# Command: kernel

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Name:

    kernel - Global properties of the simulation kernel.

Description:

      Global properties of the simulation kernel.

Parameters:

      The following parameters are available in the kernel status dictionary.

      Time and resolution
      resolution	 doubletype 	- The resolution of the simulation (in ms)
      time	 doubletype 	- The current simulation time
      to_do	 integertype	- The number of steps yet to be simulated (read only)
      max_delay	 doubletype 	- The maximum delay in the network
      min_delay	 doubletype 	- The minimum delay in the network
      ms_per_tic	 doubletype 	- The number of milliseconds per tic
      tics_per_ms	 doubletype 	- The number of tics per millisecond
      tics_per_step	 integertype	- The number of tics per simulation time step
      T_max	 doubletype 	- The largest representable time value (read only)
      T_min	 doubletype 	- The smallest representable time value (read only)

      Parallel processing
      total_num_virtual_procs  integertype	- The total number of virtual processes
      local_num_threads	 integertype	- The local number of threads
      num_processes	 integertype	- The number of MPI processes (read only)
      num_rec_processes	 integertype	- The number of MPI processes reserved for recording spikes
      num_sim_processes	 integertype	- The number of MPI processes reserved for simulating neurons
      off_grid_spiking	 booltype  	- Whether to transmit precise spike times in MPI
      communication (read only)

      Random number generators
      grng_seed	 integertype	- Seed for global random number generator used
      synchronously by all virtual processes to
      create, e.g., fixed fan-out connections
      (write only).
      rng_seeds	 arraytype  	- Seeds for the per-virtual-process random
      number generators used for most purposes.
      Array with one integer per virtual process,
      all must be unique and differ from
      grng_seed (write only).

      Output
      data_path	 stringtype 	- A path, where all data is written to
      (default is the current directory)
      data_prefix	 stringtype 	- A common prefix for all data files
      overwrite_files	 booltype  	- Whether to overwrite existing data files
      print_time	 booltype  	- Whether to print progress information during the simulation

      Network information
      network_size	 integertype	- The number of nodes in the network (read only)
      num_connections	 integertype	- The number of connections in the network
      (read only, local only)

      Waveform relaxation method (wfr)
      use_wfr	 booltype  	- Whether to use waveform relaxation method
      wfr_comm_interval	 doubletype 	- Desired waveform relaxation communication interval
      wfr_tol	 doubletype 	- Convergence tolerance of waveform relaxation method
      wfr_max_iterations	 integertype	- Maximal number of iterations used for waveform relaxation
      wfr_interpolation_order  integertype	- Interpolation order of polynomial used in wfr iterations

      Miscellaneous
      dict_miss_is_error	 booltype  	- Whether missed dictionary entries are treated as errors

SeeAlso:

- Simulate
- Node

Source:

    /opt/conda/conda-bld/nest_1510212701067/work/nest-2.14.0/nestkernel/kernel_manager.h

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