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  • #14702

Closed
Open
Opened Jan 22, 2018 by blaze@trac-blaze

Runtime is keeping hold to too much memory

Currently runtime only releases memory to OS when it has more than 4x of the amount used. This leads to heavy memory overuse when process is run using many processes and large nurseries. For example, if process is run on 16 CPUs with each having 32MB nursery, it will use total 512MB allocation area. This will push "release boundary" to the 2GB. If process is ever to allocate that much memory for a short term use, it will never be given back to OS and effectively wasted.

Nursery and other non-growing data areas should be excluded from this multiplier. Runtime should only keep an extra memory proportional to heap allocation.

Trac metadata
Trac field Value
Version 8.2.2
Type Bug
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component Runtime System
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture
Assignee
Assign to
8.6.1
Milestone
8.6.1 (Past due)
Assign milestone
Time tracking
None
Due date
None
Reference: ghc/ghc#14702