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/*
* Copyright (C) by Argonne National Laboratory
* See COPYRIGHT in top-level directory
*/
#include "mpi.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "mpitest.h"
#define IF_VERBOSE(cond, a) if (verbose && (cond)) { printf a ; fflush(stdout); }
#define SERVER_GID 0
#define CLIENT_GID 1
#define TIMEOUT "5"
/* This test checks whether a MPI_COMM_CONNECT can eventually time out and return
* an error of class MPI_ERR_PORT when the named port exists but no pending
* MPI_COMM_ACCEPT on server side. We divide all processes into a server group
* and a client group, the client group issues connect to the server group.
*
* Two test cases are performed in separately:
* (1) No_accept: Server only calls open/close_port while client tries to connect.
* Each connect call should return MPI_ERR_PORT.
* (2) Mismatched: Server only issues one accept while client tries twice connect.
* At least one of the connect call should return MPI_ERR_PORT. */
int rank, nproc;
int verbose = 0;
int test_mismatched_accept(MPI_Comm intra_comm, int gid);
int test_no_accept(MPI_Comm intra_comm, int gid);
#if defined(TEST_MISMATCH)
#define RUN_TEST(comm, gid) test_mismatched_accept(comm, gid)
#else /* no accept by default */
#define RUN_TEST(comm, gid) test_no_accept(comm, gid)
#endif
/* Check whether error clase is equal to the expected one. */
static inline int check_errno(int mpi_errno, int expected_errno)
{
int errclass = MPI_SUCCESS;
int err = 0;
MPI_Error_class(mpi_errno, &errclass);
if (errclass != expected_errno) {
char errstring[MPI_MAX_ERROR_STRING];
char exp_errstring[MPI_MAX_ERROR_STRING];
int errstrlen = 0;
err++;
MPI_Error_string(mpi_errno, errstring, &errstrlen);
MPI_Error_string(expected_errno, exp_errstring, &errstrlen);
fprintf(stderr, "Error: returned wrong error class %s, expected %s\n",
errstring, exp_errstring);
}
return err;
}
/* The first process in server group opens port and broadcast to all other
* processes in the world. */
static inline void open_and_bcast_port(int intra_rank, int gid, char (*port)[])
{
int server_rank = 0, local_server_rank = 0;
/* server root opens port */
if (intra_rank == 0 && gid == SERVER_GID) {
local_server_rank = rank;
MPI_Open_port(MPI_INFO_NULL, (*port));
IF_VERBOSE(1, ("server root: opened port1: <%s>\n", (*port)));
}
/* broadcast world rank of server root, then broadcast port */
MPI_Allreduce(&local_server_rank, &server_rank, 1, MPI_INT, MPI_SUM, MPI_COMM_WORLD);
MPI_Bcast((*port), MPI_MAX_PORT_NAME, MPI_CHAR, server_rank, MPI_COMM_WORLD);
}
int test_mismatched_accept(MPI_Comm intra_comm, int gid)
{
char port[MPI_MAX_PORT_NAME];
MPI_Comm comm = MPI_COMM_NULL;
int mpi_errno = MPI_SUCCESS;
int errs = 0;
int intra_rank, intra_nproc;
MTEST_VG_MEM_INIT(port, MPI_MAX_PORT_NAME * sizeof(char));
MPI_Comm_rank(intra_comm, &intra_rank);
MPI_Comm_size(intra_comm, &intra_nproc);
IF_VERBOSE(intra_rank == 0, ("%s: TEST mismatched accept case, %d nprocs in group\n",
(gid == SERVER_GID) ? "server" : "client", intra_nproc));
open_and_bcast_port(intra_rank, gid, &port);
/* client group */
if (gid == CLIENT_GID) {
int mpi_errno1 = MPI_SUCCESS, mpi_errno2 = MPI_SUCCESS;
IF_VERBOSE(intra_rank == 0, ("client: connecting to <%s> with default timeout.\n", port));
mpi_errno1 = MPI_Comm_connect(port, MPI_INFO_NULL, 0, intra_comm, &comm);
if (mpi_errno1 == MPI_SUCCESS) {
IF_VERBOSE(intra_rank == 0, ("connection matched, freeing communicator.\n"));
MPI_Comm_free(&comm);
}
if (mpi_errno1 != MPI_SUCCESS) {
errs += check_errno(mpi_errno1, MPI_ERR_PORT);
}
/* At least one of the connect calls should return MPI_ERR_PORT */
IF_VERBOSE(intra_rank == 0, ("client: connecting to <%s> again.\n", port));
mpi_errno2 = MPI_Comm_connect(port, MPI_INFO_NULL, 0, intra_comm, &comm);
if (mpi_errno2 == MPI_SUCCESS) {
IF_VERBOSE(intra_rank == 0, ("connection matched, freeing communicator.\n"));
MPI_Comm_free(&comm);
}
if (mpi_errno1 == MPI_SUCCESS) {
errs += check_errno(mpi_errno2, MPI_ERR_PORT);
} else {
errs += check_errno(mpi_errno2, MPI_SUCCESS);
}
} else if (gid == SERVER_GID) {
/* NOTE: if accept hangs, try increase MPIR_CVAR_CH3_COMM_CONN_TIMEOUT. */
IF_VERBOSE(intra_rank == 0, ("server: accepting connection to <%s>.\n", port));
mpi_errno = MPI_Comm_accept(port, MPI_INFO_NULL, 0, intra_comm, &comm);
if (mpi_errno == MPI_SUCCESS) {
IF_VERBOSE(intra_rank == 0, ("connection matched, freeing communicator.\n"));
MPI_Comm_free(&comm);
}
}
if (intra_rank == 0 && gid == SERVER_GID) {
IF_VERBOSE(1, ("server root: closing port.\n"));
MPI_Close_port(port);
}
return errs;
}
int test_no_accept(MPI_Comm intra_comm, int gid)
{
char port[MPI_MAX_PORT_NAME];
MPI_Info info = MPI_INFO_NULL;
MPI_Comm comm = MPI_COMM_NULL;
int mpi_errno = MPI_SUCCESS;
int errs = 0;
int intra_rank, intra_nproc;
MTEST_VG_MEM_INIT(port, MPI_MAX_PORT_NAME * sizeof(char));
MPI_Comm_rank(intra_comm, &intra_rank);
MPI_Comm_size(intra_comm, &intra_nproc);
IF_VERBOSE(intra_rank == 0, ("%s: TEST no accept case, %d nprocs in group\n",
(gid == SERVER_GID) ? "server" : "client", intra_nproc));
open_and_bcast_port(intra_rank, gid, &port);
/* client group */
if (gid == CLIENT_GID) {
IF_VERBOSE(intra_rank == 0,
("client: case 1 - connecting to <%s> with default timeout.\n", port));
mpi_errno = MPI_Comm_connect(port, MPI_INFO_NULL, 0, intra_comm, &comm);
errs += check_errno(mpi_errno, MPI_ERR_PORT);
MPI_Info_create(&info);
MPI_Info_set(info, "timeout", TIMEOUT);
IF_VERBOSE(intra_rank == 0,
("client: case 2 - connecting to <%s> with specified timeout <%s>s.\n", port,
TIMEOUT));
mpi_errno = MPI_Comm_connect(port, info, 0, intra_comm, &comm);
errs += check_errno(mpi_errno, MPI_ERR_PORT);
MPI_Info_free(&info);
}
MPI_Barrier(MPI_COMM_WORLD);
/* server closes port after client finished connection */
if (intra_rank == 0 && gid == SERVER_GID) {
IF_VERBOSE(1, ("server root: closing port.\n"));
MPI_Close_port(port);
}
return errs;
}
int main(int argc, char *argv[])
{
MPI_Comm intra_comm = MPI_COMM_NULL;
int errs = 0;
if (getenv("MPITEST_VERBOSE")) {
verbose = 1;
}
MTest_Init(&argc, &argv);
MPI_Comm_size(MPI_COMM_WORLD, &nproc);
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
if (nproc < 2) {
printf("At least two processes needed to run this test.\n");
goto exit;
}
/* Separate all processes into a server group and a client group.
* Processes in client group connect to server group. */
MPI_Comm_split(MPI_COMM_WORLD, rank % 2, rank, &intra_comm);
MPI_Comm_set_errhandler(intra_comm, MPI_ERRORS_RETURN);
errs = RUN_TEST(intra_comm, rank % 2);
MPI_Comm_free(&intra_comm);
exit:
MTest_Finalize(errs);
return MTestReturnValue(errs);
}
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