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Old 03-20-2013, 05:37 PM   #1
ejspeiro
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Registered: Feb 2011
Location: San Diego, California (92115), U.S.A.
Distribution: Ubuntu 14.04 LTS (Trusty Tahr)
Posts: 201

Rep: Reputation: 26
C/Fotran hybrid code using MPI/ScaLAPACK seg faults in a weird way


Hello,

As many of you have probably read, I managed to get this C/Fortran interaction problem kind of solved in a previous thread.

As I mentioned in that last thread, I am trying to translate this CODE from Fortran into C.

This is what I have so far:

Code:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>

#include "mpi.h"

#define PRINT_NOTHING             0
#define PRINT_UP_TO_MESGS         1
#define PRINT_UP_TO_ARRAYS        2
#define PRINT_UP_TO_MATRICES      3
#define PRINT_LEVEL               PRINT_UP_TO_MATRICES

/*! Parameters: */
#define TOTMEM                    425053208
#define INTMEM                    13107200
#define NTESTS                    20
#define DLEN_                     9
#define DBLESZ                    8               /*! Size of a DOUBLE PRE. */
#define MEMSIZ                    425053208/8     /*! Memory for DOUBLE PRE. */

#define MASTER                    0
#define MPI_ERROR_CODE_ERROR_GRID 1
#define MPI_ERROR_CODE_NOT_FACT   2
#define MPI_ERROR_CODE_NOT_SOLVE  3

#define BLACS_USER_WONT_FIN_MPI   0
#define BLACS_USER_WILL_FIN_MPI   1

#define DESCRIPTOR_SIZE           7

typedef enum {
  FALSE,
  TRUE
  
} logical;

/*! External subroutines: */
extern void Cblacs_barrier  (int context,
                             char* scope);
extern void Cblacs_exit     (int doneflag);
extern void Cblacs_get      (int ,
                             int ,
                             int *context);
extern void Cblacs_gridexit (int context);
extern void Cblacs_gridinfo (int context,
                             int *our_nprow,
                             int *our_npcol,
                             int *my_prow,
                             int *my_pcol);
extern void Cblacs_gridinit (int* context,
                             char* order,
                             int nproc_rows,
                             int nproc_cols);
extern void Cblacs_pinfo    (int *my_blacs_pid,
                             int *our_blacs_nprocs);

/* http://www.netlib.org/scalapack/explore-html/dd/d22/descinit_8f.html */
extern void descinit_       (int *desc,
                             int *m,
                             int *n,
                             int *mb,
                             int *nb,
                             int *irsrc,
                             int *icsrc,
                             int *ictxt,
                             int *lld,
                             int *info);
/* http://www.netlib.org/scalapack/explore-html/dc/d44/igsum2d___8c.html */
extern void igsum2d_        (int *contxt,
                             char *scope,
                             char *top,
                             int *m,
                             int *n,
                             int *a,
                             int *lda,
                             int *rdest,
                             int *cdest);
/* http://www.netlib.org/scalapack/explore-html/db/da1/pdbmatgen_8f.html */
extern void pdbmatgen_      (int *ictxt,
                             char *aform,
                             char *aform2,
                             int *bwl,
                             int *bwu,
                             int *n,
                             int *mb,
                             int *nb,
                             double *a,
                             int *lda,
                             int *iarow,
                             int *iacol,
                             int *iseed,
                             int *myrow,
                             int *mycol,
                             int *nprow,
                             int *npcol);
/* http://www.netlib.org/scalapack/explore-html/d8/dba/pdchekpad_8f.html */
extern void pdchekpad_      (int * ictxt,
                             char *mess,
                             int *m,
                             int *n,
                             double *a,
                             int *lda,
                             int *ipre,
                             int *ipost,
                             double *chkval);
/* http://www.netlib.org/scalapack/explore-html/d2/dc2/pddblaschk_8f.html */
extern void pddblaschk_     (char *symm,
                             char *uplo,
                             char *trans,
                             int *n,
                             int *bwl,
                             int *bwu,
                             int *nrhs,
                             double *x,
                             int *ix,
                             int *jx,
                             int *descx,
                             int *iaseed,
                             double *a,
                             int *ia,
                             int *ja,
                             int *desca,
                             int *ibseed,
                             double *anorm,
                             double *resid,
                             double *work,
                             int *worksiz);
/* http://www.netlib.org/scalapack/explore-html/d6/d3b/pdfillpad_8f.html */
extern void pdfillpad_      (int *ictxt,
                             int *m,
                             int *n,
                             double *a,
                             int *lda,
                             int *ipre,
                             int *ipost,
                             double *chkval);
/* http://www.netlib.org/scalapack/explore-html/d0/d2b/pdgbinfo_8f.html */
extern void pdgbinfo_       (char *summry,
                             int *nout,
                             char *trans,
                             int *nmat,
                             int *nval,
                             int *ldnval,
                             int *nbw,
                             int *bwlval,
                             int *bwuval,
                             int *ldbwval,
                             int *nnb,
                             int *nbval,
                             int *ldnbval,
                             int *nnr,
                             int *nrval,
                             int *ldnrval,
                             int *nnbr,
                             int *nbrval,
                             int *ldnbrval,
                             int *ngrids,
                             int *pval,
                             int *ldpval,
                             int *qval,
                             int *ldqval,
                             float *thresh,
                            
                             double *work,  /* Array to gather and bcast. */
                            
                             int *iam,
                             int *nprocs);
/* http://www.netlib.org/scalapack/explore-html/dd/dad/pdgbtrf_8f.html */
extern void pdgbtrf_        (int *n,
                             int *bwl,
                             int *bwu,
                             double *a,
                             int *ja,
                             int *desca,
                             int *ipiv,
                             double *af,
                             int *laf,
                             double *work,
                             int *lwork,
                             int *info);
/* http://www.netlib.org/scalapack/explore-html/d9/dda/pdgbtrs_8f.html */
extern void pdgbtrs_        (char *trans,
                             int *n,
                             int *bwl,
                             int *bwu,
                             int *nrhs,
                             double *a,
                             int *ja,
                             int *desca,
                             int *ipiv,
                             double *b,
                             int *ib,
                             int *descb,
                             double *af,
                             int *laf,
                             double *work,
                             int *lwork,
                             int *info);
/*
http://www.netlib.org/scalapack/explore-html/d2/d66/_e_i_g_2pdmatgen_8f.html
*/
extern void pdmatgen_       (int *ictxt,
                             char *aform,
                             char *diag,
                             int *m,
                             int *n,
                             int *mb,
                             int *nb,
                             double *a,
                             int *lda,
                             int *iarow,
                             int *iacol,
                             int *iseed,
                             int *iroff,
                             int *irnum,
                             int *icoff,
                             int *icnum,
                             int *myrow,
                             int *mycol,
                             int *nprow,
                             int *npcol);
/* http://www.netlib.org/scalapack/explore-html/d2/dcd/sltimer_8f_source.html */
extern void slboot_         (void);
extern void slcombine_      (int *ictxt,
                             char *scope,
                             char *op,
                             char *timetype,
                             int *n,
                             int *ibeg,
                             double *times);
extern void sltimer_        ( int *i );

/*! External functions: */
/* http://www.netlib.org/scalapack/explore-html/d4/d48/numroc_8f.html */
extern int numroc_      (int *n,
                         int *nb,
                         int *iproc,
                         int *isrcproc,
                         int *nprocs);
/* http://www.netlib.org/scalapack/explore-html/df/dee/tools_8f.html#a67ae4efe5110e3297b1e9e3a46d8c78b */
extern logical lsame_   (char *ca,
                         char *cb);
/* http://www.netlib.org/scalapack/explore-html/db/dd0/pdlange_8f.html */
extern double pdlange_  (char *norm,
                         int *m,
                         int *n,
                         double *a,
                         int *ia,
                         int *ja,
                         int *desca,
                         double *work );

/*! Intrinsic functions: */
/*       INTRINSIC          DBLE, MAX, MIN, MOD */
inline double DBLE(int xx) { return (double) xx; }
inline double MAX(double xx, double yy) { return xx >= yy? xx: yy; }
inline double MIN(double xx, double yy) { return xx <= yy? xx: yy; }
inline int MOD(int xx, int yy) { return xx%yy; }

/*! PROGRAM PDGBDRIVER: */
int main (int argc, char **argv) {

  /*! Parameters: */
  int ntests = NTESTS;  /* Number of num. tests to be performed */
  //   int       BLOCK_CYCLIC_2D = 1;
  //   int       DTYPE_ = 1;
  //   int       CTXT_ = 2;
  //   int       M_ = 3;
  //   int       N_ = 4;
  //   int       MB_ = 5;
  //   int       NB_ = 6;
  //   int       RSRC_ = 7;
  //   int       CSRC_ = 8;
  //   int       LLD_ = 9;
  //
  //   double    ZERO = 0.0;
  //   double    PADVAL = -9923.0;
  //
  //   int       INT_ONE = 1;
  
  /*! Local scalars: */
  logical   CHECK;        /* Should or shouldn't I perform the num. tests? */
  char      TRANS;        /* Should I transpose the matrix? */
  //   char      PASSED[6];
  char      OUTFILE[80];  /* ? */
  //   int       BWL;
  //   int       BWU;
  //   int       BW_NUM;
  //   int       FILLIN_SIZE;
  //   int       FREE_PTR;
  //   int       H;
  //   int       HH;
  int       I;          /* Iterator per process grid. */
  int       IAM;          /* My MPI process ID. */
  int       IASEED;       /* Seed for random matrix A creation. */
  int       IBSEED;       /* Seed for random matrix B creation. */
  //   int       ICTXT;
  //   int       ICTXTB;
  //   int       IERR_TEMP;
  //   int       IMIDPAD;
  //   int       INFO;
  //   int       IPA;
  //   int       IPB;
  //   int       IPOSTPAD;
  //   int       IPREPAD;
  //   int       IPW;
  //   int       IPW_SIZE;
  //   int       IPW_SOLVE;
  //   int       IPW_SOLVE_SIZE;
  //   int       IP_DRIVER_W;
  //   int       IP_FILLIN;
  //   int       J;
  //   int       K;
  
  /*! Data statements: */
  //   int       KFAIL = 4;
  //   int       KPASS = 4;
  //   int       KSKIP = 4;
  //   int       KTESTS = 4;
  
  /*! Local scalars: (continued) */
  //   int       MYCOL;
  //   int       MYRHS_SIZE;
  //   int       MYROW;
  //   int       N;
  //   int       NB;
  int       NBW;    /* Number of bandwith values per matrix. */
  int       NGRIDS; /* Number of process grids to try for. */
  int       NMAT;   /* Number of matrices  */
  int       NNB;    /* Number of sizes of NB (block column size). */
  int       NNBR;
  int       NNR;
  int       NOUT;   /* Device out... o.O */
  //   int       NP;
  int       NPCOL;  /* Procs per row in processors grid/ */
  int       NPROCS; /* The size of OUR communicator. */
  //   int       NPROCS_REAL;
  int       NPROW;  /* Procs per row in processors grid/ */
  //   int       NQ;
  //   int       NRHS;
  //   int       N_FIRST;
  //   int       N_LAST;
  //   int       WORKSIZ;
  
  float     THRESH; /* Threshold variable for numerical tests. */
  
  //   double    ANORM;
  //   double    NOPS;
  //   double    NOPS2;
  //   double    SRESID;
  //   double    TMFLOPS;
  //   double    TMFLOPS2;
  
  /*! Local arrays: */
  //   int       IPIV[INTMEM];
  int       BWLVAL[NTESTS];  /* Values of lower diagonals per matrix. */
  int       BWUVAL[NTESTS];  /* Values of upper diagonals per matrix. */
  //   int       DESCA[7];
  //   int       DESCA2D[DLEN_];
  //   int       DESCB[7];
  //   int       DESCB2D[DLEN_];
  //   int       IERR[1];
  int       NBRVAL[NTESTS]; /* ? */
  int       NBVAL[NTESTS];  /* Column sizes per matrix. */
  int       NRVAL[NTESTS];  /* ? */
  int       NVAL[NTESTS];   /* Values of N for a given matrix. */
  int       PVAL[NTESTS];   /* Values for proc. rows. */
  int       QVAL[NTESTS];   /* Values for proc. cols. */
  
  //   double    CTIME[2];
  double    *MEM;      /* GLOABL array for broadcasting the information. */
  //   double    WTIME[2];

  /*! Executable statements: */

  /*! Get starting information: */
  Cblacs_pinfo(&IAM, &NPROCS);
  IASEED = 100;
  IBSEED = 200;

  MEM = (double *) malloc(MEMSIZ);
  
  pdgbinfo_(OUTFILE, &NOUT, &TRANS, &NMAT, NVAL, &ntests, &NBW,
            BWLVAL, BWUVAL, &ntests, &NNB, NBVAL, &ntests, &NNR,
            NRVAL, &ntests, &NNBR, NBRVAL, &ntests, &NGRIDS, PVAL,
            &ntests, QVAL, &ntests, &THRESH, MEM, &IAM, &NPROCS);

  CHECK = (THRESH >= 0.0f);

  /*! Print headings: */
  fprintf(stdout, "\n");
  fprintf(stdout, "TIME TR      N  BWL BWU    NB  NRHS    P    Q L*U Time Slv Time   MFLOPS   MFLOP2  CHECK\n");
  fprintf(stdout, "---- -- ------  --- ---  ---- ----- ---- ---- -------- -------- -------- -------- ------\n");
  fprintf(stdout, "\n");
  fflush(stdout);

  /*! Loop over different process grids: */
  for (I = 1; I <= NGRIDS; I++) {

    NPROW = PVAL[I - 1];
    NPCOL = QVAL[I - 1];

    fprintf(stdout, "Solving for a %d x %d grid!\n", NPROW, NPCOL);
  }

  free(MEM);
  Cblacs_exit(0);
  exit(EXIT_SUCCESS);
}
Please excuse the amount of commented-out variables, but like I said, I am basically translating the reference driver, from scratch.

My problem is that it suddenly started seg-faulting, as soon as I wrote the for loop... it was working before. That is a clear sign of a funky memory manipulation issue, which probably arises from issues related to the memory management differences between C and Fortran.

At least, that is my guess.

Does anybody has a clue on what may be going wrong?

Thanks in advanced!
 
Old 03-20-2013, 06:17 PM   #2
ejspeiro
Member
 
Registered: Feb 2011
Location: San Diego, California (92115), U.S.A.
Distribution: Ubuntu 14.04 LTS (Trusty Tahr)
Posts: 201

Original Poster
Rep: Reputation: 26
This is what I mean with "weird": I deleted the loop, and added printing statement for the variable MEM:

Code:
...
  pdgbinfo_(OUTFILE, &NOUT, &TRANS, &NMAT, NVAL, &ntests, &NBW,
            BWLVAL, BWUVAL, &ntests, &NNB, NBVAL, &ntests, &NNR,
            NRVAL, &ntests, &NNBR, NBRVAL, &ntests, &NGRIDS, PVAL,
            &ntests, QVAL, &ntests, &THRESH, MEM, &IAM, &NPROCS);

  fprintf(stdout, "MEM 1 = %g\n", MEM[0]);
  fprintf(stdout, "MEM 2 = %g\n", MEM[1]);
  fprintf(stdout, "MEM 3 = %g\n", MEM[2]);
  fprintf(stdout, "MEM 4 = %g\n", MEM[3]);
  fprintf(stdout, "MEM 5 = %g\n", MEM[4]);
  fprintf(stdout, "MEM 6 = %g\n", MEM[5]);
  fprintf(stdout, "MEM 7 = %g\n", MEM[6]);

//   CHECK = (THRESH >= 0.0f);
//
//   /*! Print headings: */
//   fprintf(stdout, "\n");
//   fprintf(stdout, "TIME TR      N  BWL BWU    NB  NRHS    P    Q L*U Time Slv Time   MFLOPS   MFLOP2  CHECK\n");
//   fprintf(stdout, "---- -- ------  --- ---  ---- ----- ---- ---- -------- -------- -------- -------- ------\n");
//   fprintf(stdout, "\n");
//   fflush(stdout);

  /*! Loop over different process grids: */
//   for (I = 1; I <= NGRIDS; I++) {
//
//     NPROW = PVAL[I - 1];
//     NPCOL = QVAL[I - 1];
//
//     fprintf(stdout, "Solving for a %d x %d grid!\n", NPROW, NPCOL);
//   }

  free(MEM);
  Cblacs_exit(0);
  exit(EXIT_SUCCESS);
}
And it now works...

Code:
[ejspeiro@node01 scalapack-ex07]$ make clean; make; make run np=1
rm -f *.o blogs
clear
gcc -I/opt/intel/impi/3.2.0.011/include64/ -c -DAdd_ -g -Wall -Werror blogs.c
gfortran -g -o blogs blogs.o /home/ejspeiro/libraries/scalapack-2.0.2/TESTING/LIN/pdgbinfo.o /home/ejspeiro/libraries/scalapack-2.0.2/libscalapack.a /home/ejspeiro/libraries/lapack-3.4.1/liblapack.a \
        /home/ejspeiro/libraries/BLAS/libblas.a -L/opt/intel/impi/3.2.0.011/lib64 -lmpi -lmpigf -lmpigi -lrt -lpthread -ldl
mpirun -r ssh -f mpd.hosts -np 1 `pwd`/blogs
SCALAPACK banded linear systems.
'MPI machine'                                                                  

Tests of the parallel real double precision band matrix solve
The following scaled residual checks will be computed:
 Solve residual         = ||Ax - b|| / (||x|| * ||A|| * eps * N)
 Factorization residual = ||A - LU|| / (||A|| * eps * N)
The matrix A is randomly generated for each test.

An explanation of the input/output parameters follows:
TIME    : Indicates whether WALL or CPU time was used.
N       : The number of rows and columns in the matrix A.
bwl, bwu      : The number of diagonals in the matrix A.
NB      : The size of the column panels the matrix A is split into. [-1 for default]
NRHS    : The total number of RHS to solve for.
NBRHS   : The number of RHS to be put on a column of processes before going
          on to the next column of processes.
P       : The number of process rows.
Q       : The number of process columns.
THRESH  : If a residual value is less than THRESH, CHECK is flagged as PASSED
Fact time: Time in seconds to factor the matrix
Sol Time: Time in seconds to solve the system.
MFLOPS  : Rate of execution for factor and solve using sequential operation count.
MFLOP2  : Rough estimate of speed using actual op count (accurate big P,N).

The following parameter values will be used:
  N    :            12
  bwl  :             4
  bwu  :             3
  NB   :            -1
  NRHS :             1
  NBRHS:             1
  P    :             1
  Q    :             1

Relative machine precision (eps) is taken to be       0.111022E-15
Routines pass computational tests if scaled residual is less than   3.0000    
MEM 1 = 8.48798e-314
MEM 2 = nan
MEM 3 = 2.122e-314
MEM 4 = 2.122e-314
MEM 5 = 0
MEM 6 = 0
MEM 7 = 0
[ejspeiro@node01 scalapack-ex07]$
 
Old 03-20-2013, 08:54 PM   #3
ejspeiro
Member
 
Registered: Feb 2011
Location: San Diego, California (92115), U.S.A.
Distribution: Ubuntu 14.04 LTS (Trusty Tahr)
Posts: 201

Original Poster
Rep: Reputation: 26
Update

Here's the code for the PDGBINFO Fortran subroutine:

Code:
      SUBROUTINE PDGBINFO( SUMMRY, NOUT, TRANS, NMAT, NVAL, LDNVAL, NBW,
     $                     BWLVAL, BWUVAL, LDBWVAL, NNB, NBVAL, LDNBVAL,
     $                     NNR, NRVAL, LDNRVAL, NNBR, NBRVAL, LDNBRVAL,
     $                     NGRIDS, PVAL, LDPVAL, QVAL, LDQVAL, THRESH,
     $                     WORK, IAM, NPROCS )
*
*
*
*  -- ScaLAPACK routine (version 1.7) --
*     University of Tennessee, Knoxville, Oak Ridge National Laboratory,
*     and University of California, Berkeley.
*     November 15, 1997
*
*     .. Scalar Arguments ..
      CHARACTER          TRANS
      CHARACTER*(*)      SUMMRY
      INTEGER            IAM,
     $                   LDBWVAL, LDNBRVAL, LDNBVAL, LDNRVAL, LDNVAL,
     $                   LDPVAL, LDQVAL, NGRIDS, NMAT, NNB, NNBR, NBW,
     $                   NPROCS, NNR, NOUT
      REAL               THRESH
*     ..
*     .. Array Arguments ..
      INTEGER            NBRVAL( LDNBRVAL ), NBVAL( LDNBVAL ),
     $                   NRVAL( LDNRVAL ), NVAL( LDNVAL ),
     $                   BWLVAL( LDBWVAL),BWUVAL( LDBWVAL),
     $                   PVAL( LDPVAL ), QVAL(LDQVAL), WORK( * )
*     ..
*
*  Purpose
*  =======
*
*  PDGBINFO get needed startup information for band factorization
*  and transmits it to all processes.
*
*  Arguments
*  =========
*
*  SUMMRY   (global output) CHARACTER*(*)
*           Name of output (summary) file (if any). Only defined for
*           process 0.
*
*  NOUT     (global output) INTEGER
*           The unit number for output file. NOUT = 6, ouput to screen,
*           NOUT = 0, output to stderr.  Only defined for process 0.
*
*
*  NMAT     (global output) INTEGER
*           The number of different values that can be used for N.
*
*  NVAL     (global output) INTEGER array, dimension (LDNVAL)
*           The values of N (number of columns in matrix) to run the
*           code with.
*
*  NBW      (global output) INTEGER
*           The number of different values that can be used for @bw@.
*  BWLVAL   (global output) INTEGER array, dimension (LDNVAL)
*           The values of BWL (number of subdiagonals in matrix) to run
*           the code with.
*  BWUVAL   (global output) INTEGER array, dimension (LDNVAL)
*           The values of BW (number of supdiagonals in matrix) to run
*           the code with.
*
*  LDNVAL   (global input) INTEGER
*           The maximum number of different values that can be used for
*           N, LDNVAL > =  NMAT.
*
*  NNB      (global output) INTEGER
*           The number of different values that can be used for NB.
*
*  NBVAL    (global output) INTEGER array, dimension (LDNBVAL)
*           The values of NB (blocksize) to run the code with.
*
*  LDNBVAL  (global input) INTEGER
*           The maximum number of different values that can be used for
*           NB, LDNBVAL >= NNB.
*
*  NNR      (global output) INTEGER
*           The number of different values that can be used for NRHS.
*
*  NRVAL    (global output) INTEGER array, dimension(LDNRVAL)
*           The values of NRHS (# of Right Hand Sides) to run the code
*           with.
*
*  LDNRVAL  (global input) INTEGER
*           The maximum number of different values that can be used for
*           NRHS, LDNRVAL >= NNR.
*
*  NNBR     (global output) INTEGER
*           The number of different values that can be used for NBRHS.
*
*  NBRVAL   (global output) INTEGER array, dimension (LDNBRVAL)
*           The values of NBRHS (RHS blocksize) to run the code with.
*
*  LDNBRVAL (global input) INTEGER
*           The maximum number of different values that can be used for
*           NBRHS, LDNBRVAL >= NBRVAL.
*
*  NGRIDS   (global output) INTEGER
*           The number of different values that can be used for P & Q.
*
*  PVAL     (global output) INTEGER array, dimension (LDPVAL)
*           Not used (will be returned as all 1s) since proc grid is 1D
*
*  LDPVAL   (global input) INTEGER
*           The maximum number of different values that can be used for
*           P, LDPVAL >= NGRIDS.
*
*  QVAL     (global output) INTEGER array, dimension (LDQVAL)
*           The values of Q (number of process columns) to run the code
*           with.
*
*  LDQVAL   (global input) INTEGER
*           The maximum number of different values that can be used for
*           Q, LDQVAL >= NGRIDS.
*
*  THRESH   (global output) REAL
*           Indicates what error checks shall be run and printed out:
*            = 0 : Perform no error checking
*            > 0 : report all residuals greater than THRESH, perform
*                  factor check only if solve check fails
*
*  WORK     (local workspace) INTEGER array of dimension >=
*           MAX( 8, LDNVAL+2*LDNBVAL+LDNRVAL+LDNBRVAL+LDPVAL+LDQVAL
*    $              +3*LDNVAL)
*           Used to pack input arrays in order to send info in one
*           message.
*
*  IAM      (local input) INTEGER
*           My process number.
*
*  NPROCS   (global input) INTEGER
*           The total number of processes.
*
* ======================================================================
*
* Note: For packing the information we assumed that the length in bytes
* ===== of an integer is equal to the length in bytes of a real single
*       precision.
*
*  =====================================================================
*
*  Code Developer: Andrew J. Cleary, University of Tennessee.
*    Current address: Lawrence Livermore National Labs.
*  This version released: August, 2001.
*
* ======================================================================
*
*     .. Parameters ..
      INTEGER            NIN
      PARAMETER          ( NIN = 11 )
*     ..
*     .. Local Scalars ..
      INTEGER            I, ICTXT
      CHARACTER*79       USRINFO
      DOUBLE PRECISION   EPS
*     ..
*     .. External Subroutines ..
      EXTERNAL           BLACS_ABORT, BLACS_GET, BLACS_GRIDEXIT,
     $                   BLACS_GRIDINIT, BLACS_SETUP, ICOPY, IGEBR2D,
     $                   IGEBS2D, SGEBR2D, SGEBS2D
*     ..
*     .. External Functions ..
      LOGICAL            LSAME
      DOUBLE PRECISION   PDLAMCH
      EXTERNAL           LSAME, PDLAMCH
*     ..
*     .. Intrinsic Functions ..
      INTRINSIC          MAX, MIN
*     ..
*     .. Executable Statements ..
*
*     Process 0 reads the input data, broadcasts to other processes and
*     writes needed information to NOUT
*
      IF( IAM.EQ.0 ) THEN
*
*        Open file and skip data file header
*
         OPEN( NIN, FILE = 'BLU.dat', STATUS = 'OLD' )
         READ( NIN, FMT = * ) SUMMRY
         SUMMRY = ' '
*
*        Read in user-supplied info about machine type, compiler, etc.
*
         READ( NIN, FMT = 9999 ) USRINFO
*
*        Read name and unit number for summary output file
*
         READ( NIN, FMT = * ) SUMMRY
         READ( NIN, FMT = * ) NOUT
         IF( NOUT.NE.0 .AND. NOUT.NE.6 )
     $      OPEN( NOUT, FILE = SUMMRY, STATUS = 'UNKNOWN' )
*
*        Read and check the parameter values for the tests.
*
*        Get TRANS
*
         READ( NIN, FMT = * ) TRANS
*
*
*        Get number of matrices and their dimensions
*
         READ( NIN, FMT = * ) NMAT
         IF( NMAT.LT.1 .OR. NMAT.GT.LDNVAL ) THEN
            WRITE( NOUT, FMT = 9994 ) 'N', LDNVAL
            GO TO 20
         END IF
         READ( NIN, FMT = * ) ( NVAL( I ), I = 1, NMAT )
*
*        Get bandwidths
*
         READ( NIN, FMT = * ) NBW
         IF( NBW.LT.1 .OR. NBW.GT.LDBWVAL ) THEN
            WRITE( NOUT, FMT = 9994 ) 'BW', LDBWVAL
            GO TO 20
         END IF
         READ( NIN, FMT = * ) ( BWLVAL( I ), I = 1, NBW )
         READ( NIN, FMT = * ) ( BWUVAL( I ), I = 1, NBW )
*
*        Get values of NB
*
         READ( NIN, FMT = * ) NNB
         IF( NNB.LT.1 .OR. NNB.GT.LDNBVAL ) THEN
            WRITE( NOUT, FMT = 9994 ) 'NB', LDNBVAL
            GO TO 20
         END IF
         READ( NIN, FMT = * ) ( NBVAL( I ), I = 1, NNB )
*
*        Get values of NRHS
*
         READ( NIN, FMT = * ) NNR
         IF( NNR.LT.1 .OR. NNR.GT.LDNRVAL ) THEN
            WRITE( NOUT, FMT = 9994 ) 'NRHS', LDNRVAL
            GO TO 20
         END IF
         READ( NIN, FMT = * ) ( NRVAL( I ), I = 1, NNR )
*
*        Get values of NBRHS
*
         READ( NIN, FMT = * ) NNBR
         IF( NNBR.LT.1 .OR. NNBR.GT.LDNBRVAL ) THEN
            WRITE( NOUT, FMT = 9994 ) 'NBRHS', LDNBRVAL
            GO TO 20
         END IF
         READ( NIN, FMT = * ) ( NBRVAL( I ), I = 1, NNBR )
*
*        Get number of grids
*
         READ( NIN, FMT = * ) NGRIDS
         IF( NGRIDS.LT.1 .OR. NGRIDS.GT.LDPVAL ) THEN
            WRITE( NOUT, FMT = 9994 ) 'Grids', LDPVAL
            GO TO 20
         ELSE IF( NGRIDS.GT.LDQVAL ) THEN
            WRITE( NOUT, FMT = 9994 ) 'Grids', LDQVAL
            GO TO 20
         END IF
*
*        Processor grid must be 1D so set PVAL to 1
         DO 8738 I = 1, NGRIDS
            PVAL( I ) = 1
 8738    CONTINUE
*
*        Get values of Q
*
         READ( NIN, FMT = * ) ( QVAL( I ), I = 1, NGRIDS )
*
*        Get level of checking
*
         READ( NIN, FMT = * ) THRESH
*
*        Close input file
*
         CLOSE( NIN )
*
*        For pvm only: if virtual machine not set up, allocate it and
*        spawn the correct number of processes.
*
         IF( NPROCS.LT.1 ) THEN
            NPROCS = 0
            DO 10 I = 1, NGRIDS
               NPROCS = MAX( NPROCS, PVAL( I )*QVAL( I ) )
   10       CONTINUE
            CALL BLACS_SETUP( IAM, NPROCS )
         END IF
*
*        Temporarily define blacs grid to include all processes so
*        information can be broadcast to all processes.
*
         CALL BLACS_GET( -1, 0, ICTXT )
         CALL BLACS_GRIDINIT( ICTXT, 'Row-major', 1, NPROCS )
*
*        Compute machine epsilon
*
         EPS = PDLAMCH( ICTXT, 'eps' )
*
*        Pack information arrays and broadcast
*
         CALL SGEBS2D( ICTXT, 'All', ' ', 1, 1, THRESH, 1 )
         I = 1
         WORK( I ) = NMAT
         I = I+1
         WORK( I ) = NBW
         I = I+1
         WORK( I ) = NNB
         I = I+1
         WORK( I ) = NNR
         I = I+1
         WORK( I ) = NNBR
         I = I+1
         WORK( I ) = NGRIDS
         I = I+1
         IF( LSAME( TRANS, 'N' ) ) THEN
            WORK( I ) = 1
         ELSE
            TRANS = 'T'
            WORK( I ) = 2
         END IF
         I = I+1
*        Send number of elements to be sent
         CALL IGEBS2D( ICTXT, 'All', ' ', 1, 1, I-1, 1 )
*        Send elements
         CALL IGEBS2D( ICTXT, 'All', ' ', I-1, 1, WORK, I-1 )
*
         I = 1
         CALL ICOPY( NMAT, NVAL, 1, WORK( I ), 1 )
         I = I + NMAT
         CALL ICOPY( NBW, BWLVAL, 1, WORK( I ), 1 )
         I = I + NBW
         CALL ICOPY( NBW, BWUVAL, 1, WORK( I ), 1 )
         I = I + NBW
         CALL ICOPY( NNB, NBVAL, 1, WORK( I ), 1 )
         I = I + NNB
         CALL ICOPY( NNR, NRVAL, 1, WORK( I ), 1 )
         I = I + NNR
         CALL ICOPY( NNBR, NBRVAL, 1, WORK( I ), 1 )
         I = I + NNBR
         CALL ICOPY( NGRIDS, PVAL, 1, WORK( I ), 1 )
         I = I + NGRIDS
         CALL ICOPY( NGRIDS, QVAL, 1, WORK( I ), 1 )
         I = I + NGRIDS
         CALL IGEBS2D( ICTXT, 'All', ' ', I-1, 1, WORK, I-1 )
*
*        regurgitate input
*
         WRITE( NOUT, FMT = 9999 )
     $                   'SCALAPACK banded linear systems.'
         WRITE( NOUT, FMT = 9999 ) USRINFO
         WRITE( NOUT, FMT = * )
         WRITE( NOUT, FMT = 9999 )
     $                   'Tests of the parallel '//
     $                   'real double precision band matrix solve '
         WRITE( NOUT, FMT = 9999 )
     $                   'The following scaled residual '//
     $                   'checks will be computed:'
         WRITE( NOUT, FMT = 9999 )
     $                   ' Solve residual         = ||Ax - b|| / '//
     $                   '(||x|| * ||A|| * eps * N)'
            WRITE( NOUT, FMT = 9999 )
     $                   ' Factorization residual = ||A - LU|| /'//
     $                   ' (||A|| * eps * N)'
         WRITE( NOUT, FMT = 9999 )
     $                   'The matrix A is randomly '//
     $                   'generated for each test.'
         WRITE( NOUT, FMT = * )
         WRITE( NOUT, FMT = 9999 )
     $                   'An explanation of the input/output '//
     $                   'parameters follows:'
         WRITE( NOUT, FMT = 9999 )
     $                   'TIME    : Indicates whether WALL or '//
     $                   'CPU time was used.'
*
         WRITE( NOUT, FMT = 9999 )
     $                   'N       : The number of rows and columns '//
     $                   'in the matrix A.'
         WRITE( NOUT, FMT = 9999 )
     $                   'bwl, bwu      : The number of diagonals '//
     $                   'in the matrix A.'
         WRITE( NOUT, FMT = 9999 )
     $                   'NB      : The size of the column panels the'//
     $                   ' matrix A is split into. [-1 for default]'
         WRITE( NOUT, FMT = 9999 )
     $                   'NRHS    : The total number of RHS to solve'//
     $                   ' for.'
         WRITE( NOUT, FMT = 9999 )
     $                   'NBRHS   : The number of RHS to be put on '//
     $                   'a column of processes before going'
         WRITE( NOUT, FMT = 9999 )
     $                   '          on to the next column of processes.'
         WRITE( NOUT, FMT = 9999 )
     $                   'P       : The number of process rows.'
         WRITE( NOUT, FMT = 9999 )
     $                   'Q       : The number of process columns.'
         WRITE( NOUT, FMT = 9999 )
     $                   'THRESH  : If a residual value is less than'//
     $                   ' THRESH, CHECK is flagged as PASSED'
         WRITE( NOUT, FMT = 9999 )
     $                   'Fact time: Time in seconds to factor the'//
     $                   ' matrix'
         WRITE( NOUT, FMT = 9999 )
     $                   'Sol Time: Time in seconds to solve the'//
     $                   ' system.'
         WRITE( NOUT, FMT = 9999 )
     $                   'MFLOPS  : Rate of execution for factor '//
     $                   'and solve using sequential operation count.'
         WRITE( NOUT, FMT = 9999 )
     $                   'MFLOP2  : Rough estimate of speed '//
     $                   'using actual op count (accurate big P,N).'
         WRITE( NOUT, FMT = * )
         WRITE( NOUT, FMT = 9999 )
     $                   'The following parameter values will be used:'
         WRITE( NOUT, FMT = 9996 )
     $                   'N    ', ( NVAL(I), I = 1, MIN(NMAT, 10) )
         IF( NMAT.GT.10 )
     $      WRITE( NOUT, FMT = 9997 ) ( NVAL(I), I = 11, NMAT )
         WRITE( NOUT, FMT = 9996 )
     $                   'bwl  ', ( BWLVAL(I), I = 1, MIN(NBW, 10) )
         IF( NBW.GT.10 )
     $      WRITE( NOUT, FMT = 9997 ) ( BWLVAL(I), I = 11, NBW )
         WRITE( NOUT, FMT = 9996 )
     $                   'bwu  ', ( BWUVAL(I), I = 1, MIN(NBW, 10) )
         IF( NBW.GT.10 )
     $      WRITE( NOUT, FMT = 9997 ) ( BWUVAL(I), I = 11, NBW )
         WRITE( NOUT, FMT = 9996 )
     $                   'NB   ', ( NBVAL(I), I = 1, MIN(NNB, 10) )
         IF( NNB.GT.10 )
     $      WRITE( NOUT, FMT = 9997 ) ( NBVAL(I), I = 11, NNB )
         WRITE( NOUT, FMT = 9996 )
     $                   'NRHS ', ( NRVAL(I), I = 1, MIN(NNR, 10) )
         IF( NNR.GT.10 )
     $      WRITE( NOUT, FMT = 9997 ) ( NRVAL(I), I = 11, NNR )
         WRITE( NOUT, FMT = 9996 )
     $                   'NBRHS', ( NBRVAL(I), I = 1, MIN(NNBR, 10) )
         IF( NNBR.GT.10 )
     $      WRITE( NOUT, FMT = 9997 ) ( NBRVAL(I), I = 11, NNBR )
         WRITE( NOUT, FMT = 9996 )
     $                   'P    ', ( PVAL(I), I = 1, MIN(NGRIDS, 10) )
         IF( NGRIDS.GT.10 )
     $      WRITE( NOUT, FMT = 9997) ( PVAL(I), I = 11, NGRIDS )
         WRITE( NOUT, FMT = 9996 )
     $                   'Q    ', ( QVAL(I), I = 1, MIN(NGRIDS, 10) )
         IF( NGRIDS.GT.10 )
     $      WRITE( NOUT, FMT = 9997 ) ( QVAL(I), I = 11, NGRIDS )
         WRITE( NOUT, FMT = * )
         WRITE( NOUT, FMT = 9995 ) EPS
         WRITE( NOUT, FMT = 9998 ) THRESH
         CALL FLUSH(6)
*
      ELSE
*
*        If in pvm, must participate setting up virtual machine
*
         IF( NPROCS.LT.1 )
     $      CALL BLACS_SETUP( IAM, NPROCS )
*
*        Temporarily define blacs grid to include all processes so
*        all processes have needed startup information
*
         CALL BLACS_GET( -1, 0, ICTXT )
         CALL BLACS_GRIDINIT( ICTXT, 'Row-major', 1, NPROCS )
*
*        Compute machine epsilon
*
         EPS = PDLAMCH( ICTXT, 'eps' )
*
         CALL SGEBR2D( ICTXT, 'All', ' ', 1, 1, THRESH, 1, 0, 0 )
         CALL IGEBR2D( ICTXT, 'All', ' ', 1, 1, I, 1, 0, 0 )
         CALL IGEBR2D( ICTXT, 'All', ' ', I, 1, WORK, I, 0, 0 )
         I = 1
         NMAT = WORK( I )
         I = I+1
         NBW = WORK( I )
         I = I+1
         NNB = WORK( I )
         I = I+1
         NNR = WORK( I )
         I = I+1
         NNBR = WORK( I )
         I = I+1
         NGRIDS = WORK( I )
         I = I+1
         IF( WORK( I ) .EQ. 1 ) THEN
            TRANS = 'N'
         ELSE
            TRANS = 'T'
         END IF
         I = I+1
*
         I = NMAT + NBW + NNB + NNR + NNBR + 2*NGRIDS
         I = I + NBW
*
         CALL IGEBR2D( ICTXT, 'All', ' ', 1, I, WORK, 1, 0, 0 )
         I = 1
         CALL ICOPY( NMAT, WORK( I ), 1, NVAL, 1 )
         I = I + NMAT
         CALL ICOPY( NBW, WORK( I ), 1, BWLVAL, 1 )
         I = I + NBW
         CALL ICOPY( NBW, WORK( I ), 1, BWUVAL, 1 )
         I = I + NBW
         CALL ICOPY( NNB, WORK( I ), 1, NBVAL, 1 )
         I = I + NNB
         CALL ICOPY( NNR, WORK( I ), 1, NRVAL, 1 )
         I = I + NNR
         CALL ICOPY( NNBR, WORK( I ), 1, NBRVAL, 1 )
         I = I + NNBR
         CALL ICOPY( NGRIDS, WORK( I ), 1, PVAL, 1 )
         I = I + NGRIDS
         CALL ICOPY( NGRIDS, WORK( I ), 1, QVAL, 1 )
*
      END IF
*
      CALL BLACS_GRIDEXIT( ICTXT )
*
      RETURN
*
   20 WRITE( NOUT, FMT = 9993 )
      CLOSE( NIN )
      IF( NOUT.NE.6 .AND. NOUT.NE.0 )
     $   CLOSE( NOUT )
*
      CALL BLACS_ABORT( ICTXT, 1 )
      STOP
*
 9999 FORMAT( A )
 9998 FORMAT( 'Routines pass computational tests if scaled residual ',
     $        'is less than ', G12.5 )
 9997 FORMAT( '                ', 10I6 )
 9996 FORMAT( 2X, A5, ':        ', 10I6 )
 9995 FORMAT( 'Relative machine precision (eps) is taken to be ',
     $        E18.6 )
 9994 FORMAT( ' Number of values of ',5A, ' is less than 1 or greater ',
     $        'than ', I2 )
 9993 FORMAT( ' Illegal input in file ',40A,'.  Aborting run.' )
*
*     End of PDGBINFO
*
      END
Using GDB, I have traced the error to line 181:

Code:
         READ( NIN, FMT = * ) SUMMRY
SUMMRY is declared as (See LINE 35):

Code:
*  SUMMRY   (global output) CHARACTER*(*)
*           Name of output (summary) file (if any). Only defined for
*           process 0.
The PDGBDRIVER (sample code which uses PDGBINFO) passes a:

Code:
      CHARACTER*80       OUTFILE
Which I try to emulate in C, as follows:

Code:
  char      *OUTFILE;  /* ? */
...
  OUTFILE = (char *) malloc(sizeof(char)*80);
  if (OUTFILE == NULL) {
    fprintf(stderr, "Not enough memory for 80.\n");
    MPI_Abort(MPI_COMM_WORLD, MPI_ERROR_CODE_NOT_MEMRY);
  }
Is that correct?!? Is CHARACTER*80 a string with 80 characters? Or does it mean something else?

Thanks!

Last edited by ejspeiro; 03-20-2013 at 08:55 PM. Reason: Adding title
 
Old 03-20-2013, 11:59 PM   #4
ejspeiro
Member
 
Registered: Feb 2011
Location: San Diego, California (92115), U.S.A.
Distribution: Ubuntu 14.04 LTS (Trusty Tahr)
Posts: 201

Original Poster
Rep: Reputation: 26
Update

I tried this:

Code:
  OUTFILE = (unsigned char *) malloc(sizeof(unsigned char)*79);
  if (OUTFILE == NULL) {
    fprintf(stderr, "Not enough memory for 80.\n");
    MPI_Abort(MPI_COMM_WORLD, MPI_ERROR_CODE_NOT_MEMRY);
  }
And the code yields NO OUTPUT AT ALL!:

Code:
ejspeiro@node01 scalapack-ex07]$ make run np=1
mpirun -r ssh -f mpd.hosts -np 1 `pwd`/blogs
[ejspeiro@node01 scalapack-ex07]$
If I change the 79 to an 80, I get the seg fault!

 
  


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