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mdbx: packing the 16-bit representations of grow step and shrink threshold values.

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Using float point (exponential quantized) representation for internal 16-bit values
of grow step and shrink threshold when huge ones
.
To minimize the impact on compatibility, only the odd values inside the upper half
of the range (i.e. 32769..65533) are used for the new representation.

Resolve https://github.com/erthink/libmdbx/issues/166

Change-Id: I273127c1842deef0d7d8885b55a805b1463556eb
This commit is contained in:
Leonid Yuriev
2021-03-09 11:54:20 +03:00
parent 57af1d2310
commit 8e51a10908
3 changed files with 172 additions and 94 deletions
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ChangeLog.md
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@@ -23,6 +23,10 @@ New features:
The `MDBX_DISABLE_PAGECHECKS=1` provides a performance boost of about 10% in CRUD scenarios,
and conjointly with the `MDBX_ENV_CHECKPID=0` and `MDBX_TXN_CHECKOWNER=0` options can yield
up to 30% more performance compared to LMDB.
- Using float point (exponential quantized) representation for internal 16-bit values
of grow step and shrink threshold when huge ones (https://github.com/erthink/libmdbx/issues/166).
To minimize the impact on compatibility, only the odd values inside the upper half
of the range (i.e. 32769..65533) are used for the new representation.
Fixes: