ndmetis man page
ndmetis — Computes a fillreducing ordering of the vertices of the graph using multilevel nested dissection.
Synopsis
ndmetis [options] <filename>
Description
Required parameters
 filename

Stores the graph to be partitioned.
Optional parameters
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 heavyedge matching [default]
iptype=string [applies only when ptype=rb]
Specifies the scheme to be used to compute the initial bisection of the graph. The possible values are:
 edge
 Separator from an edge cut
 node
 Separator from a greedy nodebased strategy [default]
rtype=string
Specifies the scheme to be used for refinement. The possible values are:
 1sided
 1sided nodebased refinement [default]
 2sided
 2sided nodebased refinement
ufactor=int
Specifies the maximum allowed load imbalance between the left and right partitions during each bisection. The load imbalanced is measured as the ratio of the 2*max(left,right)/(left+right), where left and right are the sizes of the respective partitions. A value of x indicates that the allowed load imbalance is 1+x/1000. Default is 200, indicating a load imbalance of 1.20.
pfactor=int
Specifies the minimum degree of the vertices that will be ordered last. If the specified value is x>0, then any vertices with a degree greater than 0.1*x*(average degree) are removed from the graph, an ordering of the rest of the vertices is computed, and an overall ordering is computed by ordering the removed vertices at the end of the overall ordering. Default value is 0, indicating that no vertices are removed
no2hop
Specifies that the coarsening will not perform any 2hop matchings when the standard matching fails to sufficiently contract the graph.
nocompress
Specifies that the graph should not be compressed by combining together vertices that have identical adjacency lists.
ccorder
Specifies if the connected components of the graph should first be identified and ordered separately.
niter=int
Specifies the maximum number of iterations for the refinement algorithms at each stage of the uncoarsening process. Default is 10.
nseps=int
Specifies the number of different separators that it will compute at each level of the nested dissection. The final separator that is used is the smallest one. Default is 1.
nooutput
Specifies that no ordering file should be generated.
seed=int
Selects the seed of the random number generator.
dbglvl=int
Selects the dbglvl.
help
Prints this message.