Update MPI Programming and Benchmarking

Week 10: OpenMP / MPI Programming and Benchmarking

@@ -327,10 +327,16 @@ int main(int argc, char** argv) {
         // Gather encrypted data from all processes
         MPI_Gather(local_encrypted, chunk_size, MPI_BYTE, encrypted, chunk_size, MPI_BYTE, 0, MPI_COMM_WORLD);
 
+        // Scatter encrypted data to all processes for decryption
+        MPI_Scatter(encrypted, chunk_size, MPI_BYTE, local_encrypted, chunk_size, MPI_BYTE, 0, MPI_COMM_WORLD);
+
         start = MPI_Wtime();
-        blowfish_decrypt(&key, encrypted, DATA_SIZE, decrypted);
+        blowfish_decrypt(&key, local_encrypted, chunk_size, local_decrypted);
         end = MPI_Wtime();
-        printf("Decryption time (parallel): %f seconds\n", end - start);
+        printf("Process %d decryption time: %f seconds\n", rank, end - start);
+
+        // Gather decrypted data from all processes
+        MPI_Gather(local_decrypted, chunk_size, MPI_BYTE, decrypted, chunk_size, MPI_BYTE, 0, MPI_COMM_WORLD);
 
         // Validate the decrypted data
         if (memcmp(data, decrypted, DATA_SIZE) != 0) {
@@ -353,8 +359,19 @@ int main(int argc, char** argv) {
         end = MPI_Wtime();
         printf("Process %d encryption time: %f seconds\n", rank, end - start);
 
-        // Send encrypted data chunk to root process
+        // Gather encrypted data chunk to root process
         MPI_Gather(local_encrypted, chunk_size, MPI_BYTE, NULL, chunk_size, MPI_BYTE, 0, MPI_COMM_WORLD);
+
+        // Scatter encrypted data to all processes for decryption
+        MPI_Scatter(NULL, chunk_size, MPI_BYTE, local_encrypted, chunk_size, MPI_BYTE, 0, MPI_COMM_WORLD);
+
+        start = MPI_Wtime();
+        blowfish_decrypt(&key, local_encrypted, chunk_size, local_decrypted);
+        end = MPI_Wtime();
+        printf("Process %d decryption time: %f seconds\n", rank, end - start);
+
+        // Gather decrypted data chunk to root process
+        MPI_Gather(local_decrypted, chunk_size, MPI_BYTE, NULL, chunk_size, MPI_BYTE, 0, MPI_COMM_WORLD);
     }
 
     free(local_data);
@@ -369,6 +386,7 @@ int main(int argc, char** argv) {
 
 
 
+
 mpicc blowfish_mpi.c -o blowfish_mpi -lcrypto
 mpirun -np 4 ./blowfish_mpi
 
@@ -403,55 +421,73 @@ Decrypted data matches original data!
 -N 2
 -p 128GB
 
-Process 1 encryption time: 0.476727 seconds
-Process 0 encryption time: 0.476585 seconds
-Decryption time (parallel): 0.954134 seconds
+Process 1 encryption time: 0.476605 seconds
+Process 0 encryption time: 0.476566 seconds
+Process 1 decryption time: 0.476421 seconds
+Process 0 decryption time: 0.476719 seconds
 Decrypted data matches original data!
 
 
+
 -N 3
 -p 128GB
 
-Process 1 encryption time: 0.326551 seconds
-Process 2 encryption time: 0.323678 seconds
-Process 0 encryption time: 0.323797 seconds
-Decryption time (parallel): 0.970143 seconds
+Process 1 encryption time: 0.321120 seconds
+Process 2 encryption time: 0.322333 seconds
+Process 0 encryption time: 0.318449 seconds
+Process 2 decryption time: 0.317735 seconds
+Process 1 decryption time: 0.321197 seconds
+Process 0 decryption time: 0.318884 seconds
+
 
 
 
 -N 4
 -p 128GB 
 
-Process 1 encryption time: 0.243206 seconds
-Process 3 encryption time: 0.243105 seconds
-Process 0 encryption time: 0.240108 seconds
-Process 2 encryption time: 0.240205 seconds
-Decryption time (parallel): 0.961980 seconds
-Decrypted data matches original data!
+Process 3 encryption time: 0.238996 seconds
+Process 1 encryption time: 0.241968 seconds
+Process 0 encryption time: 0.242709 seconds
+Process 2 encryption time: 0.242700 seconds
+Process 3 decryption time: 0.240068 seconds
+Process 1 decryption time: 0.240390 seconds
+Process 0 decryption time: 0.241649 seconds
+Process 2 decryption time: 0.241826 seconds
+
 
 
 -N 5
 -p 128GB
 
-Process 3 encryption time: 0.193014 seconds	
-Process 4 encryption time: 0.207064 seconds
-Process 0 encryption time: 0.196599 seconds
-Process 2 encryption time: 0.196809 seconds
-Process 1 encryption time: 0.205737 seconds
-Decryption time (parallel): 0.983177 seconds
+Process 0 encryption time: 0.192699 seconds
+Process 1 encryption time: 0.195781 seconds
+Process 2 encryption time: 0.196270 seconds
+Process 3 encryption time: 0.195687 seconds
+Process 4 encryption time: 0.192910 seconds
+Process 4 decryption time: 0.195979 seconds
+Process 1 decryption time: 0.196943 seconds
+Process 3 decryption time: 0.196658 seconds
+Process 0 decryption time: 0.196703 seconds
+Process 2 decryption time: 0.196011 seconds
 Decrypted data matches original data!
 
 
+
 -N 6
 -p 128GB
 
-Process 5 encryption time: 0.164433 seconds
-Process 4 encryption time: 0.163639 seconds
-Process 1 encryption time: 0.161994 seconds
-Process 3 encryption time: 0.163783 seconds
-Process 2 encryption time: 0.162038 seconds
-Process 0 encryption time: 0.163603 seconds
-Decryption time (parallel): 1.002695 seconds
+Process 5 encryption time: 0.162260 seconds
+Process 4 encryption time: 0.165288 seconds
+Process 1 encryption time: 0.164572 seconds
+Process 3 encryption time: 0.164788 seconds
+Process 2 encryption time: 0.162729 seconds
+Process 0 encryption time: 0.164458 seconds
+Process 5 decryption time: 0.164114 seconds
+Process 4 decryption time: 0.163690 seconds
+Process 1 decryption time: 0.163860 seconds
+Process 3 decryption time: 0.164126 seconds
+Process 0 decryption time: 0.163264 seconds
+Process 2 decryption time: 0.163493 seconds