[SERVER-747] Flushing time is linear with data size even if there is nothing to flush Created: 15/Mar/10  Updated: 17/May/10  Resolved: 17/May/10

Status: Closed
Project: Core Server
Component/s: Performance
Affects Version/s: None
Fix Version/s: None

Type: Improvement Priority: Major - P3
Reporter: Mathias Stearn Assignee: Eliot Horowitz (Inactive)
Resolution: Won't Fix Votes: 0
Labels: None
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Participants:

 Description   

The kernel has to scan the whole pagetable for dirty pages, which seems to take about 1ms / 4GB of data. Maybe we should mark files as dirty and make flush() a no-op if it is clean.



 Comments   
Comment by Eliot Horowitz (Inactive) [ 17/May/10 ]

this is fine for the mmap engine.

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