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POMPI Barrier and Printing
 

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    <p>I am working on a simple MPI assignment that does row wise Matrix Multiplication.</p> <p>I am trying to output the matrix and for some reason the order of the prints is out of order. Only one process is designated to print at a time, the output if flushed, and a MPI_Barrier is used. So I am confused how the prints are being reordered.</p> <pre><code>void print_matrix(int id, int p, int pn, int n, double **row, double *shared_col_data, double *resdata){ int i,j, k; for(i=0; i&lt;p; i++){ for(k=0; k &lt; pn; k++){ int row_pos=((i*pn)+k); if(id==i){ if( row_pos &lt;n){ printf("[ROW: %10d][ID: %3d]\t",row_pos,id); printf("|"); for(j=0; j&lt;n; j++){ printf("%.4f ",row[k][j]); } if(row_pos == (n/2)){ printf("| X |"); } else{ printf("| |"); } printf("%.4f ",shared_col_data[row_pos]); fflush(stdout); } }//End its ur turn to print MPI_Barrier (MPI_COMM_WORLD); if(id==0){ if(row_pos == (n/2)){ printf("| = |"); } else{ printf("| |"); } printf("%.4f|\n",resdata[row_pos]); fflush(stdout); } MPI_Barrier (MPI_COMM_WORLD); } }//End Processor Loop } </code></pre> <p>Here is a sample output:</p> <pre><code>Input Size(N): 12 Processors(P): 12 N per Processors(P): 1 ID: 3 SN: 3 EN: 3 ID: 0 SN: 0 EN: 0 ID: 2 SN: 2 EN: 2 ID: 4 SN: 4 EN: 4 ID: 11 SN: 11 EN: 11 ID: 7 SN: 7 EN: 7 ID: 8 SN: 8 EN: 8 ID: 6 SN: 6 EN: 6 ID: 10 SN: 10 EN: 10 ID: 1 SN: 1 EN: 1 ID: 9 SN: 9 EN: 9 ID: 5 SN: 5 EN: 5 All Data Generated Column Data Shared Multiplication Done All res Gather [ROW: 0][ID: 0] |0.5974 0.7066 0.9131 0.1548 0.4382 0.5132 0.3729 0.5554 0.7832 0.7953 0.5202 0.6986 | |0.8076 | |2.4959| [ROW: 1][ID: 1] |0.4320 0.9492 0.2266 0.1211 0.3904 0.9614 0.2000 0.7380 0.4471 0.3622 0.9844 0.1921 | |0.0051 | |2.3152| [ROW: 2][ID: 2] |0.2821 0.6740 0.9673 0.6623 0.6922 0.9760 0.8697 0.0096 0.6827 0.9590 0.2399 0.1100 | |0.2254 | |2.8286| [ROW: 3][ID: 3] |0.5915 0.1042 0.7262 0.8395 0.9665 0.9716 0.2252 0.7184 0.6054 0.8336 0.5033 0.2620 | |0.3670 | |2.8024| | |2.1632| [ROW: 4][ID: 4] |0.0821 0.3956 0.0252 0.9953 0.3822 0.4278 0.8978 0.7726 0.5235 0.2972 0.3229 0.4520 | |0.1409 [ROW: 5][ID: 5] |0.5684 0.0840 0.5961 0.7087 0.1331 0.1426 0.1554 0.3976 0.2051 0.1481 0.9468 0.7025 | |0.5302 | |2.1380| | = |2.7801| [ROW: 6][ID: 6] |0.7347 0.9194 0.3374 0.9823 0.1040 0.3878 0.7086 0.3132 0.4359 0.8223 0.2545 0.8752 | X |0.9129 [ROW: 7][ID: 7] |0.0464 0.6857 0.7146 0.6858 0.3210 0.2477 0.5767 0.2342 0.1406 0.5467 0.4063 0.0733 | |0.1262 | |1.8125| [ROW: 8][ID: 8] |0.6413 0.1076 0.2843 0.3515 0.9252 0.0349 0.0830 0.5063 0.9232 0.9900 0.5849 0.5612 | |0.0204 | |2.1263| [ROW: 9][ID: 9] |0.5292 0.3410 0.8543 0.5942 0.5822 0.3245 0.1719 0.9346 0.7611 0.3722 0.9653 0.4368 | |0.5167 | |2.4469| | |2.6545| [ROW: 10][ID: 10] |0.7641 0.6008 0.9687 0.9276 0.2462 0.2832 0.0131 0.0390 0.4860 0.6569 0.9390 0.7620 | |0.7972 | |2.0755| [ROW: 11][ID: 11] |0.7291 0.5953 0.6171 0.0396 0.5790 0.5262 0.5881 0.2631 0.9517 0.5118 0.0835 0.2115 | |0.2310 </code></pre> <p>You can see some of the lines begin with the ends of the other lines, but the code that prints those is surround by a barrier.</p> <p>I feel like it is a simple issue and I am to tired to see it</p> <p>Thanks for any help.</p>
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    1. USSteven Feldman
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    1. COYou are right, I did search but didn't find that one. Thanks for your help.
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      1. USSteven Feldman
 

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