Helper threading accelerates a program by exploiting a processor's multithreading capability to run assist threads. Based on the helper threading usage model, Virtual Multithreading (VMT), a form of switch-on-event user-level multithreading, can improve performance for real-world workloads with awall-clock speedup of 5.0 to 38.5 percent.
Citation:
Perry H. Wang, Jamison D. Collins, Hong Wang, Dongkeun Kim, Bill Greene, Kai-Ming Chan, Aamir B. Yunus, Terry Sych, Stephen F. Moore, John P. Shen, "Helper Threads via Virtual Multithreading," IEEE Micro, vol. 24, no. 6, pp. 74-82, Nov./Dec. 2004, doi:10.1109/MM.2004.75