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Type: Improvement
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Resolution: Duplicate
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Priority: Major - P3
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None
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Affects Version/s: None
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Component/s: WiredTiger
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None
storage: wiredTiger: engineConfig: cacheSizeGB: <number>
WT cache uses the higher value of 50% of system memory or 1GB by default
From what we've seen, MongoDB really needs the cache, but doesn't need much memory beyond that. We just increased to 85% of system memory and are getting dramatically better performance. Of course this may vary substantially by workload and user. However, I'd suggest that a higher default might be more appropriate for most users.
It'd be interesting to see how much heap we're using to help inform this decision, but unfortunately db.serverStatus().extra_info.heap_usage_bytes is returning a negative number - SERVER-19931
- duplicates
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SERVER-19135 Tune default cache size settings for WiredTiger
- Closed