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PROGRAM:

NAME


gpmetis - manual page for gpmetis 5.1.0

SYNOPSIS


gpmetis [options] graphfile nparts

DESCRIPTION


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.

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