Conventional gang scheduling has the disadvantage that when processes perform I/O or blocking communication, their processors remain idle because alternative processes cannot be run independently of their own gangs. To alleviate this problem, we suggest a slight relaxation of this rule: match gangs that make heavy use of the CPU with gangs that make light use of the CPU (presumably due to I/O or communication activity), and schedule such pairs together, allowing the local scheduler on each node to select either of the two processes at any instant. As l/O-intensive gangs make light use of the CPU, this only causes a minor degradation in the service to compute-bound jobs. This degradation is more than offset by the overall improvement in system performance due to the better utilization of the resources.
|Original language||American English|
|Number of pages||12|
|Journal||IEEE Transactions on Parallel and Distributed Systems|
|State||Published - Jun 2003|
Bibliographical noteFunding Information:
A preliminary version of this paper appeared in the 2001 Jerusalem Parallel Distributed Programming Symposium. Yair Wiseman was supported by a Lady Davis Fellowship. The ParPar cluster was supported by the Israel Science Foundation.
- Flexible resource management
- Gang scheduling
- Job mix