/usr/include/madness/world/thread.h is in libmadness-dev 0.10.1~gite4aa500e-10.
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This file is part of MADNESS.
Copyright (C) 2007,2010 Oak Ridge National Laboratory
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
For more information please contact:
Robert J. Harrison
Oak Ridge National Laboratory
One Bethel Valley Road
P.O. Box 2008, MS-6367
email: harrisonrj@ornl.gov
tel: 865-241-3937
fax: 865-572-0680
*/
#ifndef MADNESS_WORLD_THREAD_H__INCLUDED
#define MADNESS_WORLD_THREAD_H__INCLUDED
/**
\file thread.h
\brief Implements Dqueue, Thread, ThreadBase and ThreadPool.
\ingroup threads
*/
#include <madness/world/dqueue.h>
#include <madness/world/function_traits.h>
#include <vector>
#include <cstddef>
#include <cstdio>
#include <pthread.h>
#include <type_traits>
#include <typeinfo>
#include <new>
//////////// Parsec Related Begin ////////////////////
#ifdef HAVE_PARSEC
#include <dague/dague_internal.h>
#include <dague_config.h>
#include "parsec.h"
#endif
//////////// Parsec Related End ////////////////////
#ifdef MADNESS_TASK_PROFILING
#include <execinfo.h> // for backtrace_symbols
#ifndef USE_LIBIBERTY
#include <cxxabi.h> // for abi::__cxa_demangle
#else
extern "C" {
extern char * cplus_demangle (const char *mangled, int options);
#define DMGL_NO_OPTS 0 /* For readability... */
}
#endif
#include <sstream> // for std::istringstream
#include <cstring> // for strchr & strrchr
#endif // MADNESS_TASK_PROFILING
#ifdef HAVE_INTEL_TBB
#include "tbb/tbb.h"
#endif
#ifndef _SC_NPROCESSORS_CONF
// Old macs don't have necessary support thru sysconf to determine the
// no. of processors so must use sysctl
#include <sys/types.h>
#include <sys/sysctl.h>
#endif
namespace madness {
// Forward decls.
class Barrier;
class ThreadPool;
class WorldTaskQueue;
class AtomicInt;
void error(const char *msg);
/// \addtogroup threads
/// @{
/// Simplified thread wrapper to hide pthread complexity.
/// If the thread is using any of the object state, you cannot
/// delete the object until the thread has terminated.
///
/// The cleanest solution is to put the object on the heap and
/// have the run method `delete this` at its end.
class ThreadBase {
friend class ThreadPool;
static bool bind[3]; ///< \todo Brief description needed.
static int cpulo[3]; ///< \todo Brief description needed.
static int cpuhi[3]; ///< \todo Brief description needed.
static pthread_key_t thread_key; ///< Thread id key.
/// \todo Brief description needed.
/// \todo Descriptions needed.
/// \param[in,out] self Description needed.
/// \return Description needed.
static void* main(void* self);
int pool_num; ///< Stores index of thread in pool or -1.
pthread_t id; ///< \todo Brief description needed.
/// \todo Brief description needed.
static void init_thread_key() {
const int rc = pthread_key_create(&thread_key, nullptr);
if(rc != 0)
MADNESS_EXCEPTION("pthread_key_create failed", rc);
}
/// \todo Brief description needed.
static void delete_thread_key() {
pthread_key_delete(thread_key);
}
/// Sets the index of this thread within the pool.
/// \todo Verify documentation.
/// \param[in] i The index of this thread.
void set_pool_thread_index(int i) {
pool_num = i;
}
#if defined(HAVE_IBMBGQ) and defined(HPM)
static const int hpm_thread_id_all = -10; ///< \todo Brief description needed.
static const int hpm_thread_id_main = -2; ///< \todo Brief description needed.
static bool main_instrumented; ///< \todo Brief description needed.
static bool all_instrumented; ///< \todo Brief description needed.
static int hpm_thread_id; ///< \todo Brief description needed.
#endif
public:
/// Default constructor.
/// Sets up the thread; however, \c start() must be invoked to
/// actually begin the thread.
ThreadBase() : pool_num(-1) { }
virtual ~ThreadBase() { }
/// Function to be executed by the thread.
/// Override this to do work.
virtual void run() = 0;
/// Start the thread running.
void start();
/// A thread can call this to terminate its execution.
static void exit() {
pthread_exit(0);
}
/// Get the pthread id of this thread (if running).
const pthread_t& get_id() const {
return id;
}
/// Get index of this thread in \c ThreadPool.
/// \return (0,...,nthread-1) or -1 if not in the \c ThreadPool.
int get_pool_thread_index() const {
return pool_num;
}
/// Cancel this thread.
int cancel() const {
return pthread_cancel(get_id());
}
/// Get number of actual hardware processors.
/// \return The number of hardward processors.
static int num_hw_processors();
/// Specify the affinity pattern or how to bind threads to CPUs.
/// \todo Descriptions needed.
/// \param[in] bind Description needed.
/// \param[in] cpu Description needed.
static void set_affinity_pattern(const bool bind[3], const int cpu[3]);
/// \todo Brief description needed.
/// \todo Descriptions needed.
/// \param[in] logical_id Description needed.
/// \param[in] ind Description needed.
static void set_affinity(int logical_id, int ind=-1);
/// \todo Brief description needed.
/// \todo Descriptions needed.
/// \return Description needed.
static ThreadBase* this_thread() {
return static_cast<ThreadBase*>(pthread_getspecific(thread_key));
}
#if defined(HAVE_IBMBGQ) and defined(HPM)
/// \todo Brief description needed.
/// \todo Descriptions needed.
/// \param[in] hpm_thread_id Description needed.
static void set_hpm_thread_env(int hpm_thread_id);
#endif
}; // class ThreadBase
/// Simplified thread wrapper to hide pthread complexity.
class Thread : public ThreadBase {
void* (*f)(void *); ///< The function called for executing this thread. \todo should we replace this by a std::function?
void* args; ///< The arguments passed to this thread for execution.
/// Invokes the function for this thread.
void run() {
f(args);
}
public:
/// Default constructor.
/// \c start() must be invoked to actually execute the thread.
Thread() : f(nullptr), args(nullptr) { }
/// Create a thread and start it running `f(args)`.
/// \param[in] f The function to be called.
/// \param[in,out] args The arguments to the function.
Thread(void* (*f)(void *), void* args=nullptr)
: f(f), args(args) {
ThreadBase::start();
}
/// Start the thread by running `f(args)`.
/// \param[in] f The function to be called.
/// \param[in,out] args The arguments to the function.
void start(void* (*f)(void *), void* args=nullptr) {
this->f = f;
this->args = args;
ThreadBase::start();
}
virtual ~Thread() = default;
}; // class Thread
/// Contains attributes of a task.
/// The current attributes are:
/// - \c generator : Setting this hints that a task will produce
/// additional tasks and is used by the scheduler to
/// increase/throttle parallelism. The default is false.
/// - \c stealable : Setting this indicates that a task may be
/// migrated to another process for dynamic load balancing. The
/// default value is false.
/// - \c highpriority : indicates a high priority task. The default
/// value is false.
/// - \c nthread : indicates number of threads. 0 threads is interpreted
/// as 1 thread for backward compatibility and ease of specifying
/// defaults. The default value is 0 (==1).
class TaskAttributes {
unsigned long flags; ///< Byte-string storing the specified attributes.
public:
static const unsigned long NTHREAD = 0xff; ///< Mask for nthread byte.
static const unsigned long GENERATOR = 1ul<<8; ///< Mask for generator bit.
static const unsigned long STEALABLE = GENERATOR<<1; ///< Mask for stealable bit.
static const unsigned long HIGHPRIORITY = GENERATOR<<2; ///< Mask for priority bit.
/// Sets the attributes to the desired values.
/// `flags`, if unspecified sets all attributes to their default
/// values.
/// \param[in] flags The attribute values.
explicit TaskAttributes(unsigned long flags = 0)
: flags(flags) {}
/// Copy constructor.
/// \param[in] attr The attributes to copy.
TaskAttributes(const TaskAttributes& attr)
: flags(attr.flags) {}
virtual ~TaskAttributes() {}
/// Test if the generator attribute is true.
/// \return True if this task is a generator, false otherwise.
bool is_generator() const {
return flags&GENERATOR;
}
/// Test if the stealable attribute is true.
/// \return True if this task is stealable, false otherwise.
bool is_stealable() const {
return flags&STEALABLE;
}
/// Test if the high priority attribute is true.
/// \return True if this task is a high priority, false otherwise.
bool is_high_priority() const {
return flags&HIGHPRIORITY;
}
/// Sets the generator attribute.
/// \param[in] generator_hint The new value for the generator attribute.
void set_generator(bool generator_hint) {
if (generator_hint)
flags |= GENERATOR;
else
flags &= ~GENERATOR;
}
/// Sets the stealable attribute.
/// \param[in] stealable The new value for the stealable attribute.
void set_stealable(bool stealable) {
if (stealable) flags |= STEALABLE;
else flags &= ~STEALABLE;
}
/// Sets the high priority attribute.
/// \param[in] hipri The new value for the high priority attribute.
void set_highpriority(bool hipri) {
if (hipri)
flags |= HIGHPRIORITY;
else
flags &= ~HIGHPRIORITY;
}
/// Set the number of threads.
/// \attention Are you sure this is what you want to call? Only call
/// this for a \c TaskAttributes that is \em not a base class of a task
/// object.
/// \p If you are trying to set the number of threads in an \em existing
/// task you should call \c TaskInterface::set_nthread() instead. No
/// doubt there is some virtual/protected/something voodoo to prevent
/// you from doing harm.
///
/// \todo Perhaps investigate a way to make this function only accessible
/// from the intended functions (using the so-called voodoo)?
///
/// \param[in] nthread The new number of threads.
void set_nthread(int nthread) {
MADNESS_ASSERT(nthread>=0 && nthread<256);
flags = (flags & (~NTHREAD)) | (nthread & NTHREAD);
}
/// Get the number of threads.
/// \return The number of threads.
int get_nthread() const {
int n = flags & NTHREAD;
if (n == 0)
n = 1;
return n;
}
/// Serializes the attributes for I/O.
/// tparam Archive The archive type.
/// \param[in,out] ar The archive.
template <typename Archive>
void serialize(Archive& ar) {
ar & flags;
}
/// \todo Brief description needed.
/// \todo Descriptions needed.
/// \return Description needed.
static TaskAttributes generator() {
return TaskAttributes(GENERATOR);
}
/// \todo Brief description needed.
/// \todo Descriptions needed.
/// \return Description needed.
static TaskAttributes hipri() {
return TaskAttributes(HIGHPRIORITY);
}
/// \todo Brief description needed.
/// \todo Descriptions needed.
/// \return Description needed.
static TaskAttributes multi_threaded(int nthread) {
TaskAttributes t;
t.set_nthread(nthread);
return t;
}
};
/// Used to pass information about the thread environment to a user's task.
class TaskThreadEnv {
const int _nthread; ///< Number of threads collaborating on task.
const int _id; ///< ID of this thread (0,...,nthread-1).
Barrier* _barrier; ///< Pointer to the shared barrier, `null` if there is only a single thread.
public:
/// Constructor collecting necessary environmental information.
/// \todo Verify this documentation.
/// \param[in] nthread The number of threads collaborating on this task.
/// \param[in] id The ID of this thread.
/// \param[in] barrier Pointer to the shared barrier.
TaskThreadEnv(int nthread, int id, Barrier* barrier)
: _nthread(nthread), _id(id), _barrier(barrier)
{}
#if HAVE_INTEL_TBB
/// Constructor collecting necessary environmental information.
/// \todo Verify this documentation.
/// \param[in] nthread The number of threads collaborating on this task.
/// \param[in] id The ID of this thread.
///
/// \todo I cannot get the TaskThreadEnv to work with Barrier.
/// Need to figure out why.
TaskThreadEnv(int nthread, int id)
: _nthread(nthread), _id(id), _barrier(nullptr)
{};
#endif
/// Get the number of threads collaborating on this task.
/// \return The number of threads.
int nthread() const {
return _nthread;
}
/// Get the ID of this thread.
/// \return The ID of this thread.
int id() const {
return _id;
}
/// \todo Brief description needed.
/// \todo Descriptions needed.
/// \return Description needed.
bool barrier() const {
if (_nthread == 1)
return true;
else {
MADNESS_ASSERT(_barrier);
return _barrier->enter(_id);
}
}
};
#ifdef MADNESS_TASK_PROFILING
namespace profiling {
/// Task event class.
/// This class is used to record the task trace information, including
/// submit, start, and stop times, as well as identification information.
class TaskEvent {
private:
double times_[3]; ///< Task trace times: { submit, start, stop }.
std::pair<void*, unsigned short> id_; ///< Task identification information.
unsigned short threads_; ///< Number of threads used by the task.
/// Print demangled symbol name.
/// Add the demangled symbol name to \c os. If demangling fails,
/// the unmodified symbol name is used instead. If symbol is NULL,
/// "UNKNOWN" is used instead. A tab character is added after the
/// symbol name.
/// \param[in,out] os The output stream.
/// \param[in] symbol The symbol to add to the stream.
static void print_demangled(std::ostream& os, const char* symbol) {
// Get the demagled symbol name
if(symbol) {
int status = 0;
#ifndef USE_LIBIBERTY
const char* name = abi::__cxa_demangle(symbol, 0, 0, &status);
#else
char* name = cplus_demangle(symbol, DMGL_NO_OPTS);
#endif
// Append the demangled symbol name to the output stream
if(status == 0) {
os << name << "\t";
free((void*)name);
} else {
os << symbol << "\t";
}
} else {
os << "UNKNOWN\t";
}
}
/// Get name of the function pointer.
/// \return The mangled function name.
std::string get_name() const {
// Get the backtrace symbol for the function address,
// which contains the function name.
void* const * func_ptr = const_cast<void* const *>(& id_.first);
char** bt_sym = backtrace_symbols(func_ptr, 1);
// Extract the mangled function name from the backtrace
// symbol.
std::string mangled_name;
#ifdef ON_A_MAC
// Format of bt_sym is:
// <frame #> <file name> <address> <mangled name> + <function offset>
std::istringstream iss(bt_sym[0]);
long frame;
std::string file, address;
iss >> frame >> file >> address >> mangled_name;
#else // Assume Linux
// Format of bt_sym is:
// <file>(<mangled name>+<function offset>) [<address>]
const char* first = strchr(bt_sym[0],'(');
if(first) {
++first;
const char* last = strrchr(first,'+');
if(last)
mangled_name.assign(first, (last - first) - 1);
}
#endif // ON_A_MAC
// Free the backtrace buffer
free(bt_sym);
return mangled_name;
}
public:
// Only default constructors are needed.
/// Record the start time of the task and collect task information.
/// \param[in,out] id The task identifier (a function pointer or const char*)
/// and an integer to differentiate the different types.
/// \param[in] threads The number of threads this task uses.
/// \param[in] submit_time The time that the task was submitted to the
/// task queue.
void start(const std::pair<void*, unsigned short>& id,
const unsigned short threads, const double submit_time)
{
id_ = id;
threads_ = threads;
times_[0] = submit_time;
times_[1] = wall_time();
}
/// Record the stop time of the task.
void stop() {
times_[2] = wall_time();
}
/// Output the task data using a tab-separated list.
/// Output information includes
/// - the ID pointer
/// - the function, member function, and object type name
/// - the number of threads used by the task
/// - the submit time
/// - the start time
/// - the stop time.
///
/// \param[in,out] os The output stream.
/// \param[in] te The task event to be output.
/// \return The \c os reference.
friend std::ostream& operator<<(std::ostream& os, const TaskEvent& te) {
// Add address to output stream
os << std::hex << std::showbase << te.id_.first <<
std::dec << std::noshowbase << "\t";
// Print the name
switch(te.id_.second) {
case 1:
{
const std::string mangled_name = te.get_name();
// Print the demangled name
if(! mangled_name.empty())
print_demangled(os, mangled_name.c_str());
else
os << "UNKNOWN\t";
}
break;
case 2:
print_demangled(os, static_cast<const char*>(te.id_.first));
break;
default:
os << "UNKNOWN\t";
}
// Print:
// # of threads, submit time, start time, stop time
os << te.threads_;
const std::streamsize precision = os.precision();
os.precision(6);
os << std::fixed << "\t" << te.times_[0]
<< "\t" << te.times_[1] << "\t" << te.times_[2];
os.precision(precision);
return os;
}
}; // class TaskEvent
/// Task event list base class.
/// This base class allows the data to be stored in a linked list.
class TaskEventListBase {
private:
TaskEventListBase* next_; ///< The next task event in the list.
TaskEventListBase(const TaskEventListBase&) = delete;
TaskEventListBase& operator=(const TaskEventListBase&) = delete;
public:
/// Default constructor.
TaskEventListBase()
: next_(nullptr) { }
/// Virtual destructor.
virtual ~TaskEventListBase() = default;
/// Get the next event list in the linked list.
/// \return The next event list.
TaskEventListBase* next() const {
return next_;
}
/// Insert \c list after this list.
/// \param[in] list The list to be inserted.
void insert(TaskEventListBase* list) {
if(next_)
list->next_ = next_;
next_ = list;
}
/// Output a task event list to an output stream.
/// \param[in,out] os The ouptut stream.
/// \param[in] tel The task event list to be output.
/// \return The modified output stream.
friend inline std::ostream& operator<<(std::ostream& os, const TaskEventListBase& tel) {
return tel.print_events(os);
}
private:
/// Print the events.
virtual std::ostream& print_events(std::ostream&) const = 0;
}; // class TaskEventList
/// A list of task events.
/// This object is used by the thread pool to record task data.
class TaskEventList : public TaskEventListBase {
private:
unsigned int n_; ///< The number of events recorded.
std::unique_ptr<TaskEvent[]> events_; ///< The event array.
TaskEventList(const TaskEventList&) = delete;
TaskEventList& operator=(const TaskEventList&) = delete;
public:
/// Default constructor.
/// \param[in] nmax The maximum number of task events.
/// \todo Should nmax be stored? I think it used to be a template
/// parameter (N), which is no longer present.
TaskEventList(const unsigned int nmax) :
TaskEventListBase(), n_(0ul), events_(new TaskEvent[nmax])
{ }
/// Virtual destructor.
virtual ~TaskEventList() = default;
/// Get a new event from this list.
/// \warning This function can only be called \c nmax times. It is
/// the caller's resonsibility to ensure that it is not called too
/// many times.
/// \return The new event from the list.
TaskEvent* event() {
return events_.get() + (n_++);
}
private:
/// Print events recorded in this list.
/// \param[in,out] os The output stream.
/// \return The modified output stream.
virtual std::ostream& print_events(std::ostream& os) const {
const int thread_id = ThreadBase::this_thread()->get_pool_thread_index();
for(std::size_t i = 0; i < n_; ++i)
os << thread_id << "\t" << events_[i] << std::endl;
return os;
}
}; // class TaskEventList
/// This class collects and prints task profiling data.
/// \note Each thread has its own \c TaskProfiler object, so only one
/// thread will ever operate on this object at a time and all operations
/// are inheirently thread safe.
class TaskProfiler {
private:
TaskEventListBase* head_; ///< The head of the linked list of data.
TaskEventListBase* tail_; ///< The tail of the linked list of data.
static Mutex output_mutex_; ///< Mutex used to lock the output file.
TaskProfiler(const TaskProfiler&) = delete;
TaskProfiler& operator=(const TaskProfiler&) = delete;
public:
/// The output file name.
/// This variable is initialized by \c ThreadPool::begin and is
/// assigned the value given by the environment variable
/// `MAD_TASKPROFILER_NAME`.
static const char* output_file_name_;
public:
/// Default constructor.
TaskProfiler()
: head_(nullptr), tail_(nullptr)
{ }
/// Destructor.
~TaskProfiler() {
// Cleanup linked list
TaskEventListBase* next = nullptr;
while(head_ != nullptr) {
next = head_->next();
delete head_;
head_ = next;
}
}
/// Create a new task event list.
/// \param[in] nmax The maximum number of elements that the list
/// can contain.
/// \return A new task event list.
TaskEventList* new_list(const std::size_t nmax) {
// Create a new event list
TaskEventList* list = new TaskEventList(nmax);
// Append the list to the tail of the linked list
if(head_ != nullptr) {
tail_->insert(list);
tail_ = list;
} else {
head_ = list;
tail_ = list;
}
return list;
}
/// Write the profile data to file.
/// The data is cleared after it is written to the file, so this
/// function may be called more than once.
///
/// \warning This function should only be called from the thread
/// that owns it, otherwise data will likely be corrupted.
///
/// \note This function is thread safe, in that it may be called by
/// different objects in different threads simultaneously.
void write_to_file();
}; // class TaskProfiler
} // namespace profiling
#endif // MADNESS_TASK_PROFILING
/// Lowest level task interface.
/// The pool invokes \c run_multi_threaded(), which does any necessary
/// setup for multiple threads, and then invokes the user's \c run() method.
class PoolTaskInterface :
#ifdef HAVE_INTEL_TBB
public tbb::task,
#endif // HAVE_INTEL_TBB
public TaskAttributes
{
friend class ThreadPool;
private:
#ifdef MADNESS_TASK_PROFILING
profiling::TaskEvent* task_event_; ///< \todo Description needed.
double submit_time_; ///< \todo Description needed.
std::pair<void*, unsigned short> id_; ///< \todo Description needed.
/// \todo Brief description needed.
/// \todo Descriptions needed.
/// \param[in,out] task_event Description needed.
void set_event(profiling::TaskEvent* task_event) {
task_event_ = task_event;
}
/// Collect info on the task and record the submit time.
void submit() {
submit_time_ = wall_time();
this->get_id(id_);
}
#endif // MADNESS_TASK_PROFILING
/// Object that is used to convert function and member function pointers into `void*`.
/// \note This is technically not supported by the C++ standard but
/// it will likely not cause any issues here (famous last words?).
/// \todo Descriptions needed.
/// \tparam T Description needed.
template <typename T>
union FunctionPointerGrabber {
T in; ///< \todo Description needed.
void* out; ///< \todo Description needed.
};
protected:
/// \todo Brief description needed.
/// \todo Descriptions needed.
/// \tparam fnT Description needed.
/// \param[in,out] id Description needed.
/// \param[in] fn Description needed.
/// \return Description needed.
template <typename fnT>
static typename std::enable_if<detail::function_traits<fnT>::value ||
detail::memfunc_traits<fnT>::value>::type
make_id(std::pair<void*,unsigned short>& id, fnT fn) {
FunctionPointerGrabber<fnT> poop;
poop.in = fn;
id.first = poop.out;
id.second = 1ul;
}
/// \todo Brief description needed.
/// \todo Descriptions needed. What is the purpose of the second argument?
/// \tparam fnobjT Description needed.
/// \param[in,out] id Description needed.
template <typename fnobjT>
static typename std::enable_if<!(detail::function_traits<fnobjT>::value ||
detail::memfunc_traits<fnobjT>::value) >::type
make_id(std::pair<void*,unsigned short>& id, const fnobjT&) {
id.first = reinterpret_cast<void*>(const_cast<char*>(typeid(fnobjT).name()));
id.second = 2ul;
}
private:
/// \todo Brief description needed.
/// \todo Descriptions needed.
/// \param[in,out] id Description needed.
virtual void get_id(std::pair<void*,unsigned short>& id) const {
id.first = nullptr;
id.second = 0ul;
}
#ifndef HAVE_INTEL_TBB
Barrier* barrier; ///< Barrier, only allocated for multithreaded tasks.
AtomicInt count; ///< Used to count threads as they start.
/// Returns true for the one thread that should invoke the destructor.
/// \return True for the one thread that should invoke the destructor.
bool run_multi_threaded() {
// As a thread enters this routine it increments the shared counter
// to generate a unique id without needing any thread-local storage.
// A downside is this does not preserve any relationships between thread
// numbering and the architecture ... more work ahead.
int nthread = get_nthread();
if (nthread == 1) {
#ifdef MADNESS_TASK_PROFILING
task_event_->start(id_, nthread, submit_time_);
#endif // MADNESS_TASK_PROFILING
run(TaskThreadEnv(1,0,0));
#ifdef MADNESS_TASK_PROFILING
task_event_->stop();
#endif // MADNESS_TASK_PROFILING
return true;
}
else {
int id = count++;
volatile bool barrier_flag;
barrier->register_thread(id, &barrier_flag);
#ifdef MADNESS_TASK_PROFILING
if(id == 0)
task_event_->start(id_, nthread, submit_time_);
#endif // MADNESS_TASK_PROFILING
run(TaskThreadEnv(nthread, id, barrier));
#ifdef MADNESS_TASK_PROFILING
const bool cleanup = barrier->enter(id);
if(cleanup) task_event_->stop();
return cleanup;
#else
return barrier->enter(id);
#endif // MADNESS_TASK_PROFILING
}
}
public:
/// Default constructor.
PoolTaskInterface()
: TaskAttributes()
, barrier(nullptr)
{
#if HAVE_PARSEC
init_exec_context();
#endif
count = 0;
}
/// Contructor setting teh speicified task attributes.
/// \param[in] attr The task attributes.
explicit PoolTaskInterface(const TaskAttributes& attr)
: TaskAttributes(attr)
, barrier(attr.get_nthread()>1 ? new Barrier(attr.get_nthread()) : 0)
{
#if HAVE_PARSEC
init_exec_context();
#endif
count = 0;
}
/// Destructor.
/// \todo Should we either use a unique_ptr for barrier or check that barrier != nullptr here?
virtual ~PoolTaskInterface() {
delete barrier;
}
/// Call this to reset the number of threads before the task is submitted.
/// Once a task has been constructed, /c TaskAttributes::set_nthread()
/// is insufficient because a multithreaded task includes a barrier
/// that needs to know the number of threads.
///
/// \param[in] nthread The new number of threads.
void set_nthread(int nthread) {
if (nthread != get_nthread()) {
TaskAttributes::set_nthread(nthread);
delete barrier;
if (nthread > 1)
barrier = new Barrier(nthread);
else
barrier = 0;
}
}
#if HAVE_PARSEC
//////////// Parsec Related Begin ////////////////////
dague_execution_context_t exec_context;
static const dague_function_t* func;
/* This function initializes exec_context from the one in parsec.cpp*/
void init_exec_context(void)
{
exec_context.dague_handle = &madness::madness_handle;
exec_context.function = &madness::madness_function;
exec_context.chore_id = 0;
exec_context.status = DAGUE_TASK_STATUS_NONE;
exec_context.priority = is_high_priority() ? 1000 : 0; // 1 & 0 would work as good
((PoolTaskInterface **)exec_context.locals)[0] = this;
}
//////////// Parsec Related End ///////////////////
#endif
#else
public:
/// Default constructor.
PoolTaskInterface() : TaskAttributes() {
}
/// \todo Brief description needed.
/// \todo Descriptions needed.
/// \param[in] attr Description needed.
explicit PoolTaskInterface(const TaskAttributes& attr) :
TaskAttributes(attr)
{
}
/// Destructor.
virtual ~PoolTaskInterface() = default;
/// Call this to reset the number of threads before the task is submitted
/// Once a task has been constructed /c TaskAttributes::set_nthread()
/// is insufficient because a multithreaded task includes a
/// barrier that needs to know the number of threads.
void set_nthread(int nthread) {
if (nthread != get_nthread())
TaskAttributes::set_nthread(nthread);
}
/// \todo Brief description needed.
/// \todo Descriptions needed.
/// \return Description needed.
tbb::task* execute() {
const int nthread = get_nthread();
run( TaskThreadEnv(nthread, 0) );
return nullptr;
}
/// \todo Brief description needed.
/// \todo Descriptions needed.
/// \throw std::bad_alloc Description needed.
/// \param[in] size Description needed.
/// \return Description needed.
static inline void * operator new(std::size_t size) throw(std::bad_alloc) {
return ::operator new(size, tbb::task::allocate_root());
}
/// Destroy a task object.
/// \param[in,out] p Pointer to the task object (or array of task
/// objects) to be destroyed.
/// \param[in] size The size of the array.
static inline void operator delete(void* p, std::size_t size) throw() {
if(p != nullptr) {
tbb::task::destroy(*reinterpret_cast<tbb::task*>(p));
}
}
#endif // HAVE_INTEL_TBB
/// Override this method to implement a multi-threaded task.
/// \c info.nthread() will be the number of threads collaborating on this task.
///
/// \c info.id() will be the index of the current thread \c id=0,...,nthread-1.
///
/// \c info.barrier() will be a barrier for all of the threads, and returns
/// true for the last thread to enter the barrier (other threads get false).
///
/// \todo Description needed.
/// \param[in] info Description needed.
virtual void run(const TaskThreadEnv& info) = 0;
};
/// A no-operation task used for various purposes.
class PoolTaskNull : public PoolTaskInterface {
public:
/// Execution function that does nothing.
void run(const TaskThreadEnv& /*info*/) {}
/// Destructor.
virtual ~PoolTaskNull() {}
private:
/// \todo Brief description needed.
/// \todo Description needed.
/// \param[in,out] id Description needed.
virtual void get_id(std::pair<void*,unsigned short>& id) const {
PoolTaskInterface::make_id(id, &PoolTaskNull::run);
}
};
/// \c ThreadPool thread object.
/// This class holds thread local data for thread pool threads. It can be
/// accessed via \c ThreadBase::this_thread().
class ThreadPoolThread : public Thread {
private:
// Thread local data for thread pool
#ifdef MADNESS_TASK_PROFILING
profiling::TaskProfiler profiler_; ///< \todo Description needed.
#endif // MADNESS_TASK_PROFILING
public:
ThreadPoolThread() : Thread() { }
virtual ~ThreadPoolThread() = default;
#ifdef MADNESS_TASK_PROFILING
/// Task profiler accessor.
/// \todo Description needed.
/// \return Description needed.
profiling::TaskProfiler& profiler() {
return profiler_;
}
#endif // MADNESS_TASK_PROFILING
};
/// A singleton pool of threads for dynamic execution of tasks.
/// \attention You must instantiate the pool while running with just one
/// thread.
class ThreadPool {
private:
friend class WorldTaskQueue;
// Thread pool data
ThreadPoolThread *threads; ///< Array of threads.
ThreadPoolThread main_thread; ///< Placeholder for main thread tls.
DQueue<PoolTaskInterface*> queue; ///< Queue of tasks.
int nthreads; ///< Number of threads.
volatile bool finish; ///< Set to true when time to stop.
AtomicInt nfinished; ///< Thread pool exit counter.
// Static data
static ThreadPool* instance_ptr; ///< Singleton pointer.
static const int nmax = 128; ///< Number of task a worker thread will pop from the task queue
static double await_timeout; ///< Waiter timeout.
#if defined(HAVE_IBMBGQ) and defined(HPM)
static unsigned int main_hpmctx; ///< HPM context for main thread.
#endif
/// The constructor is private to enforce the singleton model.
/// \todo Description needed.
/// \param[in] nthread Description needed.
ThreadPool(int nthread=-1);
/// \todo Could we use C++11's `= delete` to hide this?
ThreadPool(const ThreadPool&); // Verboten
/// \todo Could we use C++11's `= delete` to hide this?
void operator=(const ThreadPool&); // Verboten
/// Get the number of threads from the environment.
/// \return The number of threads.
int default_nthread();
/// Run the next task.
/// \todo Verify and complete this documentation.
/// \param[in] wait Block of true.
/// \param[in,out] this_thread Description needed.
/// \return True if a task was run.
bool run_task(bool wait, ThreadPoolThread* this_thread) {
#if HAVE_INTEL_TBB
MADNESS_EXCEPTION("run_task should not be called when using Intel TBB", 1);
#else
if (!wait && queue.empty()) return false;
std::pair<PoolTaskInterface*,bool> t = queue.pop_front(wait);
#ifdef MADNESS_TASK_PROFILING
profiling::TaskEventList* event_list =
this_thread->profiler().new_list(1);
#endif // MADNESS_TASK_PROFILING
// Task pointer might be zero due to stealing
if (t.second && t.first) {
#ifdef MADNESS_TASK_PROFILING
t.first->set_event(event_list->event());
#endif // MADNESS_TASK_PROFILING
if (t.first->run_multi_threaded()) // What we are here to do
delete t.first;
}
return t.second;
#endif
}
/// \todo Brief description needed.
/// \todo Descriptions needed.
/// \param[in] wait Description needed.
/// \param[in,out] this_thread Description needed.
/// \return Description needed.
bool run_tasks(bool wait, ThreadPoolThread* const this_thread) {
#if HAVE_INTEL_TBB
// if (!wait && tbb_task_list->empty()) return false;
// tbb::task* t = &tbb_task_list->pop_front();
// if (t) {
// tbb_parent_task->increment_ref_count();
// tbb_parent_task->enqueue(*t);
// }
// wait = (tbb_parent_task->ref_count() >= 1) ? false : true;
// return wait;
MADNESS_EXCEPTION("run_tasks should not be called when using Intel TBB", 1);
#else
PoolTaskInterface* taskbuf[nmax];
int ntask = queue.pop_front(nmax, taskbuf, wait);
#ifdef MADNESS_TASK_PROFILING
profiling::TaskEventList* event_list =
this_thread->profiler().new_list(ntask);
#endif // MADNESS_TASK_PROFILING
for (int i=0; i<ntask; ++i) {
if (taskbuf[i]) { // Task pointer might be zero due to stealing
#ifdef MADNESS_TASK_PROFILING
taskbuf[i]->set_event(event_list->event());
#endif // MADNESS_TASK_PROFILING
if (taskbuf[i]->run_multi_threaded()) {
delete taskbuf[i];
}
}
}
return (ntask>0);
#endif
}
/// \todo Brief description needed.
/// \todo Description needed.
/// \param[in,out] thread Description needed.
void thread_main(ThreadPoolThread* const thread);
/// Forwards the thread to bound member function.
/// \todo Descriptions needed.
/// \param[in] v Description needed.
/// \return Description needed.
static void* pool_thread_main(void *v);
/// Return a pointer to the only instance, constructing as necessary.
/// \return A pointer to the only instance.
static ThreadPool* instance() {
#ifndef MADNESS_ASSERTIONS_DISABLE
if(! instance_ptr) {
std::cerr << "!!! ERROR: The thread pool has not been initialized.\n"
<< "!!! ERROR: Call madness::initialize before submitting tasks to the task queue.\n";
MADNESS_EXCEPTION("ThreadPool::instance_ptr is NULL", 0);
}
#endif
return instance_ptr;
}
public:
#if HAVE_PARSEC
////////////////// Parsec Related Begin //////////////////
static dague_context_t *parsec;
///////////////// Parsec Related End ////////////////////
#endif
#if HAVE_INTEL_TBB
static tbb::task_scheduler_init* tbb_scheduler; ///< \todo Description needed.
#endif
/// Please invoke while in a single-threaded environment.
/// \todo Verify documentation.
/// \param[in] nthread The number of threads.
static void begin(int nthread=-1);
/// \todo Description needed.
static void end();
/// Add a new task to the pool.
/// \todo Description needed.
/// \param[in,out] task Description needed.
static void add(PoolTaskInterface* task) {
#ifdef MADNESS_TASK_PROFILING
task->submit();
#endif // MADNESS_TASK_PROFILING
//////////// Parsec Related Begin ////////////////////
/* Initialize the execution context and give it to the scheduler*/
#if HAVE_PARSEC
dague_execution_context_t *context = &(task->exec_context);
DAGUE_LIST_ITEM_SINGLETON(context);
dague_atomic_add_32b(&madness_handle.nb_tasks, 1);
__dague_schedule(parsec->virtual_processes[0]->execution_units[0], context);
//////////// Parsec Related End ////////////////////
#elif HAVE_INTEL_TBB
if(task->is_high_priority()) {
tbb::task::spawn(*task);
} else {
tbb::task::enqueue(*task);
}
#else
if (!task) MADNESS_EXCEPTION("ThreadPool: inserting a NULL task pointer", 1);
int task_threads = task->get_nthread();
// Currently multithreaded tasks must be shoved on the end of the q
// to avoid a race condition as multithreaded task is starting up
if (task->is_high_priority() && (task_threads == 1)) {
instance()->queue.push_front(task);
}
else {
instance()->queue.push_back(task, task_threads);
}
#endif // HAVE_INTEL_TBB
}
/// \todo Brief description needed.
/// \todo Descriptions needed.
/// \tparam opT Description needed.
/// \param[in,out] op Description needed.
template <typename opT>
void scan(opT& op) {
queue.scan(op);
}
/// Add a vector of tasks to the pool.
/// \param[in] tasks Vector of tasks to add to the pool.
static void add(const std::vector<PoolTaskInterface*>& tasks) {
#if HAVE_INTEL_TBB
MADNESS_EXCEPTION("Do not add tasks to the madness task queue when using Intel TBB.", 1);
#else
typedef std::vector<PoolTaskInterface*>::const_iterator iteratorT;
for (iteratorT it=tasks.begin(); it!=tasks.end(); ++it) {
add(*it);
}
#endif
}
/// An otherwise idle thread can all this to run a task.
/// \return True if a task was run.
static bool run_task() {
#ifdef HAVE_INTEL_TBB
// Construct a the parent task
tbb::task& waiter = *new( tbb::task::allocate_root() ) tbb::empty_task;
waiter.set_ref_count(2);
// Create a dummy task that we send throught the queue.
tbb::task& dummy = *new( waiter.allocate_child() ) tbb::empty_task;
tbb::task::enqueue(dummy);
// Run tasks while we wait for the dummy task.
waiter.wait_for_all();
// destroy the waiter
tbb::task::destroy(waiter);
return false;
#else
#ifdef MADNESS_TASK_PROFILING
ThreadPoolThread* const thread = static_cast<ThreadPoolThread*>(ThreadBase::this_thread());
#else
ThreadPoolThread* const thread = nullptr;
#endif // MADNESS_TASK_PROFILING
return instance()->run_tasks(false, thread);
#endif // HAVE_INTEL_TBB
}
/// Returns the number of threads in the pool.
/// \return The number of threads in the pool.
static std::size_t size() {
return instance()->nthreads;
}
/// Returns the number of tasks in the queue.
/// \return The number of tasks in the queue.
static std::size_t queue_size() {
return instance()->queue.size();
}
/// Returns queue statistics.
/// \return Queue statistics.
static const DQStats& get_stats();
/// Gracefully wait for a condition to become true, executing any tasks in the queue.
/// Probe should be an object that, when called, returns the status.
/// \todo Descriptions needed/need verification.
/// \tparam Probe Type of the probe.
/// \param[in] probe The probe.
/// \param[in] dowork Do work while waiting - default is true
/// \param[in] sleep Sleep instead of spin while waiting (e.g., to avoid pounding on MPI) - default is false
template <typename Probe>
static void await(const Probe& probe, bool dowork = true, bool sleep = false) {
double start = cpu_time();
const double timeout = await_timeout;
int counter = 0;
MutexWaiter waiter;
while (!probe()) {
const bool working = (dowork ? ThreadPool::run_task() : false);
const double current_time = cpu_time();
if (working) { // Reset timeout logic
waiter.reset();
start = current_time;
counter = 0;
} else {
if(((current_time - start) > timeout) && (timeout > 1.0)) { // Check for timeout
std::cout << "!!MADNESS: Hung queue?" << std::endl;
if(counter++ > 3)
throw madness::MadnessException("ThreadPool::await() timeout",
0, 1, __LINE__, __FUNCTION__, __FILE__);
}
if (sleep) {
// THIS NEEDS TO BECOME AN EXTERNAL PARAMETER
// Problem is exacerbated when running with many
// (e.g., 512 or more) send/recv buffers, and
// also with many threads. More outstanding
// requests means each call into MPI takes
// longer and more threads means more calls in
// spots where all threads are messaging. Old
// code was OK on dancer.icl.utk.edu with just
// 32 bufs and 20 threads, but 512 bufs caused
// intermittent hangs I think due to something
// not being able to make progress or general
// confusion (this with MPICH) ... maybe using a
// fair mutex somewhere would help.
//
// 100us is a long time ... will try 10us. mmm ... perhaps need 100 at least on dancer with 17 threads per node
myusleep(100);
}
else {
waiter.wait();
}
}
}
}
/// Desctructor.
~ThreadPool() {
#if HAVE_PARSEC
////////////////// Parsec related Begin /////////////////
/* End of scheduling*/
dague_fini((dague_context_t **)&parsec);
////////////////// Parsec related End /////////////////
#elif HAVE_INTEL_TBB
tbb_scheduler->terminate();
delete(tbb_scheduler);
#endif
}
};
/// @}
}
#endif // MADNESS_WORLD_THREAD_H__INCLUDED
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