Details
Description
Publishing the number of leaf and branch nodes helps us understand quite a few things:
Branch-compression = (num branches * nodeSize) / (number of leaves * (keysize+8))
Leaf compression = (#leaves + #blobs) * nodeSize / uncompressedSize
TotalBranch size = num-branches * nodeSize
ratio of branches/leaves = #branches/#leaves.
Total branch size for a query/query set gives a good idea of a typical node cache size that would avoid branch misses (with scaling depending on whether it is decompressed).
Attachments
Issue Links
- relates to
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HPCC-28533 Support new index meta data in thor
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- Accepted
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HPCC-28406 Publish uncompressed size and offset of branches for indexes
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- Resolved
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