Debugging

The ‘debugging’ parameter category contains parameters for toggling standard features as well as additional information on or off.

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print_load_imbalance

	Description		Controls how the work load imbalance should be displayed, if at all
	Default		True
	Elaboration		As described in the paper on ‘The cosmological simulation code CO𝘕CEPT 1.0’, each CPU core / MPI rank are responsible for a designated region of the box, called its domain. Over time, inhomogeneities naturally lead to some domains requiring a greater computational work load than others in order to evolve its contents through a time step. This load imbalance may be reported after each time step. By default, only the worst (largest) load imbalance between all CPU cores is shown.
	Example 0		Do not print out the load imbalance: print_load_imbalance = False
	Example 1		Print out load imbalance for all CPU cores: print_load_imbalance = 'full'

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particle_reordering

	Description		Specifies whether particles within a component are allowed to be periodically reordered in memory
	Default		True
	Elaboration		After a reordering, the particle data in memory is sorted so that it mimics the particle visiting order when traversing the tiles and subtiles of the short-range force. This improves CPU caching and can lead to a substantial speed-ups.
	Example 0		Disable periodic in-memory reordering of particles: particle_reordering = False
	Example 1		In case of several tilings, the reordering will be done with respect to the tiling belong to the short-range force with the largest computation time. Though preferable for performance, this introduces a slight indeterminacy which you may not want. To enable particle reordering but always done with respect to the same short-range force, use particle_reordering = 'deterministic' Note As CONCEPT currently only has a single short-range force implemented ('gravity'), this is — for the moment — equivalent to the default particle_reordering = True

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enable_Hubble

	Description		Enable the universal Hubble expansion of the background
	Default		True
	Elaboration		With enable_Hubble = True (the default), the Hubble expansion is turned on, so that the scale factor \(a(t)\) evolves according to the specified cosmology. For standard cosmological simulations, this is what we want. By default, CLASS is used to provide CONCEPT with \(a(t)\), though this can be disabled.
	Example 0		Turn off the Hubble expansion: enable_Hubble = False Caution This is really only intended for use with internal testing. A lot of basic functionality will not work in this mode.