The arguments to xprint queue and xprint mem are optional. The application debug environment
keeps track of all the XRT library objects and automatically prints all valid queues and
cl_mem objects if the argument is not specified. In
addition, the commands do a proper validation of supplied command queue, event, and cl_mem arguments.
xprint queue [<cl_command_queue>]
xprint event <cl_event>
xprint mem [<cl_mem>]
xprint kernel
xprint all