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$DefaultParallelKernels

$DefaultParallelKernels

$DefaultParallelKernels

is the list of kernels that are configured for parallel computing.

Details

On a multicore computer, the list typically includes as many local kernels as there are cores, up to a limit defined by license availability.
Additional configurations for kernels on remote machines can be made available with the Wolfram Lightweight Grid, WSTPServer and SSH connections.
The value of $DefaultParallelKernels is remembered between sessions.
When no kernels are running, LaunchKernels[] will launch the kernels given in $DefaultParallelKernels.
$DefaultParallelKernels can be set by assigning a list of kernel configurations or via the Evaluation ▶ Parallel Kernel Configuration… menu item.

Examples

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Basic Examples (3)

The default value of $DefaultParallelKernels:

When no kernels are running, LaunchKernels uses this list as the default to launch kernels:

Kernels can be specified using URL syntax:

Kernels can be specified using KernelConfiguration:

Applications (2)

Assignments to $DefaultParallelKernels are remembered between sessions:

In a new session, the value is restored:

Remove any persistent value by reverting $DefaultParallelKernels to its default:

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