SPEC SMT 97
The SPEC SMT 97 benchmark was an effort to update the SPEC SDM benchmark which never reached a release state.
The goal was to have a measure of a System's Multitasking Tasking capabilities.
Some insight into the efforts to develop this update can be found in Perspectives on the SPEC SDET Benchmark - A paper by Steven L. Gaede, Lone Eagle Systems, Inc.