RooFit::MultiProcess::ProcessManager Class Reference

Fork processes for queue and workers.

This class manages three types of processes:

1. master: the initial main process. It defines and enqueues tasks and processes results.
2. workers: a pool of processes that will try to take tasks from the queue. These are forked from master.
3. queue: This process runs the queue_loop and maintains the queue of tasks. It is also forked from master.

Parameters

N_workers

Number of worker processes to spawn.

Definition at line 26 of file ProcessManager.h.

Public Member Functions
	ProcessManager (std::size_t N_workers)
	~ProcessManager ()
pid_t	get_queue_pid () const
std::vector< pid_t >	get_worker_pids ()
void	identify_processes () const
	Print to stdout which type of process we are on and what its PID is (for debugging)
bool	is_initialized () const
bool	is_master () const
bool	is_queue () const
bool	is_worker () const
std::size_t	N_workers () const
void	terminate () noexcept
	Shutdown forked processes if on master and if this process manager is initialized.
void	wait_for_sigterm_then_exit ()
std::size_t	worker_id () const

Static Public Member Functions
static void	handle_sigterm (int signum)
	We need this to tell the children to die, because we can't talk to them anymore during JobManager destruction, because that kills the Messenger first.
static bool	sigterm_received ()

Private Member Functions
void	initialize_processes (bool cpu_pinning=true)
	Fork processes and activate CPU pinning.
void	shutdown_processes ()
	Shutdown forked processes if on master.

Private Attributes
bool	initialized_ = false
bool	is_master_ = false
bool	is_queue_ = false
bool	is_worker_ = false
std::size_t	N_workers_
friend	Queue
pid_t	queue_pid_
std::size_t	worker_id_
std::vector< pid_t >	worker_pids_

Static Private Attributes
static volatile sig_atomic_t	sigterm_received_ = 0

#include </home/sftnight/build/workspace/root-makedoc-master/rootspi/rdoc/src/master/roofit/multiprocess/res/RooFit/MultiProcess/ProcessManager.h>

Constructor & Destructor Documentation

ProcessManager()

RooFit::MultiProcess::ProcessManager::ProcessManager ( std::size_t  N_workers )

explicit

Definition at line 41 of file ProcessManager.cxx.

~ProcessManager()

RooFit::MultiProcess::ProcessManager::~ProcessManager

(

)

Definition at line 58 of file ProcessManager.cxx.

Member Function Documentation

get_queue_pid()

pid_t RooFit::MultiProcess::ProcessManager::get_queue_pid ( ) const

inline

Definition at line 50 of file ProcessManager.h.

get_worker_pids()

std::vector< pid_t > RooFit::MultiProcess::ProcessManager::get_worker_pids ( )

inline

Definition at line 51 of file ProcessManager.h.

handle_sigterm()

void RooFit::MultiProcess::ProcessManager::handle_sigterm ( int  signum )

static

We need this to tell the children to die, because we can't talk to them anymore during JobManager destruction, because that kills the Messenger first.

We do that with SIGTERMs. The sigterm_received() should be checked in message loops to stop them when it's true.

Definition at line 75 of file ProcessManager.cxx.

identify_processes()

void RooFit::MultiProcess::ProcessManager::identify_processes

(

)

const

Print to stdout which type of process we are on and what its PID is (for debugging)

Definition at line 318 of file ProcessManager.cxx.

initialize_processes()

void RooFit::MultiProcess::ProcessManager::initialize_processes ( bool  cpu_pinning = true )

private

Fork processes and activate CPU pinning.

Parameters

cpu_pinning

Activate CPU pinning if true. Effective on Linux only.

Definition at line 111 of file ProcessManager.cxx.

is_initialized()

bool RooFit::MultiProcess::ProcessManager::is_initialized

(

)

const

Definition at line 204 of file ProcessManager.cxx.

is_master()

bool RooFit::MultiProcess::ProcessManager::is_master

(

)

const

Definition at line 292 of file ProcessManager.cxx.

is_queue()

bool RooFit::MultiProcess::ProcessManager::is_queue

(

)

const

Definition at line 297 of file ProcessManager.cxx.

is_worker()

bool RooFit::MultiProcess::ProcessManager::is_worker

(

)

const

Definition at line 302 of file ProcessManager.cxx.

N_workers()

std::size_t RooFit::MultiProcess::ProcessManager::N_workers

(

)

const

Definition at line 312 of file ProcessManager.cxx.

shutdown_processes()

void RooFit::MultiProcess::ProcessManager::shutdown_processes ( )

private

Shutdown forked processes if on master.

Definition at line 266 of file ProcessManager.cxx.

sigterm_received()

bool RooFit::MultiProcess::ProcessManager::sigterm_received ( )

static

Definition at line 81 of file ProcessManager.cxx.

terminate()

void RooFit::MultiProcess::ProcessManager::terminate ( )

noexcept

Shutdown forked processes if on master and if this process manager is initialized.

Definition at line 210 of file ProcessManager.cxx.

wait_for_sigterm_then_exit()

void RooFit::MultiProcess::ProcessManager::wait_for_sigterm_then_exit

(

)

Definition at line 222 of file ProcessManager.cxx.

worker_id()

std::size_t RooFit::MultiProcess::ProcessManager::worker_id

(

)

const

Definition at line 307 of file ProcessManager.cxx.

Member Data Documentation

initialized_

bool RooFit::MultiProcess::ProcessManager::initialized_ = false

private

Definition at line 67 of file ProcessManager.h.

is_master_

bool RooFit::MultiProcess::ProcessManager::is_master_ = false

private

Definition at line 57 of file ProcessManager.h.

is_queue_

bool RooFit::MultiProcess::ProcessManager::is_queue_ = false

private

Definition at line 58 of file ProcessManager.h.

is_worker_

bool RooFit::MultiProcess::ProcessManager::is_worker_ = false

private

Definition at line 59 of file ProcessManager.h.

N_workers_

std::size_t RooFit::MultiProcess::ProcessManager::N_workers_

private

Definition at line 61 of file ProcessManager.h.

Queue

friend RooFit::MultiProcess::ProcessManager::Queue

private

Definition at line 27 of file ProcessManager.h.

queue_pid_

pid_t RooFit::MultiProcess::ProcessManager::queue_pid_

private

Definition at line 65 of file ProcessManager.h.

sigterm_received_

volatile sig_atomic_t RooFit::MultiProcess::ProcessManager::sigterm_received_ = 0

staticprivate

Definition at line 69 of file ProcessManager.h.

worker_id_

std::size_t RooFit::MultiProcess::ProcessManager::worker_id_

private

Definition at line 60 of file ProcessManager.h.

worker_pids_

std::vector<pid_t> RooFit::MultiProcess::ProcessManager::worker_pids_

private

Definition at line 64 of file ProcessManager.h.