+
+
+/** \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_process_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 *)(uintptr_t) 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_synchro_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. */
+ xbt_assert((unsigned long)(uintptr_t) xbt_dict_get_or_null_ext(task->simdata->affinity_mask_db, (char *) host, sizeof(msg_host_t)) == mask);
+ }
+
+ XBT_INFO("set affinity(0x%04lx@%s) for %s", mask, MSG_host_get_name(host), MSG_task_get_name(task));
+ simcall_process_execution_set_affinity(task->simdata->compute, host, mask);
+ }
+}
