1 /* Copyright (c) 2004-2019. The SimGrid Team. All rights reserved. */
3 /* This program is free software; you can redistribute it and/or modify it
4 * under the terms of the license (GNU LGPL) which comes with this package. */
6 #include "msg_private.hpp"
7 #include "src/instr/instr_private.hpp"
8 #include <simgrid/s4u/Comm.hpp>
9 #include <simgrid/s4u/Exec.hpp>
10 #include <simgrid/s4u/Host.hpp>
11 #include <simgrid/s4u/Mailbox.hpp>
16 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(msg_task, msg, "Logging specific to MSG (task)");
21 Task::Task(std::string name, double flops_amount, double bytes_amount, void* data)
22 : name_(std::move(name)), userdata_(data), flops_amount(flops_amount), bytes_amount(bytes_amount)
24 static std::atomic_ullong counter{0};
27 MC_ignore_heap(&(id_), sizeof(id_));
30 Task::Task(std::string name, std::vector<s4u::Host*> hosts, std::vector<double> flops_amount,
31 std::vector<double> bytes_amount, void* data)
32 : Task(std::move(name), 1.0, 0, data)
35 hosts_ = std::move(hosts);
36 flops_parallel_amount = std::move(flops_amount);
37 bytes_parallel_amount = std::move(bytes_amount);
40 Task* Task::create(std::string name, double flops_amount, double bytes_amount, void* data)
42 return new Task(std::move(name), flops_amount, bytes_amount, data);
45 Task* Task::create_parallel(std::string name, int host_nb, const msg_host_t* host_list, double* flops_amount,
46 double* bytes_amount, void* data)
48 std::vector<s4u::Host*> hosts;
49 std::vector<double> flops;
50 std::vector<double> bytes;
52 for (int i = 0; i < host_nb; i++) {
53 hosts.push_back(host_list[i]);
54 if (flops_amount != nullptr)
55 flops.push_back(flops_amount[i]);
56 if (bytes_amount != nullptr) {
57 for (int j = 0; j < host_nb; j++)
58 bytes.push_back(bytes_amount[host_nb * i + j]);
61 return new Task(std::move(name), std::move(hosts), std::move(flops), std::move(bytes), data);
64 msg_error_t Task::execute()
66 /* checking for infinite values */
67 xbt_assert(std::isfinite(flops_amount), "flops_amount is not finite!");
69 msg_error_t status = MSG_OK;
70 if (flops_amount <= 0.0)
76 compute = s4u::this_actor::exec_init(hosts_, flops_parallel_amount, bytes_parallel_amount);
78 compute = s4u::this_actor::exec_init(flops_amount);
80 compute->set_name(name_)
81 ->set_tracing_category(tracing_category_)
82 ->set_timeout(timeout_)
83 ->set_priority(1 / priority_)
88 XBT_DEBUG("Execution task '%s' finished", get_cname());
89 } catch (HostFailureException& e) {
90 status = MSG_HOST_FAILURE;
91 } catch (TimeoutError& e) {
93 } catch (CancelException& e) {
94 status = MSG_TASK_CANCELED;
97 /* action ended, set comm and compute = nullptr, the actions is already destroyed in the main function */
105 s4u::CommPtr Task::send_async(std::string alias, void_f_pvoid_t cleanup, bool detached)
107 if (TRACE_actor_is_enabled()) {
108 container_t process_container = simgrid::instr::Container::by_name(instr_pid(MSG_process_self()));
109 std::string key = std::string("p") + std::to_string(get_id());
110 simgrid::instr::Container::get_root()->get_link("ACTOR_TASK_LINK")->start_event(process_container, "SR", key);
113 /* Prepare the task to send */
115 this->comm = nullptr;
116 msg_global->sent_msg++;
118 s4u::CommPtr comm = s4u::Mailbox::by_name(alias)->put_init(this, bytes_amount)->set_rate(get_rate());
122 comm->detach(cleanup);
126 if (TRACE_is_enabled() && has_tracing_category())
127 simgrid::simix::simcall([comm, this] { comm->get_impl()->set_category(std::move(tracing_category_)); });
132 msg_error_t Task::send(std::string alias, double timeout)
134 msg_error_t ret = MSG_OK;
137 s4u::CommPtr s4u_comm = send_async(alias, nullptr, false);
139 comm->wait_for(timeout);
140 } catch (simgrid::TimeoutError& e) {
142 } catch (simgrid::CancelException& e) {
143 ret = MSG_HOST_FAILURE;
144 } catch (xbt_ex& e) {
145 if (e.category == network_error)
146 ret = MSG_TRANSFER_FAILURE;
150 /* If the send failed, it is not used anymore */
166 void Task::set_priority(double priority)
168 xbt_assert(std::isfinite(1.0 / priority), "priority is not finite!");
169 priority_ = 1.0 / priority;
172 s4u::Actor* Task::get_sender()
174 return comm ? comm->get_sender().get() : nullptr;
177 s4u::Host* Task::get_source()
179 return comm ? comm->get_sender()->get_host() : nullptr;
182 void Task::set_used()
185 report_multiple_use();
189 void Task::report_multiple_use() const
191 if (msg_global->debug_multiple_use){
192 XBT_ERROR("This task is already used in there:");
194 XBT_ERROR("<missing backtrace>");
195 XBT_ERROR("And you try to reuse it from here:");
196 xbt_backtrace_display_current();
198 xbt_die("This task is still being used somewhere else. You cannot send it now. Go fix your code!"
199 "(use --cfg=msg/debug-multiple-use:on to get the backtrace of the other process)");
203 } // namespace simgrid
205 /********************************* Task **************************************/
206 /** @brief Creates a new task
208 * A constructor for msg_task_t taking four arguments.
210 * @param name a name for the object. It is for user-level information and can be nullptr.
211 * @param flop_amount a value of the processing amount (in flop) needed to process this new task.
212 * If 0, then it cannot be executed with MSG_task_execute(). This value has to be >=0.
213 * @param message_size a value of the amount of data (in bytes) needed to transfer this new task. If 0, then it cannot
214 * be transfered with MSG_task_send() and MSG_task_recv(). This value has to be >=0.
215 * @param data a pointer to any data may want to attach to the new object. It is for user-level information and can
216 * be nullptr. It can be retrieved with the function @ref MSG_task_get_data.
217 * @return The new corresponding object.
219 msg_task_t MSG_task_create(const char *name, double flop_amount, double message_size, void *data)
221 return simgrid::msg::Task::create(name ? std::string(name) : "", flop_amount, message_size, data);
224 /** @brief Creates a new parallel task
226 * A constructor for #msg_task_t taking six arguments.
229 * See :cpp:func:`void simgrid::s4u::this_actor::parallel_execute(int, s4u::Host**, double*, double*)` for
230 * the exact semantic of the parameters.
233 * @param name a name for the object. It is for user-level information and can be nullptr.
234 * @param host_nb the number of hosts implied in the parallel task.
235 * @param host_list an array of @p host_nb msg_host_t.
236 * @param flops_amount an array of @p host_nb doubles.
237 * flops_amount[i] is the total number of operations that have to be performed on host_list[i].
238 * @param bytes_amount an array of @p host_nb* @p host_nb doubles.
239 * @param data a pointer to any data may want to attach to the new object.
240 * It is for user-level information and can be nullptr.
241 * It can be retrieved with the function @ref MSG_task_get_data().
243 msg_task_t MSG_parallel_task_create(const char *name, int host_nb, const msg_host_t * host_list,
244 double *flops_amount, double *bytes_amount, void *data)
246 // Task's flops amount is set to an arbitrary value > 0.0 to be able to distinguish, in
247 // MSG_task_get_remaining_work_ratio(), a finished task and a task that has not started yet.
248 return simgrid::msg::Task::create_parallel(name ? name : "", host_nb, host_list, flops_amount, bytes_amount, data);
251 /** @brief Return the user data of the given task */
252 void* MSG_task_get_data(msg_task_t task)
254 return task->get_user_data();
257 /** @brief Sets the user data of a given task */
258 void MSG_task_set_data(msg_task_t task, void *data)
260 task->set_user_data(data);
263 /** @brief Sets a function to be called when a task has just been copied.
264 * @param callback a callback function
266 void MSG_task_set_copy_callback(void (*callback) (msg_task_t task, msg_process_t sender, msg_process_t receiver)) {
268 msg_global->task_copy_callback = callback;
271 SIMIX_comm_set_copy_data_callback(MSG_comm_copy_data_from_SIMIX);
273 SIMIX_comm_set_copy_data_callback(SIMIX_comm_copy_pointer_callback);
277 /** @brief Returns the sender of the given task */
278 msg_process_t MSG_task_get_sender(msg_task_t task)
280 return task->get_sender();
283 /** @brief Returns the source (the sender's host) of the given task */
284 msg_host_t MSG_task_get_source(msg_task_t task)
286 return task->get_source();
289 /** @brief Returns the name of the given task. */
290 const char *MSG_task_get_name(msg_task_t task)
292 return task->get_cname();
295 /** @brief Sets the name of the given task. */
296 void MSG_task_set_name(msg_task_t task, const char *name)
298 task->set_name(name);
302 * @brief Executes a task and waits for its termination.
304 * This function is used for describing the behavior of a process. It takes only one parameter.
305 * @param task a #msg_task_t to execute on the location on which the process is running.
306 * @return #MSG_OK if the task was successfully completed, #MSG_TASK_CANCELED or #MSG_HOST_FAILURE otherwise
308 msg_error_t MSG_task_execute(msg_task_t task)
310 return task->execute();
314 * @brief Executes a parallel task and waits for its termination.
316 * @param task a #msg_task_t to execute on the location on which the process is running.
318 * @return #MSG_OK if the task was successfully completed, #MSG_TASK_CANCELED or #MSG_HOST_FAILURE otherwise
320 msg_error_t MSG_parallel_task_execute(msg_task_t task)
322 return task->execute();
325 msg_error_t MSG_parallel_task_execute_with_timeout(msg_task_t task, double timeout)
327 task->set_timeout(timeout);
328 return task->execute();
332 * @brief Sends a task on a mailbox.
334 * This is a non blocking function: use MSG_comm_wait() or MSG_comm_test() to end the communication.
336 * @param task a #msg_task_t to send on another location.
337 * @param alias name of the mailbox to sent the task to
338 * @return the msg_comm_t communication created
340 msg_comm_t MSG_task_isend(msg_task_t task, const char* alias)
342 return new simgrid::msg::Comm(task, nullptr, task->send_async(alias, nullptr, false));
346 * @brief Sends a task on a mailbox with a maximum rate
348 * This is a non blocking function: use MSG_comm_wait() or MSG_comm_test() to end the communication. The maxrate
349 * parameter allows the application to limit the bandwidth utilization of network links when sending the task.
351 * @param task a #msg_task_t to send on another location.
352 * @param alias name of the mailbox to sent the task to
353 * @param maxrate the maximum communication rate for sending this task (byte/sec).
354 * @return the msg_comm_t communication created
356 msg_comm_t MSG_task_isend_bounded(msg_task_t task, const char* alias, double maxrate)
358 task->set_rate(maxrate);
359 return new simgrid::msg::Comm(task, nullptr, task->send_async(alias, nullptr, false));
363 * @brief Sends a task on a mailbox.
365 * This is a non blocking detached send function.
366 * Think of it as a best effort send. Keep in mind that the third parameter is only called if the communication fails.
367 * If the communication does work, it is responsibility of the receiver code to free anything related to the task, as
368 * usual. More details on this can be obtained on
369 * <a href="http://lists.gforge.inria.fr/pipermail/simgrid-user/2011-November/002649.html">this thread</a>
370 * in the SimGrid-user mailing list archive.
372 * @param task a #msg_task_t to send on another location.
373 * @param alias name of the mailbox to sent the task to
374 * @param cleanup a function to destroy the task if the communication fails, e.g. MSG_task_destroy
375 * (if nullptr, no function will be called)
377 void MSG_task_dsend(msg_task_t task, const char* alias, void_f_pvoid_t cleanup)
379 task->send_async(alias, cleanup, true);
383 * @brief Sends a task on a mailbox with a maximal rate.
385 * This is a non blocking detached send function.
386 * Think of it as a best effort send. Keep in mind that the third parameter is only called if the communication fails.
387 * If the communication does work, it is responsibility of the receiver code to free anything related to the task, as
388 * usual. More details on this can be obtained on
389 * <a href="http://lists.gforge.inria.fr/pipermail/simgrid-user/2011-November/002649.html">this thread</a>
390 * in the SimGrid-user mailing list archive.
392 * The rate parameter can be used to send a task with a limited bandwidth (smaller than the physical available value).
393 * Use MSG_task_dsend() if you don't limit the rate (or pass -1 as a rate value do disable this feature).
395 * @param task a #msg_task_t to send on another location.
396 * @param alias name of the mailbox to sent the task to
397 * @param cleanup a function to destroy the task if the communication fails, e.g. MSG_task_destroy (if nullptr, no
398 * function will be called)
399 * @param maxrate the maximum communication rate for sending this task (byte/sec)
402 void MSG_task_dsend_bounded(msg_task_t task, const char* alias, void_f_pvoid_t cleanup, double maxrate)
404 task->set_rate(maxrate);
405 task->send_async(alias, cleanup, true);
408 * @brief Sends a task to a mailbox
410 * This is a blocking function, the execution flow will be blocked until the task is sent (and received on the other
411 * side if #MSG_task_receive is used).
412 * See #MSG_task_isend for sending tasks asynchronously.
414 * @param task the task to be sent
415 * @param alias the mailbox name to where the task is sent
417 * @return Returns #MSG_OK if the task was successfully sent,
418 * #MSG_HOST_FAILURE, or #MSG_TRANSFER_FAILURE otherwise.
420 msg_error_t MSG_task_send(msg_task_t task, const char* alias)
422 XBT_DEBUG("MSG_task_send: Trying to send a message on mailbox '%s'", alias);
423 return task->send(alias, -1);
427 * @brief Sends a task to a mailbox with a maximum rate
429 * This is a blocking function, the execution flow will be blocked until the task is sent. The maxrate parameter allows
430 * the application to limit the bandwidth utilization of network links when sending the task.
432 * The maxrate parameter can be used to send a task with a limited bandwidth (smaller than the physical available
433 * value). Use MSG_task_send() if you don't limit the rate (or pass -1 as a rate value do disable this feature).
435 * @param task the task to be sent
436 * @param alias the mailbox name to where the task is sent
437 * @param maxrate the maximum communication rate for sending this task (byte/sec)
439 * @return Returns #MSG_OK if the task was successfully sent,
440 * #MSG_HOST_FAILURE, or #MSG_TRANSFER_FAILURE otherwise.
442 msg_error_t MSG_task_send_bounded(msg_task_t task, const char* alias, double maxrate)
444 task->set_rate(maxrate);
445 return task->send(alias, -1);
449 * @brief Sends a task to a mailbox with a timeout
451 * This is a blocking function, the execution flow will be blocked until the task is sent or the timeout is achieved.
453 * @param task the task to be sent
454 * @param alias the mailbox name to where the task is sent
455 * @param timeout is the maximum wait time for completion (if -1, this call is the same as #MSG_task_send)
457 * @return Returns #MSG_OK if the task was successfully sent,
458 * #MSG_HOST_FAILURE, or #MSG_TRANSFER_FAILURE, or #MSG_TIMEOUT otherwise.
460 msg_error_t MSG_task_send_with_timeout(msg_task_t task, const char* alias, double timeout)
462 return task->send(alias, timeout);
466 * @brief Sends a task to a mailbox with a timeout and with a maximum rate
468 * This is a blocking function, the execution flow will be blocked until the task is sent or the timeout is achieved.
470 * The maxrate parameter can be used to send a task with a limited bandwidth (smaller than the physical available
471 * value). Use MSG_task_send_with_timeout() if you don't limit the rate (or pass -1 as a rate value do disable this
474 * @param task the task to be sent
475 * @param alias the mailbox name to where the task is sent
476 * @param timeout is the maximum wait time for completion (if -1, this call is the same as #MSG_task_send)
477 * @param maxrate the maximum communication rate for sending this task (byte/sec)
479 * @return Returns #MSG_OK if the task was successfully sent,
480 * #MSG_HOST_FAILURE, or #MSG_TRANSFER_FAILURE, or #MSG_TIMEOUT otherwise.
482 msg_error_t MSG_task_send_with_timeout_bounded(msg_task_t task, const char* alias, double timeout, double maxrate)
484 task->set_rate(maxrate);
485 return task->send(alias, timeout);
488 /** @brief Destroys the given task.
490 * You should free user data, if any, @b before calling this destructor.
492 * Only the process that owns the task can destroy it.
493 * The owner changes after a successful send.
494 * If a task is successfully sent, the receiver becomes the owner and is supposed to destroy it. The sender should not
496 * If the task failed to be sent, the sender remains the owner of the task.
498 msg_error_t MSG_task_destroy(msg_task_t task)
500 if (task->is_used()) {
501 /* the task is being sent or executed: cancel it first */
505 /* free main structures */
511 /** @brief Cancel the given task
513 * If it was currently executed or transfered, the working process is stopped.
515 msg_error_t MSG_task_cancel(msg_task_t task)
517 xbt_assert((task != nullptr), "Cannot cancel a nullptr task");
522 /** @brief Returns a value in ]0,1[ that represent the task remaining work
523 * to do: starts at 1 and goes to 0. Returns 0 if not started or finished.
525 * It works for either parallel or sequential tasks.
527 double MSG_task_get_remaining_work_ratio(msg_task_t task) {
529 xbt_assert((task != nullptr), "Cannot get information from a nullptr task");
532 return task->compute->get_remaining_ratio();
534 // Task not started (flops_amount is > 0.0) or finished (flops_amount is set to 0.0)
535 return task->flops_amount > 0.0 ? 1.0 : 0.0;
539 /** @brief Returns the amount of flops that remain to be computed
541 * The returned value is initially the cost that you defined for the task, then it decreases until it reaches 0
543 * It works for sequential tasks, but the remaining amount of work is not a scalar value for parallel tasks.
544 * So you will get an exception if you call this function on parallel tasks. Just don't do it.
546 double MSG_task_get_flops_amount(msg_task_t task) {
547 if (task->compute != nullptr) {
548 return task->compute->get_remaining();
550 // Not started or already done.
551 // - Before starting, flops_amount is initially the task cost
552 // - After execution, flops_amount is set to 0 (until someone uses MSG_task_set_flops_amount, if any)
553 return task->flops_amount;
557 /** @brief set the computation amount needed to process the given task.
559 * @warning If the computation is ongoing (already started and not finished),
560 * it is not modified by this call. Moreover, after its completion, the ongoing execution with set the flops_amount to
561 * zero, overriding any value set during the execution.
563 void MSG_task_set_flops_amount(msg_task_t task, double flops_amount)
565 task->flops_amount = flops_amount;
568 /** @brief set the amount data attached with the given task.
570 * @warning If the transfer is ongoing (already started and not finished), it is not modified by this call.
572 void MSG_task_set_bytes_amount(msg_task_t task, double data_size)
574 task->bytes_amount = data_size;
577 /** @brief Returns the total amount received by the given task
579 * If the communication does not exist it will return 0.
580 * So, if the communication has FINISHED or FAILED it returns zero.
582 double MSG_task_get_remaining_communication(msg_task_t task)
584 XBT_DEBUG("calling simcall_communication_get_remains(%p)", task->comm.get());
585 return task->comm->get_remaining();
588 /** @brief Returns the size of the data attached to the given task. */
589 double MSG_task_get_bytes_amount(msg_task_t task)
591 xbt_assert(task != nullptr, "Invalid parameter");
592 return task->bytes_amount;
595 /** @brief Changes the priority of a computation task.
597 * This priority doesn't affect the transfer rate. A priority of 2
598 * will make a task receive two times more cpu power than regular tasks.
600 void MSG_task_set_priority(msg_task_t task, double priority)
602 task->set_priority(priority);
605 /** @brief Changes the maximum CPU utilization of a computation task (in flops/s).
607 * For VMs, there is a pitfall. Please see MSG_vm_set_bound().
609 void MSG_task_set_bound(msg_task_t task, double bound)
611 if (bound < 1e-12) /* close enough to 0 without any floating precision surprise */
612 XBT_INFO("bound == 0 means no capping (i.e., unlimited).");
613 task->set_bound(bound);
617 * @brief Sets the tracing category of a task.
619 * This function should be called after the creation of a MSG task, to define the category of that task. The
620 * first parameter task must contain a task that was =created with the function #MSG_task_create. The second
621 * parameter category must contain a category that was previously declared with the function #TRACE_category
622 * (or with #TRACE_category_with_color).
624 * See @ref outcomes_vizu for details on how to trace the (categorized) resource utilization.
626 * @param task the task that is going to be categorized
627 * @param category the name of the category to be associated to the task
629 * @see MSG_task_get_category, TRACE_category, TRACE_category_with_color
631 void MSG_task_set_category(msg_task_t task, const char* category)
633 xbt_assert(not task->has_tracing_category(), "Task %p(%s) already has a category (%s).", task, task->get_cname(),
634 task->get_tracing_category().c_str());
636 // if user provides a nullptr category, task is no longer traced
637 if (category == nullptr) {
638 task->set_tracing_category("");
639 XBT_DEBUG("MSG task %p(%s), category removed", task, task->get_cname());
642 task->set_tracing_category(category);
643 XBT_DEBUG("MSG task %p(%s), category %s", task, task->get_cname(), task->get_tracing_category().c_str());
648 * @brief Gets the current tracing category of a task. (@see MSG_task_set_category)
649 * @param task the task to be considered
650 * @return Returns the name of the tracing category of the given task, "" otherwise
652 const char* MSG_task_get_category(msg_task_t task)
654 return task->get_tracing_category().c_str();