[ntuple] Simplify and clean up compression #17847
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Test Results 18 files 18 suites 4d 7h 14m 13s ⏱️ Results for commit d1b534d. ♻️ This comment has been updated with latest results. |
enirolf
approved these changes
Feb 28, 2025
InitImpl, CommitClusterGroupImpl, and CommitDatasetImpl already allocate a buffer that is large enough and it is not needed to pass via the internal buffer of RNTupleCompressor just to memcpy the compressed contents out again.
It was already unused in SealPage since commit 208061d ("fix unbuffered compression of large pages"). This saves 16 MiB of internal compression buffer per page sink.
A RNTupleDecompressor will internally allocate a buffer of 16 MiB, which is not needed for the anchor. It was also the only usage of in-place decompression with RNTupleDecompressor.
They are not used anymore in the source code.
They are not used anymore in the source code.
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(just rebasing to get a green CI before merging) |
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... eventually removing all member methods of RNTuple(De)Compressor; see the individual commits for more details. As a visible result, this saves 16 MiB of internal compression buffer per page sink.