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37 #include "basenetwork.h"
53 #include "gromacs/utility/cstringutil.h"
54 #include "gromacs/utility/fatalerror.h"
55 #include "gromacs/utility/gmxmpi.h"
56 #include "gromacs/utility/programcontext.h"
58 int gmx_gethostname(char *name, size_t len)
62 gmx_incons("gmx_gethostname called with len<8");
64 #if defined(HAVE_UNISTD_H) && !defined(__native_client__)
65 if (gethostname(name, len-1) != 0)
67 std::strncpy(name, "unknown", 8);
72 std::strncpy(name, "unknown", 8);
77 gmx_bool gmx_mpi_initialized(void)
89 int gmx_node_num(void)
95 (void) MPI_Comm_size(MPI_COMM_WORLD, &i);
100 int gmx_node_rank(void)
106 (void) MPI_Comm_rank(MPI_COMM_WORLD, &i);
111 #if defined GMX_LIB_MPI && defined GMX_TARGET_BGQ
112 #include <spi/include/kernel/location.h>
115 int gmx_physicalnode_id_hash(void)
120 /* We have a single physical node */
124 char mpi_hostname[MPI_MAX_PROCESSOR_NAME];
126 /* This procedure can only differentiate nodes with different names.
127 * Architectures where different physical nodes have identical names,
128 * such as IBM Blue Gene, should use an architecture specific solution.
130 MPI_Get_processor_name(mpi_hostname, &resultlen);
132 /* The string hash function returns an unsigned int. We cast to an int.
133 * Negative numbers are converted to positive by setting the sign bit to 0.
134 * This makes the hash one bit smaller.
135 * A 63-bit hash (with 64-bit int) should be enough for unique node hashes,
136 * even on a million node machine. 31 bits might not be enough though!
139 (int)gmx_string_fullhash_func(mpi_hostname, gmx_string_hash_init);
149 int gmx_hostname_num()
154 #ifdef GMX_THREAD_MPI
155 /* thread-MPI currently puts the thread number in the process name,
156 * we might want to change this, as this is inconsistent with what
157 * most MPI implementations would do when running on a single node.
161 int resultlen, hostnum, i, j;
162 char mpi_hostname[MPI_MAX_PROCESSOR_NAME], hostnum_str[MPI_MAX_PROCESSOR_NAME];
164 MPI_Get_processor_name(mpi_hostname, &resultlen);
165 #ifdef GMX_TARGET_BGQ
166 Personality_t personality;
167 Kernel_GetPersonality(&personality, sizeof(personality));
168 /* Each MPI rank has a unique coordinate in a 6-dimensional space
169 (A,B,C,D,E,T), with dimensions A-E corresponding to different
170 physical nodes, and T within each node. Each node has sixteen
171 physical cores, each of which can have up to four hardware
172 threads, so 0 <= T <= 63 (but the maximum value of T depends on
173 the confituration of ranks and OpenMP threads per
174 node). However, T is irrelevant for computing a suitable return
175 value for gmx_hostname_num().
177 hostnum = personality.Network_Config.Acoord;
178 hostnum *= personality.Network_Config.Bnodes;
179 hostnum += personality.Network_Config.Bcoord;
180 hostnum *= personality.Network_Config.Cnodes;
181 hostnum += personality.Network_Config.Ccoord;
182 hostnum *= personality.Network_Config.Dnodes;
183 hostnum += personality.Network_Config.Dcoord;
184 hostnum *= personality.Network_Config.Enodes;
185 hostnum += personality.Network_Config.Ecoord;
187 /* This procedure can only differentiate nodes with host names
188 * that end on unique numbers.
192 /* Only parse the host name up to the first dot */
193 while (i < resultlen && mpi_hostname[i] != '.')
195 if (std::isdigit(mpi_hostname[i]))
197 hostnum_str[j++] = mpi_hostname[i];
201 hostnum_str[j] = '\0';
208 /* Use only the last 9 decimals, so we don't overflow an int */
209 hostnum = std::strtol(hostnum_str + std::max(0, j-9), NULL, 10);
215 std::fprintf(debug, "In gmx_hostname_num: hostname '%s', hostnum %d\n",
216 mpi_hostname, hostnum);
217 #ifdef GMX_TARGET_BGQ
219 "Torus ID A: %d / %d B: %d / %d C: %d / %d D: %d / %d E: %d / %d\n"
220 "Node ID T: %d / %d core: %d / %d hardware thread: %d / %d\n",
221 personality.Network_Config.Acoord,
222 personality.Network_Config.Anodes,
223 personality.Network_Config.Bcoord,
224 personality.Network_Config.Bnodes,
225 personality.Network_Config.Ccoord,
226 personality.Network_Config.Cnodes,
227 personality.Network_Config.Dcoord,
228 personality.Network_Config.Dnodes,
229 personality.Network_Config.Ecoord,
230 personality.Network_Config.Enodes,
231 Kernel_ProcessorCoreID(),
233 Kernel_ProcessorID(),
235 Kernel_ProcessorThreadID(),
245 void gmx_abort(int errorno)
247 const char *programName = "GROMACS";
250 programName = gmx::getProgramContext().displayName();
252 catch (const std::exception &)
255 const int nnodes = gmx_node_num();
256 const int noderank = gmx_node_rank();
259 std::fprintf(stderr, "Halting parallel program %s on node %d out of %d\n",
260 programName, noderank, nnodes);
264 std::fprintf(stderr, "Halting program %s\n", programName);
267 MPI_Abort(MPI_COMM_WORLD, errorno);