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mdbx: update README (note about HyperThreading in read-scalability benchmark).

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Change-Id: I03e49a9675ecf585a8e2df56cca9949dd9b5bccb
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Leonid Yuriev 2020-01-09 19:10:35 +03:00
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README.md
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@ -1,7 +1,7 @@
libmdbx
=======
_libmdbx_ is an extremely fast, compact, powerful, embedded
_libmdbx_ is an extremely fast, compact, powerful, embedded,
transactional [key-value store](https://en.wikipedia.org/wiki/Key-value_database)
database, with [permissive license](LICENSE).
_MDBX_ has a specific set of properties and capabilities,
@ -11,7 +11,7 @@ focused on creating unique lightweight solutions with extraordinary performance.
2. Provides **extraordinary performance**, minimal overhead through [Memory-Mapping](https://en.wikipedia.org/wiki/Memory-mapped_file) and `Olog(N)` operations costs by virtue of [B+ tree](https://en.wikipedia.org/wiki/B%2B_tree).
3. Requires **no maintenance and no crash recovery** since doesn't use [WAL](https://en.wikipedia.org/wiki/Write-ahead_logging), but that might be a caveat for some workloads.
3. Requires **no maintenance and no crash recovery** since doesn't use [WAL](https://en.wikipedia.org/wiki/Write-ahead_logging), but that might be a caveat for write-intensive workloads.
4. **Compact and friendly for fully embeddeding**. Only 25KLOC of `C11`, 64K x86 binary code,
no internal threads neither processes, but implements a simplified variant of the
@ -418,14 +418,14 @@ Performance comparison
All benchmarks were done in 2015 by [IOArena](https://github.com/pmwkaa/ioarena)
and multiple [scripts](https://github.com/pmwkaa/ioarena/tree/HL%2B%2B2015)
runs on Lenovo Carbon-2 laptop, i7-4600U 2.1 GHz, 8 Gb RAM,
runs on Lenovo Carbon-2 laptop, i7-4600U 2.1 GHz (2 physical cores, 4 HyperThreading cores), 8 Gb RAM,
SSD SAMSUNG MZNTD512HAGL-000L1 (DXT23L0Q) 512 Gb.
## Integral performance
Here showed sum of performance metrics in 3 benchmarks:
- Read/Search on 4 CPU cores machine;
- Read/Search on machine with 4 logical CPU in HyperThreading mode (i.e. actually 2 physical CPU cores);
- Transactions with [CRUD](https://en.wikipedia.org/wiki/CRUD)
operations in sync-write mode (fdatasync is called after each