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BUILT-IN MATHEMATICA SYMBOL

CloseKernels

terminates all parallel kernels from the list Kernels

CloseKernels[k]
terminates the kernel k.

terminates the kernels

, ....

Kernels can be specified either using KernelObject, as returned by Kernels, or using their integer IDs, as returned by $KernelID.

Closed kernels are removed from the list of kernels available for parallel computing, as given by Kernels.

Close all running parallel kernels:

Out[1]=

Close any parallel kernels that may be running and launch the default kernels:

Close all kernels:

Launch copies of the previously running kernels:

Measure the speedup of the same calculation with different numbers of kernels used:

Distributed definitions and shared variables apply to running kernels and new ones:

Packages read with ParallelNeeds also apply to running and new kernels:

Close all running kernels and launch new ones:

The new kernels inherit previously distributed definitions and shared variables:

The new kernels also inherit packages read previously:

If no kernels are available, most parallel calculations are done sequentially: