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Biome Edge Interpolation

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@stephen-hqxu stephen-hqxu released this 28 Aug 20:47
v0.6.5
ec6dd78

Release 0.6.5

Data structure in STPSingleHistogramFilter

Profiling shows the implementation using std::vector has led to significant performance issue on MSVC compiler when debug runtime library (/MDd and /MTd) is enabled. Although the final performance in release mode is not affected, the slowness makes debugging during development impossible.

Result of a run with std::vector:

Compiler -O0/ms -O3/ms
MSVC 2019 >2000 ~60
GCC 10 ~200 ~30

We also notice time taken in release mode on MSVC is twice as long compared to GCC.

Improvement

  • Implement a custom version of std::vector, namely STPArrayList. It's a minimal data structure that only serves to STPSingleHistogramFilter. The goal is make it as simple as possible.
  • Remove all uses of back_inserter and instead pre-resize the array list and do a simple copy at once.

Result of a run with STPArrayList:

Compiler -O0/ms -O3/ms
MSVC 2019 && GCC 10 ~140 ~25

Data sets used in all benchmarks

Item Value
Dimension 512 * 512
Free-slip range 1536 * 1536
Radius 32
Sample range RNG, 0 to 14, both inclusive

Implement smooth biome transition

  • Implement procedures in STPBiomefieldGenerator to enable smooth biome transition with STPSingleHistogramFilter. This includes:
    • A CUDA memory pool.
    • A histogram buffer pool for reusing memory.
    • A host memory pool for releasing histogram buffer after execution.
    • Critical sections for thread safety.
    • Stream-ordered operations.
  • Making changes in the runtime compiled script to utilises histogram being sent to GPU.
  • Pinned memory allocation for histogram buffer is temporarily disabled due to some context issues.

General fixes and improvement

  • Inline definitions of STPFreeSlipManager since device functions cannot be exported as shared library.
  • Declare default on move constructor/assignment operators for certain class to make sure compiler does the right thing.
  • Replace custom deleter for STPPinnedHistogramBuffer with default-constructed struct so unique_ptr can be default constructed.
  • Improve documentation on the memory behaviour about the texture buffer.
  • Fix an issue causes uncatched comilation error in SuperDemo+ when using CUDA runtime compiler due to the changes made to the exception throw system previously.
  • Remove const specifier for variables in STPSingleHistogram.
  • Change the function parameter from taking a value to a rvalue reference in operator() in STPSingleHistogramWrapper
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