## Abstract

We consider the classic scheduling/load balancing problems where there are m identical machines and n jobs, and each job should be assigned to some machine. Traditionally, the assignment of jobs to machines is measured by the makespan (maximum load) i.e., the L_{∞} norm of the assignment. An ε-approximation scheme was given by Hochbaum and Shmoys for minimizing the L_{∞} norm. In several applications, such as in storage allocation, a more appropriate measure is the sum of the squares of the loads (which is equivalent to the L_{2} norm). This problem was considered in [4, 5, 13] who showed how to approximate the optimum value by a factor of about 1.04. In fact, a more general measure, which is the L_{p} norm (for any p≥1) can also be approximated to some constant which may be as large as 3/2. We improve these results by providing an ε-approximation scheme for the general L_{p} norm (and in particular for the L_{2} norm). We also consider the case of restricted assignment of unit jobs where we show how to find in polynomial time, a solution which is optimal for all norms.

Original language | English |
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Pages | 493-500 |

Number of pages | 8 |

State | Published - 1997 |

Event | Proceedings of the 1996 8th Annual ACM-SIAM Symposium on Discrete Algorithms - New Orleans, LA, USA Duration: 5 Jan 1997 → 7 Jan 1997 |

### Conference

Conference | Proceedings of the 1996 8th Annual ACM-SIAM Symposium on Discrete Algorithms |
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City | New Orleans, LA, USA |

Period | 5/01/97 → 7/01/97 |