2 * Program to test that the "no overtaking messages" semantics
3 * of point to point communications in MPI is satisfied.
4 * A long message is sent using MPI_BSend and received using MPI_Recv,
5 * followed by lots of short messages sent the same way.
9 * patrick@CS.MsState.Edu
13 /* Needed for malloc declaration */
23 /* Which tests to perform (not yet implemented) */
24 /* static int Do_Buffer = 1; */
25 /* static int Do_Standard = 1; */
27 /* Prototypes for picky compilers */
28 void Generate_Data ( double *, int );
29 void Normal_Test_Recv ( double *, int );
30 void Buffered_Test_Send ( double *, int );
31 void Buffered_Test_Ibsend ( double *, int );
32 int Check_Data ( double *, int );
33 void Clear_Buffer ( double *, int );
35 void Generate_Data(buffer, buff_size)
41 for (i = 0; i < buff_size; i++)
42 buffer[i] = (double)i+1;
45 void Normal_Test_Recv(buffer, buff_size)
54 for (j = 0; j < 2; j++) {
55 /* Receive a long message */
56 MPI_Recv(b, (buff_size/2 - 10), MPI_DOUBLE, src,
57 2000, MPI_COMM_WORLD, &Stat);
58 b += buff_size/2 - 10;
59 /* Followed by 10 short ones */
60 for (i = 0; i < 10; i++) {
61 MPI_Recv(b++, 1, MPI_DOUBLE, src, 2000, MPI_COMM_WORLD, &Stat);
66 void Buffered_Test_Send(buffer, buff_size)
74 for (j = 0; j < 2; j++) {
75 /* send a long message */
76 MPI_Bsend(buffer, (buff_size/2 - 10), MPI_DOUBLE, dest, 2000,
78 buffer += buff_size/2 - 10;
79 /* Followed by 10 short ones */
80 for (i = 0; i < 10; i++)
81 MPI_Bsend(buffer++, 1, MPI_DOUBLE,
82 dest, 2000, MPI_COMM_WORLD);
83 /* Force this set of Bsends to complete */
84 MPI_Buffer_detach( &bbuffer, &size );
85 MPI_Buffer_attach( bbuffer, size );
89 void Buffered_Test_Ibsend(buffer, buff_size)
98 MPI_Status statuses[20];
100 for (j = 0; j < 2; j++) {
101 /* send a long message */
103 MPI_Ibsend(buffer, (buff_size/2 - 10), MPI_DOUBLE, dest, 2000,
104 MPI_COMM_WORLD, &req[cnt++]);
105 buffer += buff_size/2 - 10;
106 /* Followed by 10 short ones */
107 for (i = 0; i < 10; i++)
108 MPI_Ibsend(buffer++, 1, MPI_DOUBLE,
109 dest, 2000, MPI_COMM_WORLD, &req[cnt++]);
110 /* Wait for these to finish (should finish immediately) */
111 MPI_Waitall( cnt, req, statuses );
113 /* Force this set of Bsends to complete; this may take longer than
115 MPI_Buffer_detach( &bbuffer, &size );
116 MPI_Buffer_attach( bbuffer, size );
120 int Check_Data(buffer, buff_size)
127 for (i = 0; i < buff_size; i++)
128 if (buffer[i] != (i + 1)) {
130 fprintf( stderr, "Value at %d is %f, should be %f\n", i,
131 buffer[i], (double)(i+1) );
132 if (err > 10) return 1;
137 void Clear_Buffer(buffer, buff_size)
142 for (i = 0; i < buff_size; i++)
147 int main(int argc, char **argv)
149 int rank; /* My Rank (0 or 1) */
150 double buffer[SIZE], *tmpbuffer, *tmpbuf;
152 char *Current_Test = NULL;
154 MPI_Init(&argc, &argv);
155 MPI_Comm_rank(MPI_COMM_WORLD, &rank);
158 Generate_Data(buffer, SIZE);
159 MPI_Pack_size( SIZE, MPI_DOUBLE, MPI_COMM_WORLD, &bsize );
160 tmpbuffer = (double *) malloc( bsize + 22*MPI_BSEND_OVERHEAD );
162 fprintf( stderr, "Could not allocate bsend buffer of size %d\n",
164 MPI_Abort( MPI_COMM_WORLD, 1 );
166 MPI_Buffer_attach( tmpbuffer, bsize + 22*MPI_BSEND_OVERHEAD );
167 Buffered_Test_Send(buffer, SIZE);
168 Buffered_Test_Ibsend(buffer, SIZE);
169 MPI_Buffer_detach( &tmpbuf, &tsize );
173 } else if (rank == dest) {
174 Test_Init("bsendtest", rank);
176 Current_Test = (char*)"Overtaking Test (Buffered Send -> Normal Receive)";
177 Clear_Buffer(buffer, SIZE);
179 Normal_Test_Recv(buffer, SIZE);
180 if (Check_Data(buffer, SIZE))
181 Test_Failed(Current_Test);
183 Test_Passed(Current_Test);
186 Current_Test = (char*)"Overtaking Test (Buffered Isend -> Normal Receive)";
187 Clear_Buffer(buffer, SIZE);
188 Normal_Test_Recv(buffer, SIZE);
189 if (Check_Data(buffer, SIZE))
190 Test_Failed(Current_Test);
192 Test_Passed(Current_Test);
196 int rval = Summarize_Test_Results(); /* Returns number of tests;
203 fprintf(stderr, "*** This program uses exactly 2 processes! ***\n");
204 MPI_Abort( MPI_COMM_WORLD, 1 );