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(array, experimental) Add benchmark results for quicksort

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Viktor Lofgren 2024-05-14 18:15:30 +02:00
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code/libraries/array/cpp/readme.md
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# Array C++ Helpers
# LongArray C++ Helpers
This package contains helper functions for working with LongArray objects,
as native C++ calls. The helpers are only built on Linux, and if they are absent,
Java substitutes should be used instead.
Note that the C++ helpers are compiled with march=native, so they are not portable
Library loading and access is available through the
[NativeAlgos](java/nu/marginalia/NativeAlgos.java) class.
Note that the C++ helpers are compiled with march=native by default, so they are not portable
between different CPU architectures.
This provides a speedup for some operations, especially when using MemorySegment's
get methods and not Unsafe. Library loading and access is available through the
[NativeAlgos](java/nu/marginalia/NativeAlgos.java) class.
This provides a speedup for some operations, especially when compared to using MemorySegment's
get methods and not Unsafe.
## Benchmarks
JMH benchmark results for 64 bit quicksort N=2^10, 25 trials, graalvm 21.0.3:
| Implementation | Throughput ops/s | Error p=99% |
|----------------|------------------|-------------|
| native | 114.877 | 4.216 |
| unsafe | 98.443 | 2.723 |
| memorysegment | 72.492 | 1.980 |
Note that odds are stacked in favor of the native implementation
since the dataset is fairly large, meaning the call overhead is
less significant. For smaller datasets, the overhead of native
calls may be a bigger factor.