X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/4420c38c30ced71915b4d928ed1dc674506645cf..6f065c16d0eca6e4d75c009fc578e59c30b3f392:/src/simgrid/sg_config.c

diff --git a/src/simgrid/sg_config.c b/src/simgrid/sg_config.c
index ea06b592e3..b5f11e3b9d 100644
--- a/src/simgrid/sg_config.c
+++ b/src/simgrid/sg_config.c
@@ -67,6 +67,7 @@ static void sg_config_cmd_line(int *argc, char **argv)
 "Each of these configurations can be used by adding\n"
 "    --cfg=<option name>:<option value>\n"
 "to the command line.\n"
+"\n"
 "You can also use --help-models to see the details of all models known by this simulator.\n"
 #ifdef HAVE_TRACING
 "\n"
@@ -257,6 +258,11 @@ static void _sg_cfg_cb__maxmin_precision(const char* name, int pos)
   sg_maxmin_precision = xbt_cfg_get_double(_sg_cfg_set, name);
 }
 
+static void _sg_cfg_cb__surf_precision(const char* name, int pos)
+{
+  sg_surf_precision = xbt_cfg_get_double(_sg_cfg_set, name);
+}
+
 static void _sg_cfg_cb__sender_gap(const char* name, int pos)
 {
   sg_sender_gap = xbt_cfg_get_double(_sg_cfg_set, name);
@@ -387,6 +393,12 @@ static void _sg_cfg_cb_context_stack_size(const char *name, int pos)
   smx_context_stack_size = xbt_cfg_get_int(_sg_cfg_set, name) * 1024;
 }
 
+static void _sg_cfg_cb_context_guard_size(const char *name, int pos)
+{
+  smx_context_guard_size_was_set = 1;
+  smx_context_guard_size = xbt_cfg_get_int(_sg_cfg_set, name) * xbt_pagesize;
+}
+
 static void _sg_cfg_cb_contexts_nthreads(const char *name, int pos)
 {
   SIMIX_context_set_nthreads(xbt_cfg_get_int(_sg_cfg_set, name));
@@ -447,105 +459,77 @@ static void _sg_cfg_cb__gtnets_jitter_seed(const char *name, int pos)
 }
 #endif
 
+/* build description line with possible values */
+static void describe_model(char *result,
+                           const s_surf_model_description_t model_description[],
+                           const char *name,
+                           const char *description)
+{
+  char *p = result +
+    sprintf(result, "%s. Possible values: %s", description,
+            model_description[0].name ? model_description[0].name : "n/a");
+  int i;
+  for (i = 1; model_description[i].name; i++)
+    p += sprintf(p, ", %s", model_description[i].name);
+  sprintf(p,
+      ".\n       (use 'help' as a value to see the long description of each %s)",
+          name);
+}
+
 /* create the config set, register what should be and parse the command line*/
 void sg_config_init(int *argc, char **argv)
 {
-  char *description = xbt_malloc(1024);
-  char *p;
-  int i;
+  char description[1024];
 
   /* Create the configuration support */
   if (_sg_cfg_init_status == 0) { /* Only create stuff if not already inited */
 
-	/* Plugins configuration */
-
-	sprintf(description,
-	        "The plugins. Possible values: ");
-	      p = description;
-	while (*(++p) != '\0');
-	for (i = 0; surf_plugin_description[i].name; i++)
-	  p += sprintf(p, "%s%s", (i == 0 ? "" : ", "),
-	               surf_plugin_description[i].name);
-	sprintf(p,
-	        ".\n       (use 'help' as a value to see the long description of each plugin)");
-	xbt_cfg_register(&_sg_cfg_set, "plugin", description,
-	                 xbt_cfgelm_string, 1, 1, &_sg_cfg_cb__plugin, NULL);
-
-    sprintf(description,
-            "The model to use for the CPU. Possible values: ");
-    p = description;
-    while (*(++p) != '\0');
-    for (i = 0; surf_cpu_model_description[i].name; i++)
-      p += sprintf(p, "%s%s", (i == 0 ? "" : ", "),
-                   surf_cpu_model_description[i].name);
-    sprintf(p,
-            ".\n       (use 'help' as a value to see the long description of each model)");
+    /* Plugins configuration */
+    describe_model(description, surf_plugin_description,
+                   "plugin", "The plugins");
+    xbt_cfg_register(&_sg_cfg_set, "plugin", description,
+                     xbt_cfgelm_string, 0, 1, &_sg_cfg_cb__plugin, NULL);
+
+    describe_model(description, surf_cpu_model_description,
+                   "model", "The model to use for the CPU");
     xbt_cfg_register(&_sg_cfg_set, "cpu/model", description,
                      xbt_cfgelm_string, 1, 1, &_sg_cfg_cb__cpu_model, NULL);
     xbt_cfg_setdefault_string(_sg_cfg_set, "cpu/model", "Cas01");
 
-    while (*(++p) != '\0');
-    for (i = 0; surf_optimization_mode_description[i].name; i++)
-      p += sprintf(p, "%s%s", (i == 0 ? "" : ", "),
-                   surf_optimization_mode_description[i].name);
-    sprintf(p,
-            ".\n       (use 'help' as a value to see the long description of each optimization mode)");
+    describe_model(description, surf_optimization_mode_description,
+                   "optimization mode",
+                   "The optimization modes to use for the CPU");
     xbt_cfg_register(&_sg_cfg_set, "cpu/optim", description,
                      xbt_cfgelm_string, 1, 1, &_sg_cfg_cb__optimization_mode, NULL);
     xbt_cfg_setdefault_string(_sg_cfg_set, "cpu/optim", "Lazy");
 
-    sprintf(description,
-            "The model to use for the storage. Possible values: ");
-    p = description;
-    while (*(++p) != '\0');
-    for (i = 0; surf_storage_model_description[i].name; i++)
-      p += sprintf(p, "%s%s", (i == 0 ? "" : ", "),
-                   surf_storage_model_description[i].name);
-    sprintf(p,
-            ".\n       (use 'help' as a value to see the long description of each model)");
+    describe_model(description, surf_storage_model_description,
+                   "model", "The model to use for the storage");
     xbt_cfg_register(&_sg_cfg_set, "storage/model", description,
                      xbt_cfgelm_string, 1, 1, &_sg_cfg_cb__storage_mode, NULL);
     xbt_cfg_setdefault_string(_sg_cfg_set, "storage/model", "default");
 
-    sprintf(description,
-            "The model to use for the network. Possible values: ");
-    p = description;
-    while (*(++p) != '\0');
-    for (i = 0; surf_network_model_description[i].name; i++)
-      p += sprintf(p, "%s%s", (i == 0 ? "" : ", "),
-                   surf_network_model_description[i].name);
-    sprintf(p,
-            ".\n       (use 'help' as a value to see the long description of each model)");
+    describe_model(description, surf_network_model_description,
+                   "model", "The model to use for the network");
     xbt_cfg_register(&_sg_cfg_set, "network/model", description,
                      xbt_cfgelm_string, 1, 1, &_sg_cfg_cb__network_model, NULL);
     xbt_cfg_setdefault_string(_sg_cfg_set, "network/model", "LV08");
 
-    sprintf(description,
-            "The optimization modes to use for the network. Possible values: ");
-    p = description;
-    while (*(++p) != '\0');
-    for (i = 0; surf_optimization_mode_description[i].name; i++)
-      p += sprintf(p, "%s%s", (i == 0 ? "" : ", "),
-                   surf_optimization_mode_description[i].name);
-    sprintf(p,
-            ".\n       (use 'help' as a value to see the long description of each optimization mode)");
+    describe_model(description, surf_optimization_mode_description,
+                   "optimization mode",
+                   "The optimization modes to use for the network");
     xbt_cfg_register(&_sg_cfg_set, "network/optim", description,
                      xbt_cfgelm_string, 1, 1, &_sg_cfg_cb__optimization_mode, NULL);
     xbt_cfg_setdefault_string(_sg_cfg_set, "network/optim", "Lazy");
 
-    sprintf(description,
-            "The model to use for the workstation. Possible values: ");
-    p = description;
-    while (*(++p) != '\0');
-    for (i = 0; surf_workstation_model_description[i].name; i++)
-      p += sprintf(p, "%s%s", (i == 0 ? "" : ", "),
-                   surf_workstation_model_description[i].name);
-    sprintf(p,
-            ".\n       (use 'help' as a value to see the long description of each model)");
+    describe_model(description, surf_workstation_model_description,
+                   "model", "The model to use for the workstation");
     xbt_cfg_register(&_sg_cfg_set, "workstation/model", description,
                      xbt_cfgelm_string, 1, 1, &_sg_cfg_cb__workstation_model, NULL);
     xbt_cfg_setdefault_string(_sg_cfg_set, "workstation/model", "default");
 
+    describe_model(description, surf_vm_workstation_model_description,
+                   "model", "The model to use for the vm workstation");
     xbt_cfg_register(&_sg_cfg_set, "vm_workstation/model", description,
                      xbt_cfgelm_string, 1, 1, &_sg_cfg_cb__vm_workstation_model, NULL);
     xbt_cfg_setdefault_string(_sg_cfg_set, "vm_workstation/model", "default");
@@ -555,8 +539,13 @@ void sg_config_init(int *argc, char **argv)
                      xbt_cfgelm_double, 1, 1, _sg_cfg_cb__tcp_gamma, NULL);
     xbt_cfg_setdefault_double(_sg_cfg_set, "network/TCP_gamma", 4194304.0);
 
+    xbt_cfg_register(&_sg_cfg_set, "surf/precision",
+                     "Numerical precision used when updating simulation times (hence this value is expressed in seconds)",
+                     xbt_cfgelm_double, 1, 1, _sg_cfg_cb__surf_precision, NULL);
+    xbt_cfg_setdefault_double(_sg_cfg_set, "surf/precision", 0.00001);
+
     xbt_cfg_register(&_sg_cfg_set, "maxmin/precision",
-                     "Numerical precision used when updating simulation models (epsilon in double comparisons)",
+                     "Numerical precision used when computing resource sharing (hence this value is expressed in ops/sec or bytes/sec)",
                      xbt_cfgelm_double, 1, 1, _sg_cfg_cb__maxmin_precision, NULL);
     xbt_cfg_setdefault_double(_sg_cfg_set, "maxmin/precision", 0.00001);
 
@@ -565,7 +554,8 @@ void sg_config_init(int *argc, char **argv)
     xbt_cfg_register(&_sg_cfg_set, "network/sender_gap",
                      "Minimum gap between two overlapping sends",
                      xbt_cfgelm_double, 1, 1, _sg_cfg_cb__sender_gap, NULL);
-    /* default for "network/sender_gap" is set in network.c */
+    /* real default for "network/sender_gap" is set in network_smpi.cpp */
+    xbt_cfg_setdefault_double(_sg_cfg_set, "network/sender_gap", NAN);
 
     xbt_cfg_register(&_sg_cfg_set, "network/latency_factor",
                      "Correction factor to apply to the provided latency (default value set by network model)",
@@ -580,105 +570,152 @@ void sg_config_init(int *argc, char **argv)
     xbt_cfg_register(&_sg_cfg_set, "network/weight_S",
                      "Correction factor to apply to the weight of competing streams (default value set by network model)",
                      xbt_cfgelm_double, 1, 1, _sg_cfg_cb__weight_S, NULL);
-    /* default for "network/weight_S" is set in network.c */
+    /* real default for "network/weight_S" is set in network_*.cpp */
+    xbt_cfg_setdefault_double(_sg_cfg_set, "network/weight_S", NAN);
 
     /* Inclusion path */
     xbt_cfg_register(&_sg_cfg_set, "path",
                      "Lookup path for inclusions in platform and deployment XML files",
-                     xbt_cfgelm_string, 0, 0, _sg_cfg_cb__surf_path, NULL);
+                     xbt_cfgelm_string, 1, 0, _sg_cfg_cb__surf_path, NULL);
 
     xbt_cfg_register(&_sg_cfg_set, "cpu/maxmin_selective_update",
                      "Update the constraint set propagating recursively to others constraints (off by default when optim is set to lazy)",
-                     xbt_cfgelm_boolean, 0, 1, NULL, NULL);
+                     xbt_cfgelm_boolean, 1, 1, NULL, NULL);
     xbt_cfg_setdefault_boolean(_sg_cfg_set, "cpu/maxmin_selective_update", "no");
 
     xbt_cfg_register(&_sg_cfg_set, "network/maxmin_selective_update",
                      "Update the constraint set propagating recursively to others constraints (off by default when optim is set to lazy)",
-                     xbt_cfgelm_boolean, 0, 1, NULL, NULL);
+                     xbt_cfgelm_boolean, 1, 1, NULL, NULL);
     xbt_cfg_setdefault_boolean(_sg_cfg_set, "network/maxmin_selective_update", "no");
 
 #ifdef HAVE_MC
     /* do model-checking */
     xbt_cfg_register(&_sg_cfg_set, "model-check",
                      "Verify the system through model-checking instead of simulating it (EXPERIMENTAL)",
-                     xbt_cfgelm_boolean, 0, 1, _sg_cfg_cb_model_check, NULL);
+                     xbt_cfgelm_boolean, 1, 1, _sg_cfg_cb_model_check, NULL);
     xbt_cfg_setdefault_boolean(_sg_cfg_set, "model-check", "no");
 
     /* do stateful model-checking */
     xbt_cfg_register(&_sg_cfg_set, "model-check/checkpoint",
                      "Specify the amount of steps between checkpoints during stateful model-checking (default: 0 => stateless verification). "
-                     "If value=on, one checkpoint is saved for each step => faster verification, but huge memory consumption; higher values are good compromises between speed and memory consumption.",
-                     xbt_cfgelm_int, 0, 1, _mc_cfg_cb_checkpoint, NULL);
+                     "If value=1, one checkpoint is saved for each step => faster verification, but huge memory consumption; higher values are good compromises between speed and memory consumption.",
+                     xbt_cfgelm_int, 1, 1, _mc_cfg_cb_checkpoint, NULL);
     xbt_cfg_setdefault_int(_sg_cfg_set, "model-check/checkpoint", 0);
 
+    /* do stateful model-checking */
+    xbt_cfg_register(&_sg_cfg_set, "model-check/sparse-checkpoint",
+                     "Use sparse per-page snapshots.",
+                     xbt_cfgelm_boolean, 1, 1, _mc_cfg_cb_sparse_checkpoint, NULL);
+    xbt_cfg_setdefault_boolean(_sg_cfg_set, "model-check/sparse-checkpoint", "no");
+
+    /* do stateful model-checking */
+    xbt_cfg_register(&_sg_cfg_set, "model-check/soft-dirty",
+                     "Use sparse per-page snapshots.",
+                     xbt_cfgelm_boolean, 1, 1, _mc_cfg_cb_soft_dirty, NULL);
+    xbt_cfg_setdefault_boolean(_sg_cfg_set, "model-check/soft-dirty", "no");
+
     /* do liveness model-checking */
     xbt_cfg_register(&_sg_cfg_set, "model-check/property",
                      "Specify the name of the file containing the property. It must be the result of the ltl2ba program.",
-                     xbt_cfgelm_string, 0, 1, _mc_cfg_cb_property, NULL);
+                     xbt_cfgelm_string, 1, 1, _mc_cfg_cb_property, NULL);
     xbt_cfg_setdefault_string(_sg_cfg_set, "model-check/property", "");
 
+    /* do communications determinism model-checking */
+    xbt_cfg_register(&_sg_cfg_set, "model-check/communications_determinism",
+                     "Enable/disable the detection of determinism in the communications schemes",
+                     xbt_cfgelm_boolean, 1, 1, _mc_cfg_cb_comms_determinism, NULL);
+    xbt_cfg_setdefault_boolean(_sg_cfg_set, "model-check/communications_determinism", "no");
+
+    /* do send determinism model-checking */
+    xbt_cfg_register(&_sg_cfg_set, "model-check/send_determinism",
+                     "Enable/disable the detection of send-determinism in the communications schemes",
+                     xbt_cfgelm_boolean, 1, 1, _mc_cfg_cb_send_determinism, NULL);
+    xbt_cfg_setdefault_boolean(_sg_cfg_set, "model-check/send_determinism", "no");
+
     /* Specify the kind of model-checking reduction */
     xbt_cfg_register(&_sg_cfg_set, "model-check/reduction",
                      "Specify the kind of exploration reduction (either none or DPOR)",
-                     xbt_cfgelm_string, 0, 1, _mc_cfg_cb_reduce, NULL);
+                     xbt_cfgelm_string, 1, 1, _mc_cfg_cb_reduce, NULL);
     xbt_cfg_setdefault_string(_sg_cfg_set, "model-check/reduction", "dpor");
 
     /* Enable/disable timeout for wait requests with model-checking */
     xbt_cfg_register(&_sg_cfg_set, "model-check/timeout",
                      "Enable/Disable timeout for wait requests",
-                     xbt_cfgelm_boolean, 0, 1, _mc_cfg_cb_timeout, NULL);
+                     xbt_cfgelm_boolean, 1, 1, _mc_cfg_cb_timeout, NULL);
     xbt_cfg_setdefault_boolean(_sg_cfg_set, "model-check/timeout", "no");
 
+    /* Enable/disable global hash computation with model-checking */
+    xbt_cfg_register(&_sg_cfg_set, "model-check/hash",
+                     "Enable/Disable state hash for state comparison (exprimental)",
+                     xbt_cfgelm_boolean, 1, 1, _mc_cfg_cb_hash, NULL);
+    xbt_cfg_setdefault_boolean(_sg_cfg_set, "model-check/hash", "no");
+
     /* Set max depth exploration */
     xbt_cfg_register(&_sg_cfg_set, "model-check/max_depth",
                      "Specify the max depth of exploration (default : 1000)",
-                     xbt_cfgelm_int, 0, 1, _mc_cfg_cb_max_depth, NULL);
+                     xbt_cfgelm_int, 1, 1, _mc_cfg_cb_max_depth, NULL);
     xbt_cfg_setdefault_int(_sg_cfg_set, "model-check/max_depth", 1000);
 
     /* Set number of visited state stored for state comparison reduction*/
     xbt_cfg_register(&_sg_cfg_set, "model-check/visited",
                      "Specify the number of visited state stored for state comparison reduction. If value=5, the last 5 visited states are stored",
-                     xbt_cfgelm_int, 0, 1, _mc_cfg_cb_visited, NULL);
+                     xbt_cfgelm_int, 1, 1, _mc_cfg_cb_visited, NULL);
     xbt_cfg_setdefault_int(_sg_cfg_set, "model-check/visited", 0);
 
     /* Set file name for dot output of graph state */
     xbt_cfg_register(&_sg_cfg_set, "model-check/dot_output",
                      "Specify the name of dot file corresponding to graph state",
-                     xbt_cfgelm_string, 0, 1, _mc_cfg_cb_dot_output, NULL);
+                     xbt_cfgelm_string, 1, 1, _mc_cfg_cb_dot_output, NULL);
     xbt_cfg_setdefault_string(_sg_cfg_set, "model-check/dot_output", "");
 #endif
 
     /* do verbose-exit */
     xbt_cfg_register(&_sg_cfg_set, "verbose-exit",
                      "Activate the \"do nothing\" mode in Ctrl-C",
-                     xbt_cfgelm_boolean, 0, 1, _sg_cfg_cb_verbose_exit, NULL);
+                     xbt_cfgelm_boolean, 1, 1, _sg_cfg_cb_verbose_exit, NULL);
     xbt_cfg_setdefault_boolean(_sg_cfg_set, "verbose-exit", "yes");
 
     /* context factory */
-    sprintf(description,
-            "Context factory to use in SIMIX. Possible values: thread");
     const char *dflt_ctx_fact = "thread";
+    {
+      char *p = description +
+        sprintf(description,
+                "Context factory to use in SIMIX. Possible values: %s",
+                dflt_ctx_fact);
 #ifdef CONTEXT_UCONTEXT
-    dflt_ctx_fact = "ucontext";
-    strcat(strcat(description, ", "), dflt_ctx_fact);
+      dflt_ctx_fact = "ucontext";
+      p += sprintf(p, ", %s", dflt_ctx_fact);
 #endif
 #ifdef HAVE_RAWCTX
-    dflt_ctx_fact = "raw";
-    strcat(strcat(description, ", "), dflt_ctx_fact);
+      dflt_ctx_fact = "raw";
+      p += sprintf(p, ", %s", dflt_ctx_fact);
 #endif
-    strcat(description, ".");
+      sprintf(p, ".");
+    }
     xbt_cfg_register(&_sg_cfg_set, "contexts/factory", description,
                      xbt_cfgelm_string, 1, 1, _sg_cfg_cb_context_factory, NULL);
     xbt_cfg_setdefault_string(_sg_cfg_set, "contexts/factory", dflt_ctx_fact);
 
-    /* stack size of contexts in Ko */
+    /* stack size of contexts in KiB */
     xbt_cfg_register(&_sg_cfg_set, "contexts/stack_size",
-                     "Stack size of contexts in Kib",
+                     "Stack size of contexts in KiB",
                      xbt_cfgelm_int, 1, 1, _sg_cfg_cb_context_stack_size, NULL);
-    xbt_cfg_setdefault_int(_sg_cfg_set, "contexts/stack_size", 128);
+    xbt_cfg_setdefault_int(_sg_cfg_set, "contexts/stack_size", 8*1024);
     /* No, it was not set yet (the above setdefault() changed this to 1). */
     smx_context_stack_size_was_set = 0;
 
+    /* guard size for contexts stacks in memory pages */
+    xbt_cfg_register(&_sg_cfg_set, "contexts/guard_size",
+                     "Guard size for contexts stacks in memory pages",
+                     xbt_cfgelm_int, 1, 1, _sg_cfg_cb_context_guard_size, NULL);
+#if defined(_XBT_WIN32) || (PTH_STACKGROWTH != -1)
+    xbt_cfg_setdefault_int(_sg_cfg_set, "contexts/guard_size", 0);
+#else
+    xbt_cfg_setdefault_int(_sg_cfg_set, "contexts/guard_size", 1);
+#endif
+    /* No, it was not set yet (the above setdefault() changed this to 1). */
+    smx_context_guard_size_was_set = 0;
+
     /* number of parallel threads for user processes */
     xbt_cfg_register(&_sg_cfg_set, "contexts/nthreads",
                      "Number of parallel threads used to execute user contexts",
@@ -708,7 +745,7 @@ void sg_config_init(int *argc, char **argv)
 
     xbt_cfg_register(&_sg_cfg_set, "network/crosstraffic",
                      "Activate the interferences between uploads and downloads for fluid max-min models (LV08, CM02)",
-                     xbt_cfgelm_boolean, 0, 1, _sg_cfg_cb__surf_network_crosstraffic, NULL);
+                     xbt_cfgelm_boolean, 1, 1, _sg_cfg_cb__surf_network_crosstraffic, NULL);
     xbt_cfg_setdefault_boolean(_sg_cfg_set, "network/crosstraffic", "no");
 
 #ifdef HAVE_GTNETS
@@ -740,6 +777,11 @@ void sg_config_init(int *argc, char **argv)
                      xbt_cfgelm_boolean, 1, 1, NULL, NULL);
     xbt_cfg_setdefault_boolean(_sg_cfg_set, "smpi/display_timing", "no");
 
+    xbt_cfg_register(&_sg_cfg_set, "smpi/simulate_computation",
+                     "Boolean indicating whether the computational part of the simulated application should be simulated.",
+                     xbt_cfgelm_boolean, 1, 1, NULL, NULL);
+    xbt_cfg_setdefault_boolean(_sg_cfg_set, "smpi/simulate_computation", "yes");
+
     xbt_cfg_register(&_sg_cfg_set, "smpi/use_shared_malloc",
                      "Boolean indicating whether we should use shared memory when using SMPI_SHARED_MALLOC. Allows user to disable it for debug purposes.",
                      xbt_cfgelm_boolean, 1, 1, NULL, NULL);
@@ -760,6 +802,11 @@ void sg_config_init(int *argc, char **argv)
                      xbt_cfgelm_int, 1, 1, NULL, NULL);
     xbt_cfg_setdefault_int(_sg_cfg_set, "smpi/send_is_detached_thres", 65536);
 
+    xbt_cfg_register(&_sg_cfg_set, "smpi/privatize_global_variables",
+                     "Boolean indicating whether we should privatize global variable at runtime.",
+                     xbt_cfgelm_boolean, 1, 1, NULL, NULL);
+    xbt_cfg_setdefault_boolean(_sg_cfg_set, "smpi/privatize_global_variables", "no");
+
     //For smpi/bw_factor and smpi/lat_factor
     //Default value have to be "threshold0:value0;threshold1:value1;...;thresholdN:valueN"
     //test is if( size >= thresholdN ) return valueN;
@@ -789,10 +836,12 @@ void sg_config_init(int *argc, char **argv)
                      "Small messages timings (MPI_Recv minimum time for small messages)",
                      xbt_cfgelm_string, 1, 1, NULL, NULL);
     xbt_cfg_setdefault_string(_sg_cfg_set, "smpi/or", "1:0:0:0:0");
+
     xbt_cfg_register(&_sg_cfg_set, "smpi/iprobe",
                      "Minimum time to inject inside a call to MPI_Iprobe",
                      xbt_cfgelm_double, 1, 1, NULL, NULL);
     xbt_cfg_setdefault_double(_sg_cfg_set, "smpi/iprobe", 1e-4);
+
     xbt_cfg_register(&_sg_cfg_set, "smpi/coll_selector",
                      "Which collective selector to use",
                      xbt_cfgelm_string, 1, 1, NULL, NULL);
@@ -800,47 +849,47 @@ void sg_config_init(int *argc, char **argv)
 
     xbt_cfg_register(&_sg_cfg_set, "smpi/gather",
                      "Which collective to use for gather",
-                     xbt_cfgelm_string, 1, 1, &_sg_cfg_cb__coll_gather, NULL);
+                     xbt_cfgelm_string, 0, 1, &_sg_cfg_cb__coll_gather, NULL);
 
     xbt_cfg_register(&_sg_cfg_set, "smpi/allgather",
                      "Which collective to use for allgather",
-                     xbt_cfgelm_string, 1, 1, &_sg_cfg_cb__coll_allgather, NULL);
+                     xbt_cfgelm_string, 0, 1, &_sg_cfg_cb__coll_allgather, NULL);
 
     xbt_cfg_register(&_sg_cfg_set, "smpi/barrier",
                      "Which collective to use for barrier",
-                     xbt_cfgelm_string, 1, 1, &_sg_cfg_cb__coll_barrier, NULL);
+                     xbt_cfgelm_string, 0, 1, &_sg_cfg_cb__coll_barrier, NULL);
 
     xbt_cfg_register(&_sg_cfg_set, "smpi/reduce_scatter",
                      "Which collective to use for reduce_scatter",
-                     xbt_cfgelm_string, 1, 1, &_sg_cfg_cb__coll_reduce_scatter, NULL);
+                     xbt_cfgelm_string, 0, 1, &_sg_cfg_cb__coll_reduce_scatter, NULL);
 
     xbt_cfg_register(&_sg_cfg_set, "smpi/scatter",
                      "Which collective to use for scatter",
-                     xbt_cfgelm_string, 1, 1, &_sg_cfg_cb__coll_scatter, NULL);
+                     xbt_cfgelm_string, 0, 1, &_sg_cfg_cb__coll_scatter, NULL);
 
     xbt_cfg_register(&_sg_cfg_set, "smpi/allgatherv",
                      "Which collective to use for allgatherv",
-                     xbt_cfgelm_string, 1, 1, &_sg_cfg_cb__coll_allgatherv, NULL);
+                     xbt_cfgelm_string, 0, 1, &_sg_cfg_cb__coll_allgatherv, NULL);
 
     xbt_cfg_register(&_sg_cfg_set, "smpi/allreduce",
                      "Which collective to use for allreduce",
-                     xbt_cfgelm_string, 1, 1, &_sg_cfg_cb__coll_allreduce, NULL);
+                     xbt_cfgelm_string, 0, 1, &_sg_cfg_cb__coll_allreduce, NULL);
 
     xbt_cfg_register(&_sg_cfg_set, "smpi/alltoall",
                      "Which collective to use for alltoall",
-                     xbt_cfgelm_string, 1, 1, &_sg_cfg_cb__coll_alltoall, NULL);
+                     xbt_cfgelm_string, 0, 1, &_sg_cfg_cb__coll_alltoall, NULL);
 
     xbt_cfg_register(&_sg_cfg_set, "smpi/alltoallv",
                      "Which collective to use for alltoallv",
-                     xbt_cfgelm_string, 1, 1, &_sg_cfg_cb__coll_alltoallv, NULL);
+                     xbt_cfgelm_string, 0, 1, &_sg_cfg_cb__coll_alltoallv, NULL);
 
     xbt_cfg_register(&_sg_cfg_set, "smpi/bcast",
                      "Which collective to use for bcast",
-                     xbt_cfgelm_string, 1, 1, &_sg_cfg_cb__coll_bcast, NULL);
+                     xbt_cfgelm_string, 0, 1, &_sg_cfg_cb__coll_bcast, NULL);
 
     xbt_cfg_register(&_sg_cfg_set, "smpi/reduce",
                      "Which collective to use for reduce",
-                     xbt_cfgelm_string, 1, 1, &_sg_cfg_cb__coll_reduce, NULL);
+                     xbt_cfgelm_string, 0, 1, &_sg_cfg_cb__coll_reduce, NULL);
 #endif // HAVE_SMPI
 
     xbt_cfg_register(&_sg_cfg_set, "clean_atexit",
@@ -858,6 +907,7 @@ void sg_config_init(int *argc, char **argv)
       xbt_cfg_setdefault_string(_sg_cfg_set, "path", initial_path);
     }
 
+    xbt_cfg_check(_sg_cfg_set);
     _sg_cfg_init_status = 1;
 
     sg_config_cmd_line(argc, argv);
@@ -867,8 +917,6 @@ void sg_config_init(int *argc, char **argv)
   } else {
     XBT_WARN("Call to sg_config_init() after initialization ignored");
   }
-
-  xbt_free(description);
 }
 
 void sg_config_finalize(void)
@@ -927,13 +975,17 @@ void surf_config_models_setup()
     xbt_assert(network_model_name,
                 "Set a network model to use with the 'compound' workstation model");
 
+    if(surf_cpu_model_init_preparse){
+      surf_cpu_model_init_preparse();
+    } else {
+      cpu_id =
+          find_model_description(surf_cpu_model_description, cpu_model_name);
+      surf_cpu_model_description[cpu_id].model_init_preparse();
+    }
+
     network_id =
         find_model_description(surf_network_model_description,
                                network_model_name);
-    cpu_id =
-        find_model_description(surf_cpu_model_description, cpu_model_name);
-
-    surf_cpu_model_description[cpu_id].model_init_preparse();
     surf_network_model_description[network_id].model_init_preparse();
   }