A class that implemnets a MemoryManager service to simulate Linux in-memory page caching for I/O operations. More...

#include <MemoryManager.h>

Inheritance diagram for wrench::MemoryManager:

Public Member Functions
void	addToCache (std::string filename, std::shared_ptr< FileLocation > location, double amount, bool is_dirty)
	Add a file to cache. More...

double	evict (double amount, std::string excluded_filename)
	Evicted clean data from page cache. More...

void	export_log (std::string filename)
	Export the log to a file. More...

double	flush (double amount, std::string excluded_filename)
	Flush dirty data from cache. More...

double	getAvailableMemory ()
	Get currently available cache memory. More...

double	getCachedAmount (std::string filename)
	Get amount of cached data of a file in cache. More...

std::vector< Block * >	getCachedBlocks (std::string filename)
	Get list of cached blocks of a file. More...

double	getDirty () const
	Get number of dirty bytes. More...

double	getDirtyRatio () const
	Get the dirty ratio. More...

double	getEvictableMemory ()
	Get current evictable memory. More...

double	getFreeMemory () const
	Get the amount of free memory. More...

simgrid::s4u::Disk *	getMemory () const
	Get the memory disk. More...

double	getTotalCachedAmount () const
	Get total number of cached bytes. More...

double	getTotalMemory ()
	Get total available cache memory. More...

void	kill ()
	Immediately terminate periodical flushing.

void	log ()
	Append to the log.

void	readChunkFromCache (std::string filename, double amount)
	Simulate a read from cache, re-access and update cached file data. More...

simgrid::s4u::IoPtr	readToCache (std::string filename, std::shared_ptr< FileLocation > location, double amount, bool async)
	Read data from disk to cache. More...

void	releaseMemory (double released_amt)
	Release memory. More...

void	setDirtyRatio (double dirty_ratio)
	Set the dirty ratio. More...

void	setMemory (simgrid::s4u::Disk *memory)
	Set the memory disk. More...

void	useAnonymousMemory (double used_amt)
	Update the amount of used memory. More...

void	writebackToCache (std::string filename, std::shared_ptr< FileLocation > location, double amount, bool is_dirty)
	Simulate a file write to cache. More...

Public Member Functions inherited from wrench::Service
void	assertServiceIsUp ()
	Throws an exception if the service is not up. More...

std::string	getHostname ()
	Get the name of the host on which the service is / will be running. More...

double	getMessagePayloadValue (std::string)
	Get a message payload of the Service as a double. More...

double	getNetworkTimeoutValue ()
	Returns the service's network timeout value. More...

bool	getPropertyValueAsBoolean (std::string)
	Get a property of the Service as a boolean. More...

double	getPropertyValueAsDouble (std::string)
	Get a property of the Service as a double. More...

std::string	getPropertyValueAsString (std::string)
	Get a property of the Service as a string. More...

unsigned long	getPropertyValueAsUnsignedLong (std::string)
	Get a property of the Service as an unsigned long. More...

bool	isUp ()
	Returns true if the service is UP, false otherwise. More...

void	resume ()
	Resume the service. More...

void	setNetworkTimeoutValue (double value)
	Sets the service's network timeout value. More...

void	setStateToDown ()
	Set the state of the service to DOWN.

void	start (std::shared_ptr< Service > this_service, bool daemonize, bool auto_restart)
	Start the service. More...

virtual void	stop ()
	Synchronously stop the service (does nothing if the service is already stopped) More...

void	suspend ()
	Suspend the service.

Public Member Functions inherited from wrench::S4U_Daemon
	S4U_Daemon (std::string hostname, std::string process_name_prefix, std::string mailbox_prefix)
	Constructor (daemon with a mailbox) More...

virtual	~S4U_Daemon ()

virtual void	cleanup (bool has_returned_from_main, int return_value)
	Cleanup function called when the daemon terminates (for whatever reason). The default behavior is to throw an exception if the host is off. This method should be overriden in a daemons implements some fault-tolerant behavior, or is naturally tolerant. More...

void	createLifeSaver (std::shared_ptr< S4U_Daemon > reference)
	Create a life saver for the daemon. More...

std::string	getName ()
	Retrieve the process name. More...

int	getReturnValue ()
	Returns the value returned by main() (if the daemon has returned from main) More...

S4U_Daemon::State	getState ()
	Get the daemon's state. More...

bool	hasReturnedFromMain ()
	Returns true if the daemon has returned from main() (i.e., not brutally killed) More...

bool	isDaemonized ()
	Return the daemonized status of the daemon. More...

bool	isSetToAutoRestart ()
	Return the auto-restart status of the daemon. More...

std::pair< bool, int >	join ()
	Join (i.e., wait for) the daemon. More...

void	resumeActor ()
	Resume the daemon/actor.

void	setupOnExitFunction ()
	Sets up the on_exit functionf for the actor.

void	startDaemon (bool daemonized, bool auto_restart)
	Start the daemon. More...

void	suspendActor ()
	Suspend the daemon/actor.

Static Public Member Functions
static simgrid::s4u::Disk *	getDisk (std::string mountpoint, std::string hostname)
	Retrieve the disk where the file is stored. More...

static std::shared_ptr< MemoryManager >	initAndStart (Simulation simulation, simgrid::s4u::Disk memory, double dirty_ratio, int interval, int expired_time, std::string hostname)
	Initialize and start the memory_manager_service manager. More...

Static Public Member Functions inherited from wrench::Service
static void	cleanupTrackedServices ()
	Go through the tracked services and remove all entries with a refcount of 1!

static void	clearTrackedServices ()
	Forget all tracked services.

static void	increaseNumCompletedServicesCount ()
	Increase the completed service count.

Additional Inherited Members
Public Types inherited from wrench::S4U_Daemon
enum	State { UP, DOWN, SUSPENDED }
	Daemon states. More...

Public Attributes inherited from wrench::S4U_Daemon
std::string	hostname
	The name of the host on which the daemon is running.

std::string	initial_mailbox_name
	The initial name of the daemon's mailbox.

LifeSaver *	life_saver = nullptr
	The daemon's life saver.

std::string	mailbox_name
	The current name of the daemon's mailbox.

std::string	process_name
	The name of the daemon.

Simulation *	simulation
	a pointer to the simulation object

Protected Member Functions inherited from wrench::Service
	Service (std::string hostname, std::string process_name_prefix, std::string mailbox_name_prefix)
	Constructor. More...

	~Service ()
	Destructor.

template<class T >
std::shared_ptr< T >	getSharedPtr ()
	Method to retrieve the shared_ptr to a service. More...

void	serviceSanityCheck ()
	Check whether the service is properly configured and running. More...

void	setMessagePayload (std::string, double)
	Set a message payload of the Service. More...

void	setMessagePayloads (std::map< std::string, double > default_messagepayload_values, std::map< std::string, double > overriden_messagepayload_values)
	Set default and user-defined message payloads. More...

void	setProperties (std::map< std::string, std::string > default_property_values, std::map< std::string, std::string > overriden_property_values)
	Set default and user-defined properties. More...

void	setProperty (std::string, std::string)
	Set a property of the Service. More...

Protected Member Functions inherited from wrench::S4U_Daemon
void	acquireDaemonLock ()
	Lock the daemon's lock.

void	killActor ()
	Kill the daemon/actor (does nothing if already dead) More...

void	releaseDaemonLock ()
	Unlock the daemon's lock.

void	runMainMethod ()
	Method that run's the user-defined main method (that's called by the S4U actor class)

Static Protected Member Functions inherited from wrench::Service
static void	assertServiceIsUp (std::shared_ptr< Service > s)
	Assert for the service being up. More...

template<class T >
static std::shared_ptr< T >	getServiceByName (std::string name)
	Method to retrieve the shared_ptr to a service based on the service's name (not efficient) More...

Protected Attributes inherited from wrench::Service
std::map< std::string, double >	messagepayload_list
	The service's messagepayload list.

std::string	name
	The service's name.

double	network_timeout = 30.0
	The time (in seconds) after which a service that doesn't send back a reply (control) message causes a NetworkTimeOut exception. (default: 30 second; if <0 never timeout)

std::map< std::string, std::string >	property_list
	The service's property list.

Protected Attributes inherited from wrench::S4U_Daemon
unsigned int	num_starts = 0
	The number of time that this daemon has started (i.e., 1 + number of restarts)

State	state
	The service's state.

Detailed Description

A class that implemnets a MemoryManager service to simulate Linux in-memory page caching for I/O operations.

Member Function Documentation

◆ addToCache()

void wrench::MemoryManager::addToCache	(	std::string	filename,
		std::shared_ptr< FileLocation >	location,
		double	amount,
		bool	is_dirty
	)

Add a file to cache.

Parameters

filename	file name
location	file location
amount	number of bytes
is_dirty	true or false

◆ evict()

double wrench::MemoryManager::evict	(	double	amount,
		std::string	excluded_filename
	)

Evicted clean data from page cache.

Parameters

amount	the requested amount of data to be evicted
excluded_filename	name of file that cannot be evicted

Returns: evicted amount

◆ export_log()

void wrench::MemoryManager::export_log ( std::string filename )

Export the log to a file.

Parameters

filename file path

◆ flush()

double wrench::MemoryManager::flush	(	double	amount,
		std::string	excluded_filename
	)

Flush dirty data from cache.

Parameters

amount	request amount to be flushed
excluded_filename	name of file to exclude

Returns: flushed amount

◆ getAvailableMemory()

double wrench::MemoryManager::getAvailableMemory ( )

Get currently available cache memory.

Returns: a number of bytes

◆ getCachedAmount()

double wrench::MemoryManager::getCachedAmount ( std::string filename )

Get amount of cached data of a file in cache.

Parameters

filename name of the file

Returns: the amount of cached data

◆ getCachedBlocks()

std::vector< Block * > wrench::MemoryManager::getCachedBlocks ( std::string filename )

Get list of cached blocks of a file.

Parameters

filename : name of the file

Returns: a vector of cached blocks of the file

◆ getDirty()

double wrench::MemoryManager::getDirty ( ) const

Get number of dirty bytes.

Returns: a number of bytes

◆ getDirtyRatio()

double wrench::MemoryManager::getDirtyRatio ( ) const

Get the dirty ratio.

Returns: the dirty ratio

◆ getDisk()

simgrid::s4u::Disk * wrench::MemoryManager::getDisk	(	std::string	mountpoint,
		std::string	hostname
	)

static

Retrieve the disk where the file is stored.

Parameters

mountpoint	mountpoint on the disk where the file is stored
hostname	host at which the file is stored

Returns

◆ getEvictableMemory()

double wrench::MemoryManager::getEvictableMemory ( )

Get current evictable memory.

Returns: a number of bytes

◆ getFreeMemory()

double wrench::MemoryManager::getFreeMemory ( ) const

Get the amount of free memory.

Returns: a number of bytes

◆ getMemory()

simgrid::s4u::Disk * wrench::MemoryManager::getMemory ( ) const

Get the memory disk.

Returns: the disk that acts as the memory cache

◆ getTotalCachedAmount()

double wrench::MemoryManager::getTotalCachedAmount ( ) const

Get total number of cached bytes.

Returns: a number of bytes

◆ getTotalMemory()

double wrench::MemoryManager::getTotalMemory ( )

Get total available cache memory.

Returns: a number of bytes

◆ initAndStart()

std::shared_ptr< MemoryManager > wrench::MemoryManager::initAndStart	(	wrench::Simulation *	simulation,
		simgrid::s4u::Disk *	memory,
		double	dirty_ratio,
		int	interval,
		int	expired_time,
		std::string	hostname
	)

static

Initialize and start the memory_manager_service manager.

Parameters

simulation
memory	disk model used to simulate memory_manager_service
dirty_ratio	dirty_ratio parameter as in the Linux kernel
interval	the interval that periodical flushing awakes in milliseconds
expired_time	the expired time of dirty data to be flushed in milliseconds
hostname	name of the host on which periodical flushing starts

Returns

◆ readChunkFromCache()

void wrench::MemoryManager::readChunkFromCache	(	std::string	filename,
		double	amount
	)

Simulate a read from cache, re-access and update cached file data.

Parameters

filename	name of the file read
amount	number of bytes

◆ readToCache()

simgrid::s4u::IoPtr wrench::MemoryManager::readToCache	(	std::string	filename,
		std::shared_ptr< FileLocation >	location,
		double	amount,
		bool	async
	)

Read data from disk to cache.

Parameters

filename	file name
location	file location
amount	number of bytes
async	tue if operation is asynchronous

Returns: a simgrid pointer to a pending I/O operation, or nullptr

◆ releaseMemory()

void wrench::MemoryManager::releaseMemory ( double released_amt )

Release memory.

Parameters

released_amt number of bytes to release

◆ setDirtyRatio()

void wrench::MemoryManager::setDirtyRatio ( double dirty_ratio )

Set the dirty ratio.

Parameters

dirty_ratio the dirty ratio

◆ setMemory()

void wrench::MemoryManager::setMemory ( simgrid::s4u::Disk * memory )

Set the memory disk.

Parameters

memory a disk that acts as the memory cache

◆ useAnonymousMemory()

void wrench::MemoryManager::useAnonymousMemory ( double used_amt )

Update the amount of used memory.

Parameters

used_amt number of bytes

◆ writebackToCache()

void wrench::MemoryManager::writebackToCache	(	std::string	filename,
		std::shared_ptr< FileLocation >	location,
		double	amount,
		bool	is_dirty
	)

Simulate a file write to cache.

Parameters

filename	name of the file written
location	file location
amount	amount of data written
is_dirty	true or false

The documentation for this class was generated from the following files:

MemoryManager.h
MemoryManager.cpp

Public Member Functions

Static Public Member Functions

Additional Inherited Members

Detailed Description

Member Function Documentation

◆ addToCache()

◆ evict()

◆ export_log()

◆ flush()

◆ getAvailableMemory()

◆ getCachedAmount()

◆ getCachedBlocks()

◆ getDirty()

◆ getDirtyRatio()

◆ getDisk()

◆ getEvictableMemory()

◆ getFreeMemory()

◆ getMemory()

◆ getTotalCachedAmount()

◆ getTotalMemory()

◆ initAndStart()

◆ readChunkFromCache()

◆ readToCache()

◆ releaseMemory()

◆ setDirtyRatio()

◆ setMemory()

◆ useAnonymousMemory()

◆ writebackToCache()