X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/ca219853a75e59f34961591d0abda7d9d091bd74..96920215fe6b67ec41f9e9dee856b5157a67f6d2:/src/simix/smx_context_raw.c

diff --git a/src/simix/smx_context_raw.c b/src/simix/smx_context_raw.c
index afb3cc8e0f..9327b59722 100644
--- a/src/simix/smx_context_raw.c
+++ b/src/simix/smx_context_raw.c
@@ -14,19 +14,6 @@
 #  include <valgrind/valgrind.h>
 #endif                          /* HAVE_VALGRIND_VALGRIND_H */
 
-#ifdef _XBT_WIN32
-#include "win32_ucontext.h"
-#include "win32_ucontext.c"
-#else
-#include "ucontext.h"
-#endif
-
-/* lower this if you want to reduce the memory consumption  */
-#ifndef CONTEXT_STACK_SIZE      /* allow lua to override this */
-#define CONTEXT_STACK_SIZE 128*1024
-#endif                          /*CONTEXT_STACK_SIZE */
-
-
 typedef char * raw_stack_t;
 typedef void (*rawctx_entry_point_t)(void *);
 
@@ -38,6 +25,9 @@ typedef struct s_smx_ctx_raw {
 #ifdef HAVE_VALGRIND_VALGRIND_H
   unsigned int valgrind_stack_id;       /* the valgrind stack id */
 #endif
+#ifdef TIME_BENCH
+  unsigned int thread;  /* Just for measuring purposes */
+#endif
 } s_smx_ctx_raw_t, *smx_ctx_raw_t;
 
 smx_ctx_raw_t maestro_raw_context;
@@ -159,14 +149,38 @@ void raw_swapcontext(raw_stack_t* old, raw_stack_t new) {
 
 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(simix_context);
 
+#ifdef CONTEXT_THREADS
 static xbt_parmap_t parmap;
+#endif
+
+static smx_context_factory_t raw_factory;
+
+#ifdef TIME_BENCH
+#include "xbt/xbt_os_time.h"
+#define NUM_THREADS 4
+static xbt_os_timer_t timer;
+static double time_thread_sr[NUM_THREADS];
+static double time_thread_ssr[NUM_THREADS];
+static double time_wasted_sr = 0;
+static double time_wasted_ssr = 0;
+static unsigned int sr_count = 0;
+static unsigned int ssr_count = 0;
+static char new_sr = 0;
+#endif
 
 static void smx_ctx_raw_wrapper(smx_ctx_raw_t context);
 
 static int smx_ctx_raw_factory_finalize(smx_context_factory_t *factory)
-{ 
+{
+#ifdef TIME_BENCH
+  XBT_CRITICAL("Total wasted time in %u SR: %lf", sr_count, time_wasted_sr);
+  XBT_CRITICAL("Total wasted time in %u SSR: %lf", ssr_count, time_wasted_ssr);
+#endif
+
+#ifdef CONTEXT_THREADS
   if(parmap)
       xbt_parmap_destroy(parmap);
+#endif
   return smx_ctx_base_factory_finalize(factory);
 }
 
@@ -189,15 +203,15 @@ smx_ctx_raw_create_context(xbt_main_func_t code, int argc, char **argv,
   /* If the user provided a function for the process then use it
      otherwise is the context for maestro */
      if (code) {
-       context->malloced_stack = xbt_malloc0(CONTEXT_STACK_SIZE);
+       context->malloced_stack = xbt_malloc0(smx_context_stack_size);
        context->stack_top =
-           raw_makecontext(context->malloced_stack,CONTEXT_STACK_SIZE,
+           raw_makecontext(context->malloced_stack, smx_context_stack_size,
                (void(*)(void*))smx_ctx_raw_wrapper,context);
 
 #ifdef HAVE_VALGRIND_VALGRIND_H
        context->valgrind_stack_id =
            VALGRIND_STACK_REGISTER(context->malloced_stack,
-               context->malloced_stack + CONTEXT_STACK_SIZE);
+               context->malloced_stack + smx_context_stack_size);
 #endif                          /* HAVE_VALGRIND_VALGRIND_H */
 
      }else{
@@ -243,51 +257,133 @@ static void smx_ctx_raw_wrapper(smx_ctx_raw_t context)
   smx_ctx_raw_stop((smx_context_t) context);
 }
 
-static void smx_ctx_raw_resume(smx_context_t context)
+static void smx_ctx_raw_resume(smx_process_t process)
 {
-  smx_current_context = context; 
+  smx_ctx_raw_t context = (smx_ctx_raw_t)process->context;
+  smx_current_context = (smx_context_t)context;
   raw_swapcontext(
       &((smx_ctx_raw_t) context)->old_stack_top,
       ((smx_ctx_raw_t) context)->stack_top);
 }
 
-static void smx_ctx_raw_runall(xbt_dynar_t processes)
+#ifdef TIME_BENCH
+static void smx_ctx_raw_runall_serial(xbt_dynar_t processes)
 {
   smx_process_t process;
   unsigned int cursor;
 
+  double elapsed = 0;
+  double tmax = 0;
+  unsigned long num_proc = xbt_dynar_length(processes);
+  unsigned int t=0;
+  unsigned int data_size = (num_proc / NUM_THREADS) + ((num_proc % NUM_THREADS) ? 1 : 0);
+
+  ssr_count++;
+  time_thread_ssr[0] = 0;
   xbt_dynar_foreach(processes, cursor, process) {
-    DEBUG2("Schedule item %u of %lu",cursor,xbt_dynar_length(processes));
-    smx_ctx_raw_resume(process->context);
+    XBT_DEBUG("Schedule item %u of %lu",cursor,xbt_dynar_length(processes));
+    if(cursor >= t * data_size + data_size){
+      if(time_thread_ssr[t] > tmax)
+        tmax = time_thread_ssr[t];
+      t++;
+      time_thread_ssr[t] = 0;
+    }
+
+    if(new_sr){
+      ((smx_ctx_raw_t)process->context)->thread = t;
+      time_thread_sr[t] = 0;
+    }
+
+    xbt_os_timer_start(timer);
+    smx_ctx_raw_resume(process);
+    xbt_os_timer_stop(timer);
+    elapsed = xbt_os_timer_elapsed(timer);
+    time_thread_ssr[t] += elapsed;
+    time_thread_sr[((smx_ctx_raw_t)process->context)->thread] += elapsed;
+  }
+
+  if(new_sr)
+    new_sr = FALSE;
+
+  if(time_thread_ssr[t] > tmax)
+    tmax = time_thread_ssr[t];
+
+  for(cursor=0; cursor <= t; cursor++){
+    XBT_VERB("Time SSR thread %u = %lf (max %lf)", cursor, time_thread_ssr[cursor], tmax);
+    time_wasted_ssr += tmax - time_thread_ssr[cursor];
   }
+
   xbt_dynar_reset(processes);
 }
 
-static void smx_ctx_raw_resume_parallel(smx_process_t process)
+void smx_ctx_raw_new_sr(void);
+void smx_ctx_raw_new_sr(void)
 {
-  smx_ctx_raw_t context = (smx_ctx_raw_t)process->context;
-  xbt_os_thread_set_extra_data(context);
-  raw_swapcontext(
-      &context->old_stack_top,
-      context->stack_top);
-  xbt_os_thread_set_extra_data(NULL);
+  int i;
+  double tmax = 0;
+  new_sr = TRUE;
+  sr_count++;
+  for(i=0; i < NUM_THREADS; i++){
+    if(time_thread_sr[i] > tmax)
+      tmax = time_thread_sr[i];
+  }
+
+  for(i=0; i < NUM_THREADS; i++){
+    XBT_VERB("Time SR thread %u = %lf (max %lf)", i, time_thread_sr[i], tmax);
+    time_wasted_sr += tmax - time_thread_sr[i];
+  }
+
+  XBT_VERB("New scheduling round");
+}
+#else
+static void smx_ctx_raw_runall_serial(xbt_dynar_t processes)
+{
+  smx_process_t process;
+  unsigned int cursor;
+
+  xbt_dynar_foreach(processes, cursor, process) {
+    XBT_DEBUG("Schedule item %u of %lu",cursor,xbt_dynar_length(processes));
+    smx_ctx_raw_resume(process);
+  }
+  xbt_dynar_reset(processes);
 }
+#endif
 
 static void smx_ctx_raw_runall_parallel(xbt_dynar_t processes)
 {
-  xbt_parmap_apply(parmap, (void_f_pvoid_t)smx_ctx_raw_resume_parallel, processes);
+#ifdef CONTEXT_THREADS
+  xbt_parmap_apply(parmap, (void_f_pvoid_t)smx_ctx_raw_resume, processes);
+#endif
   xbt_dynar_reset(processes);
 }
 
 static smx_context_t smx_ctx_raw_self_parallel(void)
 {
-  smx_context_t self_context = (smx_context_t) xbt_os_thread_get_extra_data();
-  return self_context ? self_context : (smx_context_t) maestro_raw_context;
+  return smx_current_context;
+}
+
+static int smx_ctx_raw_get_thread_id(){
+  return (int)(unsigned long)xbt_os_thread_get_extra_data();
+}
+
+static void smx_ctx_raw_runall(xbt_dynar_t processes)
+{
+  if (xbt_dynar_length(processes) >= SIMIX_context_get_parallel_threshold()) {
+    XBT_DEBUG("Runall // %lu", xbt_dynar_length(processes));
+    raw_factory->self = smx_ctx_raw_self_parallel;
+    raw_factory->get_thread_id = smx_ctx_raw_get_thread_id;
+    smx_ctx_raw_runall_parallel(processes);
+  } else {
+    XBT_DEBUG("Runall serial %lu", xbt_dynar_length(processes));
+    raw_factory->self = smx_ctx_base_self;
+    raw_factory->get_thread_id = smx_ctx_base_get_thread_id;
+    smx_ctx_raw_runall_serial(processes);
+  }
 }
 
 void SIMIX_ctx_raw_factory_init(smx_context_factory_t *factory)
 {
-  VERB0("Using raw contexts. Because the glibc is just not good enough for us.");
+  XBT_VERB("Using raw contexts. Because the glibc is just not good enough for us.");
   smx_ctx_base_factory_init(factory);
 
   (*factory)->finalize  = smx_ctx_raw_factory_finalize;
@@ -298,15 +394,29 @@ void SIMIX_ctx_raw_factory_init(smx_context_factory_t *factory)
   (*factory)->suspend = smx_ctx_raw_suspend;
   (*factory)->name = "smx_raw_context_factory";
 
-  if (smx_parallel_contexts) {
-#ifdef CONTEXT_THREADS  /* To use parallel ucontexts a thread pool is needed */
-    parmap = xbt_parmap_new(2);
-    (*factory)->runall = smx_ctx_raw_runall_parallel;
-    (*factory)->self = smx_ctx_raw_self_parallel;
-#else
-    THROW0(arg_error, 0, "No thread support for parallel context execution");
+  if (SIMIX_context_is_parallel()) {
+#ifdef CONTEXT_THREADS
+    parmap = xbt_parmap_new(SIMIX_context_get_nthreads());
 #endif
-  }else{
-    (*factory)->runall = smx_ctx_raw_runall;
+    if (SIMIX_context_get_parallel_threshold() > 1) {
+      /* choose dynamically */
+      (*factory)->runall = smx_ctx_raw_runall;
+    }
+    else {
+      /* always parallel */
+      (*factory)->self = smx_ctx_raw_self_parallel;
+      (*factory)->get_thread_id = smx_ctx_raw_get_thread_id;
+      (*factory)->runall = smx_ctx_raw_runall_parallel;
+    }
+  }
+  else {
+    /* always serial */
+    (*factory)->self = smx_ctx_base_self;
+    (*factory)->get_thread_id = smx_ctx_base_get_thread_id;
+    (*factory)->runall = smx_ctx_raw_runall_serial;
   }
+  raw_factory = *factory;
+#ifdef TIME_BENCH
+  timer = xbt_os_timer_new();
+#endif
 }