gpmetis (1)

gpmetis [options] graphfile nparts

• Required parameters

graphfile

Stores the graph to be partitioned.

nparts

The number of partitions to split the graph.

• Optional parameters -ptype=string

• Specifies the scheme to be used for computing the k-way partitioning. The possible values are:

rb

- Recursive bisectioning

kway

- Direct k-way partitioning [default] -ctype=string

• Specifies the scheme to be used to match the vertices of the graph during the coarsening. The possible values are:

rm

- Random matching

shem

- Sorted heavy-edge matching [default] -iptype=string [applies only when -ptype=rb]

• Specifies the scheme to be used to compute the initial partitioning of the graph. The possible values are:

grow

- Grow a bisection using a greedy scheme [default for ncon=1]

random

- Compute a bisection at random [default for ncon>1] -objtype=string [applies only when -ptype=kway]

• Specifies the objective that the partitioning routines will optimize. The possible values are:

cut

- Minimize the edgecut [default]

vol

- Minimize the total communication volume -no2hop

• Specifies that the coarsening will not perform any 2-hop matchings when the standard matching fails to sufficiently contract the graph. -contig [applies only when -ptype=kway]

• Specifies that the partitioning routines should try to produce partitions that are contiguous. Note that if the input graph is not connected this option is ignored. -minconn [applies only when -ptype=kway]

• Specifies that the partitioning routines should try to minimize the maximum degree of the subdomain graph, i.e., the graph in which each partition is a node, and edges connect subdomains with a shared interface. -tpwgts=filename

• Specifies the name of the file that stores the target weights for each partition. By default, all partitions are assumed to be of the same size. -ufactor=int

• Specifies the maximum allowed load imbalance among the partitions. A value of x indicates that the allowed load imbalance is 1+x/1000. For ptype=rb, the load imbalance is measured as the ratio of the 2*max(left,right)/(left+right), where left and right are the sizes of the respective partitions at each bisection. For ptype=kway, the load imbalance is measured as the ratio of max_i(pwgts[i])/avgpwgt, where pwgts[i] is the weight of the ith partition and avgpwgt is the sum of the total vertex weights divided by the number of partitions requested. For ptype=rb, the default value is 1 (i.e., load imbalance of 1.001). For ptype=kway, the default value is 30 (i.e., load imbalance of 1.03). -ubvec=string

• Applies only for multi-constraint partitioning and specifies the per constraint allowed load imbalance among partitions. The required parameter corresponds to a space separated set of floating point numbers, one for each of the constraints. For example, for three constraints, the string can be "1.02 1.2 1.35" indicating a desired maximum load imbalance of 2%, 20%, and 35%, respectively. The load imbalance is defined in a way similar to ufactor. If supplied, this parameter takes priority over ufactor. -niter=int

• Specifies the number of iterations for the refinement algorithms at each stage of the uncoarsening process. Default is 10. -ncuts=int

• Specifies the number of different partitionings that it will compute. The final partitioning is the one that achieves the best edgecut or communication volume. Default is 1. -nooutput

• Specifies that no partitioning file should be generated. -seed=int

• Selects the seed of the random number generator. -dbglvl=int

• Selects the dbglvl. -help

• Prints this message.

The full documentation for gpmetis is maintained as a Texinfo manual. If the info and gpmetis programs are properly installed at your site, the command

• info gpmetis

should give you access to the complete manual.