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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 static int mpi_hostname_hash(void)
116 /* We have a single physical node */
120 char mpi_hostname[MPI_MAX_PROCESSOR_NAME];
122 /* This procedure can only differentiate nodes with different names.
123 * Architectures where different physical nodes have identical names,
124 * such as IBM Blue Gene, should use an architecture specific solution.
126 MPI_Get_processor_name(mpi_hostname, &resultlen);
128 /* The string hash function returns an unsigned int. We cast to an int.
129 * Negative numbers are converted to positive by setting the sign bit to 0.
130 * This makes the hash one bit smaller.
131 * A 63-bit hash (with 64-bit int) should be enough for unique node hashes,
132 * even on a million node machine. 31 bits might not be enough though!
135 (int)gmx_string_fullhash_func(mpi_hostname, gmx_string_hash_init);
145 #if defined GMX_LIB_MPI && defined GMX_TARGET_BGQ
146 #include <spi/include/kernel/location.h>
148 static int bgq_nodenum(void)
151 Personality_t personality;
152 Kernel_GetPersonality(&personality, sizeof(personality));
153 /* Each MPI rank has a unique coordinate in a 6-dimensional space
154 (A,B,C,D,E,T), with dimensions A-E corresponding to different
155 physical nodes, and T within each node. Each node has sixteen
156 physical cores, each of which can have up to four hardware
157 threads, so 0 <= T <= 63 (but the maximum value of T depends on
158 the confituration of ranks and OpenMP threads per
159 node). However, T is irrelevant for computing a suitable return
160 value for gmx_hostname_num().
162 hostnum = personality.Network_Config.Acoord;
163 hostnum *= personality.Network_Config.Bnodes;
164 hostnum += personality.Network_Config.Bcoord;
165 hostnum *= personality.Network_Config.Cnodes;
166 hostnum += personality.Network_Config.Ccoord;
167 hostnum *= personality.Network_Config.Dnodes;
168 hostnum += personality.Network_Config.Dcoord;
169 hostnum *= personality.Network_Config.Enodes;
170 hostnum += personality.Network_Config.Ecoord;
175 "Torus ID A: %d / %d B: %d / %d C: %d / %d D: %d / %d E: %d / %d\n"
176 "Node ID T: %d / %d core: %d / %d hardware thread: %d / %d\n",
177 personality.Network_Config.Acoord,
178 personality.Network_Config.Anodes,
179 personality.Network_Config.Bcoord,
180 personality.Network_Config.Bnodes,
181 personality.Network_Config.Ccoord,
182 personality.Network_Config.Cnodes,
183 personality.Network_Config.Dcoord,
184 personality.Network_Config.Dnodes,
185 personality.Network_Config.Ecoord,
186 personality.Network_Config.Enodes,
187 Kernel_ProcessorCoreID(),
189 Kernel_ProcessorID(),
191 Kernel_ProcessorThreadID(),
198 int gmx_physicalnode_id_hash(void)
205 #ifdef GMX_THREAD_MPI
206 /* thread-MPI currently puts the thread number in the process name,
207 * we might want to change this, as this is inconsistent with what
208 * most MPI implementations would do when running on a single node.
212 #ifdef GMX_TARGET_BGQ
213 hash = bgq_nodenum();
215 hash = mpi_hostname_hash();
222 fprintf(debug, "In gmx_physicalnode_id_hash: hash %d\n", hash);
229 void gmx_abort(int errorno)
231 const char *programName = "GROMACS";
234 programName = gmx::getProgramContext().displayName();
236 catch (const std::exception &)
239 const int nnodes = gmx_node_num();
240 const int noderank = gmx_node_rank();
243 std::fprintf(stderr, "Halting parallel program %s on node %d out of %d\n",
244 programName, noderank, nnodes);
248 std::fprintf(stderr, "Halting program %s\n", programName);
251 MPI_Abort(MPI_COMM_WORLD, errorno);