[2529] | 1 | #ifndef __XIOS_ONETCDF4_PLUGIN__ |
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| 2 | #define __XIOS_ONETCDF4_PLUGIN__ |
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| 3 | |
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| 4 | #include "xios_spl.hpp" |
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| 5 | |
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| 6 | #if !defined(USING_NETCDF_PAR) |
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| 7 | #include "exception.hpp" |
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| 8 | #endif |
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| 9 | |
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| 10 | #include "mpi.hpp" |
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| 11 | namespace xios |
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| 12 | { |
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| 13 | /*! |
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| 14 | \class CONetCDF4Plugin |
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| 15 | This class computes parameters for HDF5 plugin compression filters : SZ, ZFP ... |
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| 16 | */ |
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| 17 | class CONetCDF4Plugin |
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| 18 | { |
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| 19 | public: |
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| 20 | //! Compute HDF5 plugin parameters from SZ parameters |
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| 21 | static void interpretParametersSZ(const CArray<double,1>& inParams, size_t* nOutParams, unsigned int **outParams) |
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| 22 | { |
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| 23 | if (inParams.numElements()!=5) |
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| 24 | { |
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| 25 | ERROR("CONetCDF4Plugin::interpretParametersSZ(...)", "The SZ compressor requires 5 parameters : " |
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| 26 | << "compression_params=\"(0,4)[mode abs_err rel_err pw_rel_err psnr]\" must be specified," |
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| 27 | << " see details in https://www.mcs.anl.gov/~shdi/download/sz-2.0-user-guide.pdf" ); |
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| 28 | } |
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| 29 | *nOutParams = 9; |
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| 30 | *outParams = new unsigned int[*nOutParams]; |
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| 31 | |
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| 32 | for (size_t iParam=0 ; iParam<(*nOutParams) ; iParam++) (*outParams)[iParam] = 0; |
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| 33 | |
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| 34 | // 1st parameter is the SZ error bound mode |
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| 35 | // https://github.com/szcompressor/SZ/blob/master/hdf5-filter/H5Z-SZ/docs/H5Z-SZ-Guide.pdf |
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| 36 | (*outParams)[0] = (unsigned int)(inParams(0)); |
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| 37 | |
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| 38 | // 1 double -> 2 unsigned int |
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| 39 | for (size_t iParam=0 ; iParam<4 ; iParam++) |
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| 40 | { |
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| 41 | memcpy( &((*outParams)[1+iParam*2]), &(inParams(1+iParam)), sizeof(double) ); |
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| 42 | unsigned int tmp_swap = (*outParams)[1+iParam*2 ]; |
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| 43 | (*outParams)[1+iParam*2 ] = (*outParams)[1+iParam*2+1]; |
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| 44 | (*outParams)[1+iParam*2+1] = tmp_swap; |
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| 45 | } |
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| 46 | } |
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| 47 | |
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[2532] | 48 | //! Compute HDF5 plugin parameters from ZFP parameters |
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| 49 | static void interpretParametersZFP(const CArray<double,1>& inParams, size_t* nOutParams, unsigned int **outParams) |
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| 50 | { |
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| 51 | if (inParams.numElements()==0) // N = f( mode ) |
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| 52 | { |
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| 53 | ERROR("CONetCDF4Plugin::interpretParametersSZ(...)", "The 1st parameter of ZFP compressor is the mode, must be lower or equal to 5" ); |
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| 54 | } |
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| 55 | |
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| 56 | // https://github.com/LLNL/H5Z-ZFP/blob/master/test/test_write.c#L237 |
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| 57 | // https://github.com/LLNL/H5Z-ZFP/blob/master/src/H5Zzfp_version.h |
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| 58 | if (inParams(0) == 1) *nOutParams = 4; // RATE (mode=1) : 1 double |
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| 59 | else if (inParams(0) == 2) *nOutParams = 3; // PRECISION (mode=2) : 2 unsigned int |
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| 60 | else if (inParams(0) == 3) *nOutParams = 4; // ACCURACY (mode=3) : 1 double |
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| 61 | else if (inParams(0) == 4) *nOutParams = 6; // EXPERT (mode=4) : 3 unsigned int + 1 int |
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| 62 | else if (inParams(0) == 5) *nOutParams = 1; // REVERSIBLE (mode=5) : - |
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| 63 | |
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| 64 | *outParams = new unsigned int[*nOutParams]; |
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| 65 | |
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| 66 | // https://github.com/LLNL/H5Z-ZFP/blob/master/src/H5Zzfp_plugin.h |
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| 67 | (*outParams)[0] = (unsigned int)(inParams(0)); |
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| 68 | (*outParams)[1] = 0; |
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| 69 | if ((inParams(0) == 1)||(inParams(0) == 3)) |
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| 70 | { |
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| 71 | memcpy( &((*outParams)[2]), &(inParams(1)), sizeof(double) ); |
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| 72 | } |
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| 73 | else if (inParams(0) == 2) |
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| 74 | { |
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| 75 | (*outParams)[2] = (unsigned int)(inParams(1)); |
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| 76 | } |
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| 77 | else if (inParams(0) == 4) |
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| 78 | { |
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| 79 | (*outParams)[2] = (unsigned int)(inParams(1)); |
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| 80 | (*outParams)[3] = (unsigned int)(inParams(2)); |
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| 81 | (*outParams)[4] = (unsigned int)(inParams(3)); |
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| 82 | (*outParams)[5] = (unsigned int)(inParams(4)); |
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| 83 | } |
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| 84 | |
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| 85 | } |
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[2529] | 86 | }; |
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| 87 | } |
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| 88 | |
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| 89 | |
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| 90 | #endif // __XIOS_ONETCDF4_PLUGIN__ |
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