$DistributedDefinitions

gives the list of all symbols whose definitions have been distributed to parallel kernels.

Details

$DistributedDefinitions includes all symbols whose definitions have been distributed to parallel kernels either automatically or by using DistributeDefinitions.
$DistributedDefinitions returns a list of symbols wrapped in HoldForm.

open allclose all

Automatically distribute the value of a symbol:

Distribute the definition of a function:

By default, symbols in the current context are automatically distributed:

Clearing the distributed definitions may seem to work:

As soon as mat is used again in a parallel computation, its definition will be distributed automatically again:

Disable automatic distribution of definitions if you wish to control distribution of definitions manually:

The definition of a has not been distributed to parallel subkernels:

Distribute the definition of a manually:

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