[SERVER-17020] Evictions by eviction server threads are reported as evictions by application threads Created: 23/Jan/15 Updated: 28/Jan/15 Resolved: 27/Jan/15 |
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| Status: | Closed |
| Project: | Core Server |
| Component/s: | Storage, WiredTiger |
| Affects Version/s: | 2.8.0-rc5 |
| Fix Version/s: | 3.0.0-rc7 |
| Type: | Bug | Priority: | Minor - P4 |
| Reporter: | Bruce Lucas (Inactive) | Assignee: | Keith Bostic (Inactive) |
| Resolution: | Done | Votes: | 0 |
| Labels: | wiredtiger | ||
| Remaining Estimate: | Not Specified | ||
| Time Spent: | Not Specified | ||
| Original Estimate: | Not Specified | ||
| Issue Links: |
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| Backwards Compatibility: | Fully Compatible | ||||||||
| Operating System: | ALL | ||||||||
| Participants: | |||||||||
| Description |
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__evict_worker calls __evict_lru_pages with is_app==1, so evictions by eviction server threads are reported under the "pages evicted by application threads" statistic. |
| Comments |
| Comment by Keith Bostic (Inactive) [ 27/Jan/15 ] |
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All changes merged into the WiredTiger RC7 branch, resolving. |
| Comment by Keith Bostic (Inactive) [ 26/Jan/15 ] |
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I went another way in my suggested patch #1596, I don't see value in counting the function calls, so I shuffled the code so the counters aren't incremented until after we have a page that we're going to try and evict. I did add another counter so we count the eviction attempts by application threads, vs. eviction worker threads, vs. the eviction server itself. All that said, I haven't been the primary debugger of WiredTiger eviction problems historically, so I'm going to defer to others as to which statistics are the most useful. |
| Comment by Mark Callaghan [ 26/Jan/15 ] |
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From looking at the code quickly, call doesn't imply eviction. Are two counters needed? One for calls and another for calls that do an eviction? |