GPU Accelerated Spectra

Example using GPU calculation with eq_spectrum_gpu()

This method requires CUDA compatible hardware to execute. For more information on how to setup your system to run GPU-accelerated methods using CUDA and Cython, check GPU Spectrum Calculation on RADIS

Note

in the example below, the GPU code runs on CPU, using the parameter emulate=True. In your environment, to run the GPU code with the full power of the GPU, remove this line or set emulate=False (default)

In ``/home/docs/.radisdb/hitemp`` keep only relevant input files:
/home/docs/.radisdb/hitemp/CO2-02_02125-02250_HITEMP2010.hdf5
/home/docs/.radisdb/hitemp/CO2-02_02250-02500_HITEMP2010.hdf5
Number of lines loaded: 1128265

Finished calculating spectrum!
1.09s - Spectrum calculated
Spectrum Name:  CO2-hitemp-radisdb-1100.0K-#6816
Spectral Quantities
----------------------------------------
   abscoeff     [cm-1]  (150,001 points)
   absorbance   (150,001 points)
   emissivity   (150,001 points)
   emissivity_noslit    (150,001 points)
   transmittance_noslit         (150,001 points)
   radiance_noslit      [mW/cm2/sr/cm-1]        (150,001 points)
   transmittance        (150,001 points)
Physical Conditions
----------------------------------------
   Tgas                 1100.0 K
   Trot                 1100.0 K
   Tvib                 1100.0 K
   isotope              1,2,3
   mole_fraction        0.8
   molecule             CO2
   overpopulation       None
   path_length          0.2 cm
   pressure_mbar        1000.0 mbar
   rot_distribution     boltzmann
   self_absorption      True
   state                X
   thermal_equilibrium  True
   vib_distribution     boltzmann
   wavenum_max          2450.0000 cm-1
   wavenum_min          2150.0000 cm-1
Computation Parameters
----------------------------------------
   NwG                  3
   NwL                  6
   Tref                 296 K
   add_at_used
   broadening_method    voigt
   cutoff               0 cm-1/(#.cm-2)
   dbformat             hitemp-radisdb
   dbpath               /home/docs/.radisdb/hitemp/CO2-02_02125-02250_HITEMP2010.hdf5,/home/docs/.radisdb/hitemp/CO2-02_0225...
   default_output_unit  cm-1
   diluent              air
   diluents             None
   emulate_gpu          True
   folding_thresh       1e-06
   include_neighbouring_lines  True
   memory_mapping_engine  auto
   neighbour_lines      0 cm-1
   optimization         simple
   parfuncfmt           hapi
   parsum_mode          full summation
   profiler             {'spectrum_calculation': {'scaled_S0': 0.043459660000280564, 'calc_other_spectral_quan': 0.005031825...
   pseudo_continuum_threshold  0
   radis_version        0.14
   sparse_ldm           auto
   spectral_points      150000.0
   truncation           50 cm-1
   waveunit             cm-1
   wstep                0.002 cm-1
   zero_padding         -1
Config parameters
----------------------------------------
   DEFAULT_DOWNLOAD_PATH  ~/.radisdb
   GRIDPOINTS_PER_LINEWIDTH_ERROR_THRESHOLD  1
   GRIDPOINTS_PER_LINEWIDTH_WARN_THRESHOLD  3
   SPARSE_WAVERANGE     auto
Information
----------------------------------------
   calculation_time     1.0896017839995693 s
   chunksize            None
   db_use_cached        True
   dxG                  0.1375350788016573
   dxL                  0.20180288881201608
   export_lines         False
   export_populations   None
   export_rovib_fraction  False
   levelsfmt            radis
   lines_calculated     1,128,265
   load_energies        False
   lvl_use_cached       True
   parfuncpath          None
   total_lines          1128265
   warning_broadening_threshold  0.01
   warning_linestrength_cutoff  0.01
   wavenum_max_calc     2450.0000 cm-1
   wavenum_min_calc     2150.0000 cm-1
----------------------------------------


<matplotlib.lines.Line2D object at 0x7fcf74a9a730>

from radis import SpectrumFactory

sf = SpectrumFactory(
    2150,
    2450,  # cm-1
    molecule="CO2",
    isotope="1,2,3",
    wstep=0.002,
)

sf.fetch_databank("hitemp")

s = sf.eq_spectrum_gpu(
    Tgas=1100.0,  # K
    pressure=1,  # bar
    mole_fraction=0.8,
    path_length=0.2,  # cm
    emulate=True,  # if True, runs CPU code on GPU. Set to False or remove to run on the GPU
)
print(s)

s.apply_slit(0.5)  # cm-1
s.plot("radiance", show=True)