Parallel matrix multiplication

abdobl · 09-21-2004, 02:09 AM

Hi every body..

I need a parallel matrix multiplication code in C language,I need it too much,I have searched the google site but it did not work.any help will be appresiated.
abdobl

rjlee · 09-21-2004, 03:56 AM

Modified C++ code from http://www.devarticles.com/c/a/Cplus...g-in-C-plus/4/

I haven't tested this, but it looks like it should work to me.

Calculates l * m, stores result in dest. m_numRows = number of rows in m and number of columns in l. numRows is number of rows in dest, numCols is number of cols in dest. Dimensions are assumed to be correct.

Code:

void matrixmul(double ** dest, double ** l, double ** m, int m_numRows, int numRows, int numCols) {
int r,c,i;
for (r=0;r<numRows;r++) {
for (c=0;c<m_numCols;c++) {
for (i=0;i<numCols;i++) {
dest[r][c]+=l[r][i]*m[i][c];
}
}
}
}

clockworks · 09-21-2004, 01:25 PM

he's looking for a parallel matrix multiply algorithm.

i got two questions for you...are you using shared memory or message passing? and is this a homework assignment? =P

-- C

abdobl · 09-22-2004, 06:11 AM

you are right ,I am looking for parallel matrix multiply algorithm,
I am using sockets with TCP/IP,stream sockets.
this is not a homework,it's step in project Iam working on...