program freezing

From: Eric Frederich (eric.frederich_at_gmail_dot_com)
Date: Wed Dec 07 2005 - 14:47:52 PST

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    I'd like to share something that has been troubling me.
    Attached I have two files.  One is the program, the other is the input to
    the program.
    I compiled the program with
    ./upcc -pthreads -o matrixSolver -T=2 matrixSolver.upc
    and run the program like
    ./upcrun -n 2 -c 2 -p 2 matrixSolver
    As the program is attached it freezes on me at the following point in the
    if (ABS(a[j][i]) > ABS(a[maxrow][i]))
    I take the two operands of this inequality and store them in local variables
    tmpa and tmpb.
    If you use these variables for the inequality (like if(tmpa > tmpb) ) the
    program runs fine and solves the matrix.
    This confuses me greatly since the macro ABS still works since I am using it
    when storing the variables in tmpa and tmpb.
    the ABS macro is defined as follows...
    #define ABS(x) (x < 0 ? -(x) : (x))
    Any ideas anyone?
    Also, I hope that I am accomplishing what I wanted to do.  I want to
    distribute the rows of the matrix in a round robin fashion.
    I haven't got to dynamic memory allocation with UPC yet so I defined the
    array as follows.
    shared[1001] double a[1000][1001];
    By doing this is affinity of a[0][0] through a[0][1001] going to the first
    and the affinity of a[1][0] through a[1][1001] going to the next thread,
    and the affinity of a[2][0] through a[2][1001] to the next, and so on?
    This is a square matrix with an extra column to store the one dimensional
    Thanks ahead of time,
    Eric L. Frederich

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