| 1 | /* |
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| 2 | * mutil.c |
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| 3 | * |
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| 4 | * This file contains various utility functions for the MOC portion of the |
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| 5 | * code |
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| 6 | * |
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| 7 | * Started 2/15/98 |
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| 8 | * George |
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| 9 | * |
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| 10 | * $Id: mutil.c,v 1.1 1998/11/27 17:59:27 karypis Exp $ |
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| 11 | * |
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| 12 | */ |
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| 13 | |
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| 14 | #include <metis.h> |
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| 15 | |
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| 16 | |
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| 17 | /************************************************************************* |
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| 18 | * This function checks if the vertex weights of two vertices are below |
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| 19 | * a given set of values |
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| 20 | **************************************************************************/ |
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| 21 | int AreAllVwgtsBelow(int ncon, float alpha, float *vwgt1, float beta, float *vwgt2, float limit) |
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| 22 | { |
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| 23 | int i; |
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| 24 | |
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| 25 | for (i=0; i<ncon; i++) |
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| 26 | if (alpha*vwgt1[i] + beta*vwgt2[i] > limit) |
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| 27 | return 0; |
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| 28 | |
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| 29 | return 1; |
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| 30 | } |
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| 31 | |
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| 32 | |
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| 33 | /************************************************************************* |
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| 34 | * This function checks if the vertex weights of two vertices are below |
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| 35 | * a given set of values |
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| 36 | **************************************************************************/ |
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| 37 | int AreAnyVwgtsBelow(int ncon, float alpha, float *vwgt1, float beta, float *vwgt2, float limit) |
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| 38 | { |
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| 39 | int i; |
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| 40 | |
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| 41 | for (i=0; i<ncon; i++) |
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| 42 | if (alpha*vwgt1[i] + beta*vwgt2[i] < limit) |
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| 43 | return 1; |
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| 44 | |
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| 45 | return 0; |
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| 46 | } |
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| 47 | |
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| 48 | |
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| 49 | |
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| 50 | /************************************************************************* |
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| 51 | * This function checks if the vertex weights of two vertices are above |
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| 52 | * a given set of values |
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| 53 | **************************************************************************/ |
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| 54 | int AreAllVwgtsAbove(int ncon, float alpha, float *vwgt1, float beta, float *vwgt2, float limit) |
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| 55 | { |
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| 56 | int i; |
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| 57 | |
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| 58 | for (i=0; i<ncon; i++) |
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| 59 | if (alpha*vwgt1[i] + beta*vwgt2[i] < limit) |
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| 60 | return 0; |
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| 61 | |
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| 62 | return 1; |
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| 63 | } |
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| 64 | |
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| 65 | |
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| 66 | /************************************************************************* |
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| 67 | * This function computes the load imbalance over all the constrains |
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| 68 | * For now assume that we just want balanced partitionings |
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| 69 | **************************************************************************/ |
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| 70 | float ComputeLoadImbalance(int ncon, int nparts, float *npwgts, float *tpwgts) |
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| 71 | { |
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| 72 | int i, j; |
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| 73 | float max, lb=0.0; |
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| 74 | |
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| 75 | for (i=0; i<ncon; i++) { |
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| 76 | max = 0.0; |
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| 77 | for (j=0; j<nparts; j++) { |
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| 78 | if (npwgts[j*ncon+i] > max) |
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| 79 | max = npwgts[j*ncon+i]; |
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| 80 | } |
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| 81 | if (max*nparts > lb) |
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| 82 | lb = max*nparts; |
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| 83 | } |
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| 84 | |
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| 85 | return lb; |
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| 86 | } |
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| 87 | |
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| 88 | /************************************************************************* |
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| 89 | * This function checks if the vertex weights of two vertices are below |
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| 90 | * a given set of values |
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| 91 | **************************************************************************/ |
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| 92 | int AreAllBelow(int ncon, float *v1, float *v2) |
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| 93 | { |
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| 94 | int i; |
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| 95 | |
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| 96 | for (i=0; i<ncon; i++) |
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| 97 | if (v1[i] > v2[i]) |
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| 98 | return 0; |
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| 99 | |
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| 100 | return 1; |
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| 101 | } |
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