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Type:
Improvement
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Resolution: Fixed
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Priority:
Unknown
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Affects Version/s: 3.0.0
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Component/s: Performance, Read Operations
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None
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Fully Compatible
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Dotnet Drivers
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Not Needed
When deserialising a result batch, a BsonDeserializationContext is created for each document/object.
The logic can be changed to reuse the BsonDeserializationContext instance for each document/object.
The same reuse already happens in the driver in CommandMessageBinaryEncoder.ReadType1Section.
This reduces allocations and GC load.
Current implementation:
| Method | BenchmarkDataSetSize | Mean | Error | StdDev | Gen0 | Gen1 | Gen2 | Allocated |
|---|---|---|---|---|---|---|---|---|
| MultiFileExport | 565000000 | 8.230 s | 0.7249 s | 0.1882 s | 516000.0000 | 304000.0000 | 3000.0000 | 7.73 GB |
Reuse implementation:
| Method | BenchmarkDataSetSize | Mean | Error | StdDev | Gen0 | Gen1 | Gen2 | Allocated |
|---|---|---|---|---|---|---|---|---|
| MultiFileExport | 565000000 | 8.191 s | 0.2030 s | 0.0314 s | 514000.0000 | 318000.0000 | 3000.0000 | 7.68 GB |