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Description

The

SCOTCH graphOrderComputeList

routine computes a block ordering of a

subgraph of the graph structure pointed to by

grafptr

, using the ordering

strategy pointed to by

stratptr

, and stores its result in the ordering structure

pointed to by

ordeptr

. The induced subgraph is described by means of a

vertex list:

listnbr

holds the number of vertices to keep in the induced

subgraph, the indices of which are given, in any order, in the

listtab

array.

On return, the ordering structure holds a block ordering of the induced sub-
graph (see section 7.2.5 for a description of the ordering fields). To com-
pute this ordering, graph ordering methods such as the minimum degree and
minimum fill methods will base on the original degree of the induced graph
vertices, their non-induced neighbors being considered as halo vertices (see
Section 3.2.3 for more information on halo vertices).

Because an ordering always refers to the full graph, the ordering com-
puted by

SCOTCH graphOrderComputeList

is divided into two distinct parts:

the induced graph vertices are ordered by applying to the induced graph
the strategy provided by the

stratptr

parameter, while non-induced ver-

tex are ordered consecutively with the highest available indices.

Conse-

quently, the permuted indices of induced vertices range from

baseval

to

(

listnbr

+

baseval

−

1), while the permuted indices of the remaining ver-

tices range from (

listnbr

+

baseval

) to (

vertnbr

+

baseval

−

1), inclusive.

The separation tree yielded by

SCOTCH graphOrderComputeList

reflects this

property: it is made of two branches, the first one corresponding to the in-
duced subgraph, and the second one to the remaining vertices. Since these
two subgraphs are not considered to be connected, both will have their own
root, represented by a

−

1 value in the

treetab

array of the ordering.

Return values

SCOTCH graphOrderComputeList

returns 0 if the ordering has been success-

fully computed, and 1 else. In this latter case, the ordering arrays may however
have been partially or completely filled, but their contents are not significant.

7.8

Mesh handling routines

7.8.1

SCOTCH meshInit

Synopsis

int SCOTCH meshInit (SCOTCH Mesh *

meshptr)

scotchfmeshinit (doubleprecision (*)

meshdat,

integer

ierr)

Description

The

SCOTCH meshInit

function initializes a

SCOTCH Mesh

structure so as to

make it suitable for future operations. It should be the first function to be
called upon a

SCOTCH Mesh

structure. When the mesh data is no longer of

use, call function

SCOTCH meshExit

to free its internal structures.

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Содержание 5.1.10

Страница 1: ...sparse matrix block ordering of graphs and meshes hypergraphs It gives brief descriptions of the algorithms details the input output formats instructions for use installation procedures and provides...

Страница 2: ...rid incomplete nested dissection 15 3 2 1 Minimum Degree 15 3 2 2 Nested dissection 15 3 2 3 Hybridization 16 3 2 4 Performance criteria 16 3 2 5 Ordering methods 17 3 2 6 Graph separation methods 18...

Страница 3: ...rings 56 7 3 1 Using default strategy strings 57 7 3 2 Mapping strategy strings 58 7 3 3 Graph bipartitioning strategy strings 59 7 3 4 Ordering strategy strings 63 7 3 5 Node separation strategy stri...

Страница 4: ...erLoad 91 7 7 5 SCOTCH graphOrderSave 92 7 7 6 SCOTCH graphOrderSaveMap 92 7 7 7 SCOTCH graphOrderSaveTree 93 7 7 8 SCOTCH graphOrderCheck 93 7 7 9 SCOTCH graphOrderCompute 94 7 7 10 SCOTCH graphOrder...

Страница 5: ...SCOTCH meshGeomLoadHabo 118 7 11 10SCOTCH meshGeomLoadScot 118 7 11 11SCOTCH meshGeomSaveScot 119 7 12 Error handling routines 120 7 12 1 SCOTCH errorPrint 120 7 12 2 SCOTCH errorPrintW 120 7 12 3 SC...

Страница 6: ...reasonable time including the development of specific algorithms for common topologies such as the hypercube 11 21 When the target machine is assumed to have a communication network in the shape of a...

Страница 7: ...of the Dual Recursive Bipartitioning or DRB mapping algorithm and in the study of several graph bipartitioning heuristics 41 all of which have been implemented in the Scotch software package 45 Then i...

Страница 8: ...mitted on the channel respectively The target machine onto which is mapped the parallel program is also modeled by a valuated unoriented graph T called target graph or architecture graph Vertices vT a...

Страница 9: ...ping and map the load imbalance ratio as map def P vS V S wS vS P vT V T wT vT and map def P vT V T 1 wT vT P vS V S S T vS vT wS vS map P vS V S wS vS However since the maximum load imbalance ratio i...

Страница 10: ...ns Since domains may not be convex nor connected this distance may be estimated However it must respect certain homogeneity properties such as giving more accurate results as domain sizes decrease The...

Страница 11: ...iated with domain D between the two subdomains D0 and D1 of D Dotted edges are of dilation zero their two ends being mapped onto the same subdomain Thin edges are cocycle edges 3 1 5 Execution scheme...

Страница 12: ...ny type of graph bipartitioning method compatible with our criteria for quality Bipartitioning jobs maintain an in ternal image of the current bipartition indicating for every vertex of the job whethe...

Страница 13: ...n is se lected first This method is used in post processing of other methods when load balance is mandatory For weighted graphs the strict enforcement of load balance may cause the swapping of isolate...

Страница 14: ...mes in order to explore mostly in a gradient like fashion different areas of the solution space and the best partition found is kept Multi level This algorithm which has been studied by several author...

Страница 15: ...symmetric reordering This reordering is chosen in such a way that pivoting down the diagonal in order on the resulting permuted matrix PAPT produces much less fill in and work than computing the fact...

Страница 16: ...t has a partial visibility of the neighborhood of the subgraph Second the minimum degree algorithm returns the assembly tree that it computes for each subgraph thus allowing for supervariable amalgama...

Страница 17: ...in and operation count This method also implements amalgamation techniques that result in efficient block computa tions in the factoring and the solving processes Halo approximate minimum fill The hal...

Страница 18: ...ersion of the edge oriented multi level algorithm described in page 14 Thinner This greedy algorithm refines the current separator by removing all of the exceeding vertices that is vertices that do no...

Страница 19: ...erefore the overall number of edge data is twice the number of edges Since version 3 3 has been introduced a new file format referred to as the new style file format which replaces the previous old st...

Страница 20: ...which usually end in msh describe valuated meshes made of elements and nodes the elements of which can be mapped onto target architectures and the nodes of which can be reordered Meshes are bipartite...

Страница 21: ...val This header data is then followed by as many lines as there are node and element vertices in the graph These lines are similar to the ones of the graph format except that in order to save disk spa...

Страница 22: ...are vertices in the associated graph or mesh file only coordinates the labels of which match labels of graph or mesh vertices will be taken into account This feature allows all subgraphs of a given gr...

Страница 23: ...there are processors Each of these lines holds three numbers the processor label the processor weight that is an estimation of its computational power and its terminal number The terminal number asso...

Страница 24: ...elements while the upper lev els of the tree model interconnection networks intra chip buses inter chip interconnection networks network routers etc as shown in Figure 8 The communication cost betwee...

Страница 25: ...1 and the two subdomains of any domain i are labeled 2i and 2i 1 The distance between any two subdomains i and j is 0 if i j and 1 else varhcub Defines a variable sized hypercube Domains are labeled s...

Страница 26: ...he source graph or mesh The structure of ordering files is analogous to the one of mapping files they differ only by the meaning of their data Ordering files begin with the number of ordering lines wh...

Страница 27: ...t decomposition defined target files and especially to turn a source graph file into a target file The mapping and ordering programs themselves Output handling programs which are the mapping performan...

Страница 28: ...xternal mesh file mmk_ gmk_ mcv xyz Geometry file gord gmk_msh file ord Ordering file Mapping map gmtst file Graphics gout amk_grf gotst acpl amk_ gmap Data flow Figure 12 General architecture of the...

Страница 29: ...ormat the stream is assumed to be compressed according to the corresponding format A filter task will then be used to process it accordingly if the format is implemented in Scotch and enabled on your...

Страница 30: ...te way between algorithmically coded built in target architectures and decompositions computed by mapping with amk grf Like built in target architectures their decompositions are algorithmically compu...

Страница 31: ...of a multi user parallel machine As a matter of fact if the yet unallocated part of the machine is represented by a source graph with n vertices and n processors are requested by a user in order to ru...

Страница 32: ...the context of multi user parallel ma chines On these machines when users request processors in order to run their jobs the partitions allocated by the operating system may not be regular nor connect...

Страница 33: ...le whenever geometry data is available At the time being it accepts four input formats the Matrix Market format 5 the Harwell Boeing col lection format 10 the Chaco MeTiS graph format 24 and the Scotc...

Страница 34: ...s Avail able bipartitioning methods include a multi level algorithm that uses other bipartitioning methods to compute the initial and refined bipartitions an improved implementation of the Fiduccia Ma...

Страница 35: ...mapping strategy strat The format of mapping strategies is de fined in section 7 3 2 This option is incompatible with options b and c sobj Mask source edge and vertex weights This option allows the u...

Страница 36: ...is labeled posY dimX posX Program gmk m3 outputs the source file of a tridimensional mesh with dimZ layers of dimY rows by dimX columns If the t option is set tori are built instead of meshes The vert...

Страница 37: ...f messages that have to be sent to exchange data between all neighboring blocks The second communication line gives the average dilation of the edges followed by the sum of all edge dilations The thir...

Страница 38: ...he graphs to order are very large the same results can be obtained by using the dgord parallel program of the PT Scotch distribution which can read centralized graph files too Options Since the progra...

Страница 39: ...following switches s Strategy information This parameter displays the ordering strategy which will be used by gord t Timing information 6 3 11 gotst Synopsis gotst input graph file input ordering file...

Страница 40: ...e result of the mapping of a subgraph of the bidimensional mesh M2 4 4 onto the complete graph K 2 can be displayed on the whole M2 4 4 graph and Figure 14 c shows how the display of the same mapping...

Страница 41: ...for display by the ivview program 40 The optional pa rameters are given below c Color output using 16 different colors Opposite of g g Grey level output using 8 different levels Opposite of c r Remov...

Страница 42: ...output suitable for direct printing Oppo site of e g Grey level PostScript output Opposite of c l Large clipping Mapping disks are included in the clipping area computation Opposite of s r Remove cut...

Страница 43: ...geometry file options Description The program mcv is the source mesh converter It takes on input a mesh file of the format specified with the i option and outputs its equivalent in the format specifie...

Страница 44: ...m3 outputs the source file of a tridimensional mesh with dimX dimY dimZ elements and dimX 1 dimY 1 dimZ 1 nodes Options goutput geometry file Output mesh geometry to file output geometry file for mmk...

Страница 45: ...he mapping of mesh node vertices to col umn blocks All of the separators and leaves produced by the nested dissection method are considered as distinct column blocks which may be in turn split by the...

Страница 46: ...s and element and node degrees Options h Display the program synopsis V Print the program version and copyright 7 Library All of the features provided by the programs of the Scotch distribution may be...

Страница 47: ...from a stream and so on Typically functions that return an error code return zero if the function suc ceeds and a non zero value in case of error For instance the SCOTCH graphInit and SCOTCH graphLoad...

Страница 48: ...called PXFFILENO in the normalized POSIX Fortran API and files which use it should include the USE IFPOSIX direc tive whenever necessary An alternate non normalized function also exists in most Unix...

Страница 49: ...for all graph related values in accordance to the size of the SCOTCH Num type as set by the DINTSIZEx compilation flags Also the INTEGER idx type represents an integer type of a size equivalent to the...

Страница 50: ...aph is twice the number of graph edges verttab Array of start indices in edgetab of vertex adjacency sub arrays vendtab Array of after last indices in edgetab of vertex adjacency sub arrays For any ve...

Страница 51: ...s bold numbers close to vertices are vertex loads and numbers close to edges are edge loads Since the edge array is compact verttab is of size vertnbr 1 and vendtab points to verttab 1 edgetab verttab...

Страница 52: ...he adjacencies of its neighbor vertices must also be updated to account for it If free space had been reserved at the end of each of the neighbors one just has to increment the vendtab i values of eve...

Страница 53: ...er verttab baseval baseval and verttab baseval vertnbr baseval edgenbr velotab Array of size vertnbr holding the integer load associated with each vertex As for graphs it is possible to handle elegant...

Страница 54: ...de of a single array of double precision values which represent the coordinates of the vertices of a graph or of the node vertices of a mesh in vertex order The fields of a geometry structure are the...

Страница 55: ...hing of the mesh of Figure 19 New node vertices have been added at the end of the vertex sub array new elements have been added at the beginning of the element sub array and vertex base values have be...

Страница 56: ...ber of column blocks that is supervariables in the block ordering rangtab Array of ranges for the column blocks Column block c with baseval c cblknbr baseval contains columns with indices ranging from...

Страница 57: ...s is without further parametrization this object will be filled with a default strategy when passing it as a parameter to the next partitioning or ordering routine to be called On return the strategy...

Страница 58: ...1 0 Coars ening stops when either the coarsening ratio is above the maximum coars ening ratio or the graph has fewer vertices than the minimum number of vertices allowed type type Set the type of matc...

Страница 59: ...strings A graph bipartitioning strategy is made of one or several graph bipartitioning meth ods which can be combined by means of strategy operators Strategy operators are listed below by increasing...

Страница 60: ...rated by commas and the whole list be enclosed between curly braces The currently available graph bipartitioning methods are the following b Band method This method builds a band graph of given width...

Страница 61: ...dif and rem parameters must be equal to 1 but in order to speed up the diffusion process other combi nations of higher sum can be tried In this case the number of passes must be kept low to avoid num...

Страница 62: ...sed low strat Set the strategy that is used to compute the partition of the coarsest graph at the lowest level of the coarsening process rat rat Set the threshold maximum coarsening ratio over which g...

Страница 63: ...cond1 and cond2 are true cond Logical not operator The result of the condition is true only if cond is false var relop val Relational operator where var is a node variable val is either a node variab...

Страница 64: ...n computed c Compression method 2 The parameters of the compression method are listed below rat rat Set the compression ratio over which graphs and meshes will not be compressed Useful values range be...

Страница 65: ...nt of extra diagonal blocks If the number of extra diagonal blocks is not relevant the s method should be preferred This method has only one parameter pass nbr Set the number of sweeps performed by th...

Страница 66: ...used should compute an initial separation from scratch and every following method should use the result of the previous one as a starting point strat Grouping operator The strategy enclosed within th...

Страница 67: ...lgorithms in a multi level context but it improves partition quality too The parameters of the band separation method are listed below bnd strat Set the vertex separation strategy to be used on the ba...

Страница 68: ...ccia Mattheyses algorithm repeatedly moves vertices from the separator to any of the two parts so as to minimize the size of the separator A pass completes either when all of the vertices have been mo...

Страница 69: ...ccia Mattheyses algorithm with move 0 v Mesh to graph method Available only for mesh separation strategies From the mesh to which this method applies is derived a graph such that a graph vertex is ass...

Страница 70: ...al structures Return values SCOTCH archInit returns 0 if the graph structure has been successfully ini tialized and 1 else 7 4 2 SCOTCH archExit Synopsis void SCOTCH archExit SCOTCH Arch archptr scotc...

Страница 71: ...eprecision archdat integer fildes integer ierr Description The SCOTCH archSave routine saves the contents of the SCOTCH Arch structure pointed to by archptr to stream stream in the Scotch target archi...

Страница 72: ...e function returns the number of nodes of the given tar get architecture The Fortran routine has a second parameter of integer type which is set on return with the number of nodes of the target archit...

Страница 73: ...rchitecture from source graphs available at page 32 Return values SCOTCH archBuild returns 0 if the decomposition defined architecture has been successfully computed and 1 else 7 4 8 SCOTCH archCmplt...

Страница 74: ...archptr const SCOTCH Num hdimval scotchfarchhcub doubleprecision archdat integer num hdimval integer ierr Description The SCOTCH archHcub routine fills the SCOTCH Arch structure pointed to by archptr...

Страница 75: ...dimval ydimval zdimval processors Return values SCOTCH archMesh3D returns 0 if the 3D mesh target architecture has been successfully built and 1 else 7 4 13 SCOTCH archTleaf Synopsis int SCOTCH archTl...

Страница 76: ...r Description The SCOTCH archTorus2D routine fills the SCOTCH Arch structure pointed to by archptr with the description of a 2D torus architecture with xdimval ydimval processors Return values SCOTCH...

Страница 77: ...no longer of use call function SCOTCH graphExit to free its internal structures Return values SCOTCH graphInit returns 0 if the graph structure has been successfully ini tialized and 1 else 7 5 2 SCO...

Страница 78: ...ng of source graph files by programs written in C as well as in Fortran the base value of the graph to read can be set to 0 or 1 by setting the baseval parameter to the proper value A value of 1 indic...

Страница 79: ...it of the graph file Return values SCOTCH graphSave returns 0 if the graph structure has been successfully writ ten to stream and 1 else 7 5 6 SCOTCH graphBuild Synopsis int SCOTCH graphBuild SCOTCH G...

Страница 80: ...elds makes them be considered as missing arrays The same holds for edlotab when it is passed a reference equal to edgetab Setting vendtab to refer to one cell after verttab yields the same result as i...

Страница 81: ...ven SCOTCH Graph structure It can be used in client applications to determine if a graph that has been created from used generated data by means of the SCOTCH graphBuild routine is consistent prior to...

Страница 82: ...dx integer num edgenbr integer idx edgeidx integer num edloidx Description The SCOTCH graphData routine is the dual of the SCOTCH graphBuild routine It is a multiple accessor that returns scalar value...

Страница 83: ...do not exist For instance if some base array myarray 1 is passed as parameter indxtab then the first cell of array verttab will be accessible as myarray vertidx In order for this feature to behave pr...

Страница 84: ...ly degrmin degrmax degravg and degrdlt are the minimum ver tex degree the maximum vertex degree the average vertex degree and the variance of the vertex degrees respectively edlomin edlomax edlosum ed...

Страница 85: ...onst SCOTCH Strat straptr SCOTCH Num parttab scotchfgraphmap doubleprecision grafdat doubleprecision archdat doubleprecision stradat integer num parttab integer ierr Description The SCOTCH graphMap ro...

Страница 86: ...by grafptr and which will receive the indices of the vertices of the target architecture pointed to by archptr It should be the first function to be called upon a SCOTCH Mapping structure When the map...

Страница 87: ...OTCH graphMapLoad returns 0 if the mapping structure has been success fully loaded from stream and 1 else 7 6 6 SCOTCH graphMapSave Synopsis int SCOTCH graphMapSave const SCOTCH Graph grafptr const SC...

Страница 88: ...values SCOTCH graphMapCompute returns 0 if the mapping has been successfully com puted and 1 else In this latter case the mapping array may however have been partially or completely filled but its con...

Страница 89: ...ure pointed to by grafptr using the ordering strategy pointed to by stratptr and returns ordering data in the scalar pointed to by cblkptr and the four arrays permtab peritab rangtab and treetab The p...

Страница 90: ...ly filled but their contents are not significant 7 7 2 SCOTCH graphOrderInit Synopsis int SCOTCH graphOrderInit const SCOTCH Graph grafptr SCOTCH Ordering ordeptr SCOTCH Num permtab SCOTCH Num peritab...

Страница 91: ...erexit doubleprecision grafdat doubleprecision ordedat Description The SCOTCH graphOrderExit function frees the contents of a SCOTCH Ordering structure previously initialized by SCOTCH graphOrderInit...

Страница 92: ...nix file descriptor fildes associated with the logical unit of the ordering file Return values SCOTCH graphOrderSave returns 0 if the ordering structure has been success fully written to stream and 1...

Страница 93: ...sociated with the SCOTCH Ordering structure pointed to by ordeptr to stream stream The format of the tree output file resembles the one of a mapping or ordering file it is made up of as many lines as...

Страница 94: ...rategy pointed to by stratptr and stores its result in the ordering structure pointed to by ordeptr On return the ordering structure holds a block ordering of the given graph see section 7 7 2 for a d...

Страница 95: ...n induced ver tex are ordered consecutively with the highest available indices Conse quently the permuted indices of induced vertices range from baseval to listnbr baseval 1 while the permuted indices...

Страница 96: ...num baseval integer ierr Description The SCOTCH meshLoad routine fills the SCOTCH Mesh structure pointed to by meshptr with the source mesh description available from stream stream in the Scotch mesh...

Страница 97: ...tions to obtain the number of the Unix file descriptor fildes associated with the logical unit of the mesh file Return values SCOTCH meshSave returns 0 if the mesh structure has been successfully writ...

Страница 98: ...ltab is the vertex label array of size velmnbr vnodnbr if it exists edgenbr is the number of arcs that is twice the number of edges edgetab is the adjacency array of size at least edgenbr it can be mo...

Страница 99: ...nsistent prior to calling any other routines of the libScotch library Return values SCOTCH meshCheck returns 0 if mesh data are consistent and 1 else 7 8 7 SCOTCH meshSize Synopsis void SCOTCH meshSiz...

Страница 100: ...vertidx integer idx vendidx integer idx veloidx integer idx vnloidx integer idx vlblidx integer num edgenbr integer idx edgeidx integer num degrmax Description The SCOTCH meshData routine is the dual...

Страница 101: ...y indices are computed Therefore instead of returning references the routine returns integers which represent the starting index of each of the relevant arrays with respect to the base input array or...

Страница 102: ...x degree the average element vertex degree and the variance of the element vertex degrees respectively ndegmin ndegmax ndegavg and ndegdlt are the minimum element vertex degree the maximum element ver...

Страница 103: ...um rangtab SCOTCH Num treetab scotchfmeshorder doubleprecision meshdat doubleprecision stradat integer num permtab integer num peritab integer num cblknbr integer num rangtab integer num treetab integ...

Страница 104: ...number of column blocks of the produced ordering and rangtab holds the starting indices of each of the permuted column blocks in increasing order so that column block i starts at index rangtab i and e...

Страница 105: ...OTCH meshOrderInit routine should be the first function to be called upon a SCOTCH Ordering structure for ordering meshes When the ordering structure is no longer of use the SCOTCH meshOrderExit funct...

Страница 106: ...ed to by ordeptr to stream stream in the Scotch mapping format see section 5 5 A target domain number is associated with every block such that all node vertices belonging to the same block are shown a...

Страница 107: ...fildes associated with the logical unit of the tree mapping file Return values SCOTCH meshOrderSaveTreereturns 0 if the separators tree structure has been successfully written to stream and 1 else 7 9...

Страница 108: ...it SCOTCH Strat straptr scotchfstratinit doubleprecision stradat integer ierr Description The SCOTCH stratInit function initializes a SCOTCH Strat structure so as to make it suitable for future operat...

Страница 109: ...h the logical unit of the output file Return values SCOTCH stratSave returns 0 if the strategy string has been successfully writ ten to stream and 1 else 7 10 4 SCOTCH stratGraphBipart Synopsis int SC...

Страница 110: ...lse 7 10 6 SCOTCH stratGraphMapBuild Synopsis int SCOTCH stratGraphMapBuild SCOTCH Strat straptr const SCOTCH Num flagval const SCOTCH Num partnbr const double balrat scotchfstratgraphmapbuild doublep...

Страница 111: ...s been successfully set and 1 else 7 10 8 SCOTCH stratGraphOrderBuild Synopsis int SCOTCH stratGraphOrderBuild SCOTCH Strat straptr const SCOTCH Num flagval const double balrat scotchfstratgraphorderb...

Страница 112: ...successfully set and 1 else 7 10 10 SCOTCH stratMeshOrderBuild Synopsis int SCOTCH stratMeshOrderBuild SCOTCH Strat straptr const SCOTCH Num flagval const double balrat scotchfstratmeshorderbuild dou...

Страница 113: ...utines to be able to read their data on the fly from streams that can only be read once such as communication pipes Having both aspects taken into account in a single call makes the writing of file co...

Страница 114: ...ta will be written Since there are no pointers in Fortran a specific mechanism is used to allow users to access the coordinate array The scotchfgeomdata routine is passed an integer array the first el...

Страница 115: ...andle geometry data the geomptr and geomstream fields are not used as well as the string field Fortran users must use the PXFFILENO or FNUM functions to obtain the number of the Unix file descriptor g...

Страница 116: ...geomdat integer graffildes integer geomfildes character string Description The SCOTCH graphGeomLoadHabo routine fills the SCOTCH Graph structure pointed to by grafptr with the source graph description...

Страница 117: ...e Unix file descriptors graffildes and geomfildes associated with the logical units of the graph and geometry files Return values SCOTCH graphGeomLoadScot returns 0 if the graph topology and geometry...

Страница 118: ...the source mesh description available from stream meshstream in the Harwell Boeing square elemental matrix format 10 Since this mesh format does not handle geometry data the geomptr and geom stream fi...

Страница 119: ...nd filled with the data read and 1 else 7 11 11 SCOTCH meshGeomSaveScot Synopsis int SCOTCH meshGeomSaveScot const SCOTCH Mesh meshptr const SCOTCH Geom geomptr FILE meshstream FILE geomstream const c...

Страница 120: ...s function has returned In order to free the user from the burden of writing a basic error handler from scratch the libscotcherr a library provides error routines that print error messages on the stan...

Страница 121: ...y to compute the results 7 14 MeTiS compatibility library The MeTiS compatibility library provides stubs which redirect some calls to MeTiS routines to the corresponding Scotch counterparts In order t...

Страница 122: ...d METIS NodeWND call the same Scotch routine which uses the Scotch default ordering strategy proved to be efficient in most cases 7 14 2 METIS NodeND Synopsis void METIS NodeND const int const n const...

Страница 123: ...flag integer options integer perm integer iperm Description The METIS NodeWND function performs a nested dissection ordering of the graph passed as arrays xadj adjncy and vwgt using the default Scotch...

Страница 124: ...of the graph represented by arrays xadj adjncy vwgt and adjwgt using the default Scotch mapping strategy The options array is not used The part array has the same meaning as the parttab array of Scot...

Страница 125: ...essing which increases running time to a small extent All of the three MeTiS stubs METIS PartGraphKway METIS PartGraph Recursive and METIS PartGraphVKway call the same Scotch routine which uses the Sc...

Страница 126: ...efficient in most cases 8 Installation Version 5 1 of the Scotch software package is distributed as free libre software under the CeCILL C free libre software license 6 which is very similar to the GN...

Страница 127: ...I conflicts the MeTiS compatibility library will not be usable It is usually safer and cleaner to tune your C and Fortran compilers to make them inter pret int and INTEGER types as 32 or 64 bit values...

Страница 128: ...map gmk m2 32 32 gmap tgt h8 tgt tmp brol map Build the Open Inventor file graph iv that contains the display of a source graph the source and geometry files of which are named graph grf and graph xyz...

Страница 129: ...tion must be placed before the lmetis one so that routines that are redefined by Scotch are selected instead of their MeTiS counterpart When no other MeTiS routines than the ones re defined by Scotch...

Страница 130: ...while refinement meth ods must be provided an existing partition to improve In addition to the topological description of the underlying graph the working graph and mesh structures comprise variables...

Страница 131: ...stands for strat egy First edit vgraph separate st h In the VgraphSeparateStMethodType enumeration add a line for your new method VGRAPHSEPASTMETHXY Then edit vgraph separate st c where all of the re...

Страница 132: ...rder c since it is the graph ordering routine which makes use of graph vertex separation methods to compute separators for the nested dissection ordering method 10 4 Licensing of new methods and of de...

Страница 133: ...ngton The Matrix Market exchange formats initial design NISTIR 5935 National Institute of Standards and Technology December 1996 6 CeCILL CEA CNRS INRIA Logiciel Libre free libre software license Avai...

Страница 134: ...hms for sparse matrix factorization IEEE Trans Parallel Distrib Syst 8 5 502 520 1997 21 S W Hammond Mapping unstructured grid computations to massively parallel computers PhD thesis Rensselaer Polyte...

Страница 135: ...ptember 1998 35 B W Kernighan and S Lin An efficient heuristic procedure for partitionning graphs BELL System Technical Journal pages 291 307 February 1970 36 M Laguna T A Feo and H C Elrod A greedy r...

Страница 136: ...e matrices with eigenvectors of graphs SIAM Journal of Matrix Analysis 11 3 430 452 July 1990 50 E Rothberg Performance of panel and block approaches to sparse Cholesky factorization on the iPSC 860 a...

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