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39 #include "basenetwork.h"
55 #include "gromacs/utility/cstringutil.h"
56 #include "gromacs/utility/fatalerror.h"
57 #include "gromacs/utility/gmxmpi.h"
58 #include "gromacs/utility/programcontext.h"
60 int gmx_gethostname(char *name, size_t len)
64 gmx_incons("gmx_gethostname called with len<8");
66 #if defined(HAVE_UNISTD_H) && !defined(__native_client__)
67 if (gethostname(name, len-1) != 0)
69 std::strncpy(name, "unknown", 8);
74 std::strncpy(name, "unknown", 8);
79 gmx_bool gmx_mpi_initialized(void)
91 int gmx_node_num(void)
97 if (!gmx_mpi_initialized())
103 (void) MPI_Comm_size(MPI_COMM_WORLD, &i);
108 int gmx_node_rank(void)
113 #ifdef GMX_THREAD_MPI
114 if (!gmx_mpi_initialized())
120 (void) MPI_Comm_rank(MPI_COMM_WORLD, &i);
125 static int mpi_hostname_hash(void)
130 /* We have a single physical node */
134 char mpi_hostname[MPI_MAX_PROCESSOR_NAME];
136 /* This procedure can only differentiate nodes with different names.
137 * Architectures where different physical nodes have identical names,
138 * such as IBM Blue Gene, should use an architecture specific solution.
140 MPI_Get_processor_name(mpi_hostname, &resultlen);
142 /* The string hash function returns an unsigned int. We cast to an int.
143 * Negative numbers are converted to positive by setting the sign bit to 0.
144 * This makes the hash one bit smaller.
145 * A 63-bit hash (with 64-bit int) should be enough for unique node hashes,
146 * even on a million node machine. 31 bits might not be enough though!
149 (int)gmx_string_fullhash_func(mpi_hostname, gmx_string_hash_init);
159 #if defined GMX_LIB_MPI && defined GMX_TARGET_BGQ
160 #include <spi/include/kernel/location.h>
162 static int bgq_nodenum(void)
165 Personality_t personality;
166 Kernel_GetPersonality(&personality, sizeof(personality));
167 /* Each MPI rank has a unique coordinate in a 6-dimensional space
168 (A,B,C,D,E,T), with dimensions A-E corresponding to different
169 physical nodes, and T within each node. Each node has sixteen
170 physical cores, each of which can have up to four hardware
171 threads, so 0 <= T <= 63 (but the maximum value of T depends on
172 the confituration of ranks and OpenMP threads per
173 node). However, T is irrelevant for computing a suitable return
174 value for gmx_hostname_num().
176 hostnum = personality.Network_Config.Acoord;
177 hostnum *= personality.Network_Config.Bnodes;
178 hostnum += personality.Network_Config.Bcoord;
179 hostnum *= personality.Network_Config.Cnodes;
180 hostnum += personality.Network_Config.Ccoord;
181 hostnum *= personality.Network_Config.Dnodes;
182 hostnum += personality.Network_Config.Dcoord;
183 hostnum *= personality.Network_Config.Enodes;
184 hostnum += personality.Network_Config.Ecoord;
189 "Torus ID A: %d / %d B: %d / %d C: %d / %d D: %d / %d E: %d / %d\n"
190 "Node ID T: %d / %d core: %d / %d hardware thread: %d / %d\n",
191 personality.Network_Config.Acoord,
192 personality.Network_Config.Anodes,
193 personality.Network_Config.Bcoord,
194 personality.Network_Config.Bnodes,
195 personality.Network_Config.Ccoord,
196 personality.Network_Config.Cnodes,
197 personality.Network_Config.Dcoord,
198 personality.Network_Config.Dnodes,
199 personality.Network_Config.Ecoord,
200 personality.Network_Config.Enodes,
201 Kernel_ProcessorCoreID(),
203 Kernel_ProcessorID(),
205 Kernel_ProcessorThreadID(),
212 int gmx_physicalnode_id_hash(void)
219 #ifdef GMX_THREAD_MPI
220 /* thread-MPI currently puts the thread number in the process name,
221 * we might want to change this, as this is inconsistent with what
222 * most MPI implementations would do when running on a single node.
226 #ifdef GMX_TARGET_BGQ
227 hash = bgq_nodenum();
229 hash = mpi_hostname_hash();
236 fprintf(debug, "In gmx_physicalnode_id_hash: hash %d\n", hash);
243 void gmx_abort(int errorno)
245 const char *programName = "GROMACS";
248 programName = gmx::getProgramContext().displayName();
250 catch (const std::exception &)
253 const int nnodes = gmx_node_num();
254 const int noderank = gmx_node_rank();
257 std::fprintf(stderr, "Halting parallel program %s on rank %d out of %d\n",
258 programName, noderank, nnodes);
262 std::fprintf(stderr, "Halting program %s\n", programName);
265 MPI_Abort(MPI_COMM_WORLD, errorno);