According to one embodiment, a cartridge includes a main explosive and an exploding foil initiator housed in a case. The currently accepted approach for the design of GPS schedulers is based on deterministic QoS guarantees, which, it is generally accepted, is overly conservative and leads to limitations on capacity. A free magnetic layer is between the reference element and the compensation element, and an electrically insulating and non-magnetic tunneling barrier layer separates the free magnetic layer from the reference element. Each hydraulic cylinder is movable in response to a control signal and connected to the frame and a yoke. By overlapping the exit openings of respective lower and upper shunt tubes of adjacent manifolds, slurry will be delivered to across the entire completion interval. A composite handle for the composite instrument is provided comprising a first handle and a second handle when the first handle is coupled with the second handle.