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SendReceive

OptionValues[Trace]gives the list of possible tracers
MathLinktrace MathLink events
SendReceivetrace Send/Receive operations
Queueingtrace process scheduling (Queue/Wait)
SharedMemorytrace shared variable access (available only if the VirtualShared package has been loaded)

Tracers.

SendReceive

A SendReceive trace message has the format
or
where slave is the kernel involved, expr is the expression sent or received, and n is the size of the kernel's queue.