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CONCEPT changelog


🚀 1.1.0 — Still under development

✨ Features added

  • Overhaul of initial condition generation:
    • 1LPT, 2LPT and 3LPT now available (optionally with dealiasing).
      • Higher-order growth factors and rates implemented via CLASS.
    • BCC and FCC lattices for pre-initial conditions.
    • Local non-Gaussianity now available.
    • Besides the N-body gauge, the synchronous and the Newtonian gauge are now available as well.
    • Optional back-scaling (as opposed to direct realisation).
  • Bispectrum functionality:
    • Various configurations (equilateral, squeezed, stretched, isosceles, ...).
    • On-the-fly bispectrum measurements.
    • A bispec utility for computing bispectra from snapshots.
    • Reduced bispectra.
    • Novel anti-aliasing for bispectrum shells.
    • Perturbation theory (tree-level) predictions.
  • Particle IDs.
  • Noise-corrected power spectra.
  • Improved and generalized 3D renders.
  • Interlacing is now implemented through the new lattice system, meaning that we can now use either BCC (standard) or FCC interlacing. For potentials, we now have independent upstream and downstream interlacing.
  • Support for loading of TIPSY snapshots.
  • New remote job submission system, with the explicit --submit option.
  • CONCEPT_* environment variables corresponding to command-line options.
  • The class utility is easier to work with, owing to the new --kmin, --kmax and --modes options. The --times option can now also be used to specify explicit scale factor values to use.
  • The watch utility will now state the approximate time a job has to wait in the queue. Also, multiple job IDs can now be supplied. Finally, the option --indefinite is added, allowing the watch utility to run forever.

⚡ Optimizations

  • The random numbers used for the primordial noise are now drawn in a distributed fashion.
  • Snapshot data can now be saved and loaded partially (e.g. only particle positions).
  • Multi-file GADGET snapshots can now be written in parallel.
  • Faster detrending of perturbations.

👌 Other changes

  • Some command-line options are renamed. Boolean command-line options may now be supplied with an optional Boolean value.
  • The binning of power spectra is now done logarithmically in wave number. The powerspec_options['binsize'] parameter has accordingly been substituted for powerspec_options['bins per decade'].
  • Default particle softening length changed to 2.5% of the mean inter-particle distance.
  • The install script has been made more robust, in particular with regards to pre-installed MPI distributions, non-GNU compilers and Python packages, in particular NumPy/SciPy.
  • Python >= 3.11 is now required.

Commits since 1.0.1



🚀 1.0.1 — 2021-12-07

🐛 Bugs fixed

  • Now safe to install CONCEPT into non-empty directory.
  • The code now refuses to run if the domain tile decomposition is less than (3, 3, 3), as this otherwise leads to incorrect pairing when using non-trivial subtiling.
  • Running a CLASS perturbation computation across more compute nodes than Fourier modes is now possible.

📖 Documentation

  • Copying code blocks containing prompts now leaves out the prompts.

👌 Other changes

  • The install script is now more user-friendly and less error prone when it comes to choosing an installation directory.

Commits since 1.0.0



🚀 1.0.0 — 2021-12-03

✨ Features added

  • Documentation.
  • Docker images.
  • Continuous integration and deployment through GitHub workflows.
  • Proper example parameter files.
  • Proper P³M via tiles and subtiles.
  • Adaptive particle time-stepping.
  • Overhaul of grid implementation:
    • Grids used for PM, power spectra and 2D renders are now separate.
    • Addition of grid quantities from components are now carried out in an upstream → global → downstream scheme. Only the global grid is common to all components. Different sized upstream grids are added to the global grid in Fourier space.
    • Nyquist planes are explicitly zeroed.
    • Switched to cell-centred values.
    • NGP, CIC, TSC, PCS interpolation.
    • Differentiation orders 2, 4, 6, 8, Fourier space differentiation.
    • Toggleable interlacing.
    • Toggleable deconvolution.
  • Full GADGET snapshot support.
  • B-spline particle softening and only soften the Newtonian force.
  • History-independent time step size.
  • Allow for static global time-stepping.
  • 'Paired-and-fixed' initial conditions.
  • Linear N-body gauge power spectrum output.
  • Allow finite life times of components.
  • Display of load imbalance.
  • The --job-name option to concept.
  • The --no-lto option to concept.
  • The --rebuild option to concept.
  • The --repeats option to the play utility.

🐛 Bugs fixed

  • Guard against particles with positions right at the edge of the box, domains, etc.

⚡ Optimizations

  • Particle positions/momenta now stored contiguously in memory.
  • Chunkified domain/slab decompositions.
  • Chunkified and linear complexity particle exchange.
  • Chunkified snapshot read and write.
  • More performant grid differentiation.
  • More aggressive compile time optimization.
  • New --native-optimizations option to concept.
  • Fine-grained inlining.
  • Basic invocation of concept and make sped up.
  • Disabling of Cython assertions.
  • Transpile-time insertions of NAN and INFINITY literals.

🤖 Tests

  • Test of update utility.
  • Test of example parameter files.

👌 Other changes

  • New and more organised directory structure.
  • Generalised build system:
    • Multiple simultaneous builds possible.
    • Build from submitted job possible.
  • Convenient path and param variables in parameter files.
  • Generalised species.
  • More tunable power spectrum settings.
  • Allow for deterministic FFTW wisdom.
  • Switched to the PCG64 DXSM pseudo-random number generator.
  • Explicit registration of CLASS perturbations.
  • Improved robustness of the install script.
  • 'Slim builds' now available.

Commits since 0.3.0



🚀 0.3.0 — 2019-04-29

✨ Features added

  • Decaying dark matter, including dark radiation and the 'lapse component'.
  • Additional perturbations available from the class utility (e.g. ϕ, ψ).

🐛 Bugs fixed

  • PPF dark energy pressure perturbation corrected in CLASS.

⚡ Optimizations

  • Link time optimizations.
  • GSL linked to OpenBLAS.

👌 Other changes

  • Several improvements to the computation of dark energy perturbations in CLASS.
  • Added missing N-body gauge transformation for pressure perturbations.
  • Detrending of CLASS perturbations now done in intervals.
  • Broader compiler support by the install script.
  • Tests no longer performed by default by the install script (instead, supply -t).
  • More robust integration with pre-installed MPI libraries.

Commits since 0.2.1



🚀 0.2.1 — 2019-02-11

✨ Features added

  • Linear, dynamical dark energy (fluid and PPF).
  • The update utility can now update CLASS as well.

🐛 Bugs fixed

  • Erroneous sound speed computed in Kurganov Tadmor method.

👌 Other changes

  • Primordial spectrum separated from CLASS parameters.
  • CLASS perturbations are now MPI distributed.

Commits since 0.2.0



🚀 0.2.0 — 2018-11-05

✨ Features added

  • Linear neutrinos, photons and the 'metric component'.
  • The class utility.
  • Command-line parameters (-c) and job directives (-j) as options to concept.

🐛 Bugs fixed

  • Erroneous time-stepping limiter for fluid components.

👌 Other changes

  • Random numbers for initial condition generation now drawn in shells.

Commits since 0.1.0



🚀 0.1.0 — 2018-01-16

✨ Features

  • Installation script.
  • Cython framework.
  • CLASS integration.
  • Initial condition generation, adopting the N-body gauge.
  • Particle (matter) components with Plummer softening.
  • Fluid (massive neutrino) components, focusing on non-linear evolution.
  • Gravity:
    • PP.
    • PM.
    • P³M (inefficient).
  • Snapshots:
    • Native CONCEPT format.
    • GADGET format (limited).
  • Power spectra.
  • 3D and 2D renders.
  • Utilities.
  • Test suite.