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plumbing: format/packfile, performance optimizations for reading large commit histories#963

Merged

mcuadros merged 12 commits intosrc-d:masterfrom

filipnavara:perf-read

Nov 28, 2018

Commits on Nov 26, 2018

Avoid unnecessary seek calls that are determining offsets that are already known or about to be thrown away anyway.
filipnavara
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Fix bufferedSeeker.Seek for SeekCurrent and non-zero offset.
filipnavara
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Add loose object cache.
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Search packfile indexes first if we already loaded them.
filipnavara
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Improve performace for reading many small objects from packfile by letting the I/O buffers be used better.
filipnavara
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Fix infinite recursion in FSObject.
filipnavara
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Remove a cachePut that was adding FSObject to cache, which triggered out-of-memory errors. This code path was never previously triggered for filesystem-based storage.
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Combine deltaBaseCache and simpleObjectCache into one objectCache.
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Add smallObjectThreshold constant instead of magic number.
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Add simple tests for SeekObjectHeader.
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Fix build after rebase.
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Do not treat delta references as small objects that can be eagerly loaded.
filipnavara
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