Abstract: A system traces operation of a multi-threaded executable application having concurrently operating code portions. An input processor receives data representing one or more data items being processed by an executable procedure. A filter processor determines whether the received data matches predetermined configuration parameters. A trace processor initiates generation of data tracing execution of instructions, comprising the executable procedure, in response to the received data matching the predetermined configuration parameters. The trace processor inhibits generation of the tracing data in response to the received data failing to match the predetermined configuration parameters.