mpmetis man page

mpmetis — Partitions a mesh into a specified number of parts.

Synopsis

mpmetis [options] meshfile nparts

Description

Required parameters
meshfile
Stores the mesh to be partitioned.
nparts

The number of partitions to split the mesh.

Optional parameters

-gtype=string

Specifies the graph to be used for computing the partitioning The possible values are:
dual
- Partition the dual graph of the mesh [default]
nodal
- Partition the nodal graph of the mesh

-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 strategy [default]
random
- Compute a bisection at random

-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

-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).

-ncommon=int

Specifies the common number of nodes that two elements must have in order to put an edge between them in the dual graph. Default is 1.

-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.

Info

October 2016 mpmetis 5.1.0 User Commands