X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/7a8cd62135619ad52e05ae1c929ef07e166e4260..0e9c0448c6566825b170b98ecff716b098bda10e:/src/msg/msg_task.c

diff --git a/src/msg/msg_task.c b/src/msg/msg_task.c
index a32e0d81a5..aee793c7d1 100644
--- a/src/msg/msg_task.c
+++ b/src/msg/msg_task.c
@@ -1,10 +1,11 @@
-/* Copyright (c) 2004, 2005, 2006, 2007, 2008, 2009, 2010. The SimGrid Team.
+/* Copyright (c) 2004-2013. The SimGrid Team.
  * All rights reserved.                                                     */
 
 /* This program is free software; you can redistribute it and/or modify it
  * under the terms of the license (GNU LGPL) which comes with this package. */
 
 #include "msg_private.h"
+#include "simix/smx_private.h"
 #include "xbt/sysdep.h"
 #include "xbt/log.h"
 
@@ -62,6 +63,8 @@ msg_task_t MSG_task_create(const char *name, double compute_duration,
   simdata->receiver = NULL;
   simdata->source = NULL;
   simdata->priority = 1.0;
+  simdata->bound = 0;
+  simdata->affinity_mask_db = xbt_dict_new_homogeneous(NULL);
   simdata->rate = -1.0;
   simdata->isused = 0;
 
@@ -283,6 +286,8 @@ msg_error_t MSG_task_destroy(msg_task_t task)
   /* parallel tasks only */
   xbt_free(task->simdata->host_list);
 
+  xbt_dict_free(&task->simdata->affinity_mask_db);
+
   /* free main structures */
   xbt_free(task->simdata);
   xbt_free(task);
@@ -438,3 +443,111 @@ void MSG_task_set_priority(msg_task_t task, double priority)
     simcall_host_execution_set_priority(task->simdata->compute,
                                       task->simdata->priority);
 }
+
+
+/** \ingroup m_task_management
+ * \brief Changes the maximum CPU utilization of a computation task.
+ *        Unit is flops/s.
+ *
+ * For VMs, there is a pitfall. Please see MSG_vm_set_bound().
+ */
+void MSG_task_set_bound(msg_task_t task, double bound)
+{
+  xbt_assert(task, "Invalid parameter");
+  xbt_assert(task->simdata, "Invalid parameter");
+
+  if (bound == 0)
+    XBT_INFO("bound == 0 means no capping (i.e., unlimited).");
+
+  task->simdata->bound = bound;
+  if (task->simdata->compute)
+    simcall_host_execution_set_bound(task->simdata->compute,
+                                      task->simdata->bound);
+}
+
+
+/** \ingroup m_task_management
+ * \brief Changes the CPU affinity of a computation task.
+ *
+ * When pinning the given task to the first CPU core of the given host, use
+ * 0x01 for the mask value. Each bit of the mask value corresponds to each CPU
+ * core. See taskset(1) on Linux.
+ *
+ * \param task a target task
+ * \param host the host having a multi-core CPU
+ * \param mask the bit mask of a new CPU affinity setting for the task
+ *
+ *
+ * Usage:
+ * 0. Define a host with multiple cores.
+ *    <host id="PM0" power="1E8" core="2"/>
+ *
+ * 1. Pin a given task to the first CPU core of a host.
+ *   MSG_task_set_affinity(task, pm0, 0x01);
+ *
+ * 2. Pin a given task to the third CPU core of a host. Turn on the third bit of the mask.
+ *   MSG_task_set_affinity(task, pm0, 0x04); // 0x04 == 100B
+ *
+ * 3. Pin a given VM to the first CPU core of a host.
+ *   MSG_vm_set_affinity(vm, pm0, 0x01);
+ *
+ * See examples/msg/cloud/multicore.c for more information.
+ *
+ *
+ * Note:
+ * 1. The current code does not allow an affinity of a task to multiple cores.
+ * The mask value 0x03 (i.e., a given task will be executed on the first core
+ * or the second core) is not allowed. The mask value 0x01 or 0x02 works. See
+ * cpu_cas01.c for details.
+ *
+ * 2. It is recommended to first compare simulation results in both the Lazy
+ * and Full calculation modes (using --cfg=cpu/optim:Full or not). Fix
+ * cpu_cas01.c if you find wrong results in the Lazy mode.
+ *
+ */
+void MSG_task_set_affinity(msg_task_t task, msg_host_t host, unsigned long mask)
+{
+  xbt_assert(task, "Invalid parameter");
+  xbt_assert(task->simdata, "Invalid parameter");
+
+  if (mask == 0) {
+    /* 0 means clear */
+    {
+      /* We need remove_ext() not throwing exception. */
+      void *ret = xbt_dict_get_or_null_ext(task->simdata->affinity_mask_db, (char *) host, sizeof(msg_host_t));
+      if (ret != NULL)
+        xbt_dict_remove_ext(task->simdata->affinity_mask_db, (char *) host, sizeof(host));
+    }
+  } else
+    xbt_dict_set_ext(task->simdata->affinity_mask_db, (char *) host, sizeof(host), (void *) mask, NULL);
+
+  /* We set affinity data of this task. If the task is being executed, we
+   * actually change the affinity setting of the task. Otherwise, this change
+   * will be applied when the task is executed. */
+
+  if (!task->simdata->compute) {
+    /* task is not yet executed */
+    XBT_INFO("set affinity(0x%04lx@%s) for %s (not active now)", mask, MSG_host_get_name(host), MSG_task_get_name(task));
+    return;
+  }
+
+  {
+    smx_action_t compute = task->simdata->compute;
+    msg_host_t host_now = compute->execution.host;  // simix_private.h is necessary
+    if (host_now != host) {
+      /* task is not yet executed on this host */
+      XBT_INFO("set affinity(0x%04lx@%s) for %s (not active now)", mask, MSG_host_get_name(host), MSG_task_get_name(task));
+      return;
+    }
+
+    /* task is being executed on this host. so change the affinity now */
+    {
+      /* check it works. remove me if it works. */
+      unsigned long affinity_mask = (unsigned long) xbt_dict_get_or_null_ext(task->simdata->affinity_mask_db, (char *) host, sizeof(msg_host_t));
+      xbt_assert(affinity_mask == mask);
+    }
+
+    XBT_INFO("set affinity(0x%04lx@%s) for %s", mask, MSG_host_get_name(host), MSG_task_get_name(task));
+    simcall_host_execution_set_affinity(task->simdata->compute, host, mask);
+  }
+}