[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 |
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| 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 |
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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 ] |
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this is fine for the mmap engine. |