod process gobble up all available memory is not "playing well with peers", as they say in kindergarten.

This limit would specify the maximum memory allotment to keep resident in either megabytes or gigabytes.

NOTE that technically Linux has a ulimit -m for RSS size, this limit is completely ignored as of Linux kernel version 2.4.x.

If the solution is implementing Linux 'control groups' (supposedly to be standard in RHEL 7.x), this might be a documentation problem. However, until then, and for people running pre RHEL-7.x, a documentation solution or a mongod startup option solution is required.



 Comments   
Comment by Thomas Rueckstiess [ 04/Aug/14 ]

Hi Kevin,

This feature request has been discussed before, see SERVER-2513 and SERVER-219. I'm closing this one as a duplicate.

Regards,
Thomas

Comment by Kevin J. Rice [ 04/Aug/14 ]

Note 1. this applies to all MongoDB installations running on a physical server instead of on a VM or 'in the cloud' situation.

Note 2. Postgresql, MySQL, and most other DB's allow configuration of how much physical memory (RSS) is used by Postgres. Granted MongoDB is not a SQL database, but it plays in the same application space.

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