wrench::Simulation

class Simulation

A class that provides basic simulation methods. Once the simulation object has been explicitly or implicitly destroyed, then any call to the WRENCH APIs has undefied behavior (due to memory_manager_service being de-allocated).

Public Functions

~Simulation(): Destructor.

template<class T> inline std::shared_ptr<T> add(std::shared_ptr<T> t)

Method to add a service to the simulation.

Template Parameters:: T – The service class (base class is Service)
Parameters:: t – the service object (shared ptr)
Returns:: a shared_ptr to the service object

template<class T> inline std::shared_ptr<T> add(T *t)

Method to add a service to the simulation.

Template Parameters:: T – The service class (base class is Service)
Parameters:: t – the service object
Returns:: a shared_ptr to the service object

double getEnergyConsumed(const std::string &hostname)

Obtains the current energy consumption of a host.

Parameters:: hostname – the host name
Returns:: current energy consumption in joules

double getEnergyConsumed(const std::string &hostname, bool record_as_time_stamp)

Obtains the current energy consumption of a host and will add SimulationTimestampEnergyConsumption to simulation output if can_record is set to true.

Parameters:

hostname – the host name
record_as_time_stamp – bool signaling whether or not to record a SimulationTimestampEnergyConsumption object

Returns:

current energy consumption in joules

std::map<std::string, double> getEnergyConsumed(const std::vector<std::string> &hostnames)

Obtains the current energy consumption of a host.

Parameters:: hostnames – the list of hostnames
Returns:: current energy consumption in joules for each host, as a map indexed by hostnames

std::map<std::string, double> getEnergyConsumed(const std::vector<std::string> &hostnames, bool record_as_time_stamps)

Obtains the current energy consumption of a host and will add SimulationTimestampEnergyConsumption to simulation output if can_record is set to true.

Parameters:

hostnames – the list of hostnames
record_as_time_stamps – whether or not to record a SimulationTimestampEnergyConsumption object for each host when this method is called

Returns:

current energy consumption in joules for each host, as a map indexed by hostnames

double getLinkUsage(const std::string &link_name, bool record_as_time_stamp)

Obtains the current link bandwidth usage on a link and will add SimulationTimestampLinkUsage to simulation output if record_as_time_stamp is set to true.

Parameters:

link_name – the link’s name
record_as_time_stamp – bool signaling whether or not to record a SimulationTimestampLinkUsage object

Returns:

current bandwidth usage in Bps

SimulationOutput &getOutput()

Get the simulation output object.

Returns:: simulation output object

void init(int*, char**)

Initialize the simulation, which parses out WRENCH-specific and SimGrid-specific command-line arguments, if any.

Parameters:

argc – main()’s argument count
argv – main()’s argument list

void instantiatePlatform(const std::function<void()>&)

Instantiate a simulated platform.

Parameters:: creation_function – void() function to create the platform

void instantiatePlatform(const std::string&)

Instantiate a simulated platform.

Parameters:: filename – the path to a SimGrid XML platform description file

void instantiatePlatformFromString(const std::string &platform)

Instantiate a simulated platform.

Parameters:: platform – the string representation of a SimGrid XML platform description

bool isRunning() const

Checks whether the simulation is running or not.

Returns:: true or false

void launch(): Launch the simulation.

void readFromDisk(sg_size_t num_bytes, const std::string &hostname, simgrid::s4u::Disk *disk)

Wrapper enabling timestamps for disk reads.

Parameters:

num_bytes – number of bytes read
hostname – hostname to read from
disk – disk to read from (nullptr if not known)

void readFromDiskAndWriteToDiskConcurrently(sg_size_t num_bytes_to_read, sg_size_t num_bytes_to_write, const std::string &hostname, simgrid::s4u::Disk *src_disk, simgrid::s4u::Disk *dst_disk)

Wrapper enabling timestamps for concurrent disk read/writes.

Parameters:

num_bytes_to_read – - number of bytes read
num_bytes_to_write – - number of bytes written
hostname – - hostname where disk is located
src_disk – source disk (nullptr if not known)
dst_disk – dst disk (nullptr if not known)

void setPstate(const std::string &hostname, int pstate)

Set the power state of the host.

Parameters:

hostname – the host name
pstate – the power state index (as specified in the platform xml description file)

std::shared_ptr<ComputeService> startNewService(ComputeService *service)

Starts a new compute service during execution (i.e., one that was not passed to Simulation::add() before Simulation::launch() was called). The simulation takes ownership of the reference and will call the destructor.

Parameters:: service – An instance of a service
Returns:: A pointer to the service instance

std::shared_ptr<FileRegistryService> startNewService(FileRegistryService *service)

Starts a new file registry service during execution (i.e., one that was not passed to Simulation::add() before Simulation::launch() was called). The simulation takes ownership of the reference and will call the destructor.

Parameters:: service – An instance of a service
Returns:: A pointer to the service instance

std::shared_ptr<NetworkProximityService> startNewService(NetworkProximityService *service)

Starts a new network proximity service during execution (i.e., one that was not passed to Simulation::add() before Simulation::launch() was called). The simulation takes ownership of the reference and will call the destructor.

Parameters:: service – An instance of a service
Returns:: A pointer to the service instance

std::shared_ptr<StorageService> startNewService(StorageService *service)

Starts a new storage service during execution (i.e., one that was not passed to Simulation::add() before Simulation::launch() was called). The simulation takes ownership of the reference and will call the destructor.

Parameters:: service – An instance of a service
Returns:: A pointer to the service instance

void writeToDisk(sg_size_t num_bytes, const std::string &hostname, simgrid::s4u::Disk *disk)

Wrapper enabling timestamps for disk writes.

Parameters:

num_bytes – number of bytes written
hostname – name of the host to write to
disk – a simgrid disk to write to (nullptr if not known)

Public Static Functions

static std::shared_ptr<DataFile> addFile(const std::string &id, const std::string &size)

Add a new file to the simulation (use at your own peril if you’re using the workflow API - use Workflow::addFile() instead)

Parameters:

id – a unique string id
size – a size as a unit string (e.g., “10MB”)

Returns:

the DataFile instance

static std::shared_ptr<DataFile> addFile(const std::string &id, sg_size_t size)

Add a new file to the simulation (use at your own peril if you’re using the workflow API - use Workflow::addFile() instead)

Parameters:

id – a unique string id
size – a file size in bytes

Returns:

the DataFile instance

static void compute(double flops)

Make the calling process compute.

Parameters:: flops – a number of floating point operations

static void computeMultiThreaded(unsigned long num_threads, double thread_creation_overhead, double sequential_work, double parallel_per_thread_work)

Simulates a multi-threaded computation.

Parameters:

num_threads – the number of threads
thread_creation_overhead – the thread creation overhead in seconds
sequential_work – the sequential work (in flops)
parallel_per_thread_work – the parallel per thread work (in flops)

static void createNewDisk(const std::string &hostname, const std::string &disk_id, double read_bandwidth_in_bytes_per_sec, double write_bandwidth_in_bytes_per_sec, sg_size_t capacity_in_bytes, const std::string &mount_point)

Method to create a new disk in the platform, which can be handy.

Parameters:

hostname – the name of the host to which the disk should be attached
disk_id – the nae of the disk
read_bandwidth_in_bytes_per_sec – the disk’s read bandwidth in byte/sec
write_bandwidth_in_bytes_per_sec – the disk’s write bandwidth in byte/sec
capacity_in_bytes – the disk’s capacity in bytes
mount_point – the disk’s mount point (most people use “/”)

static std::shared_ptr<Simulation> createSimulation()

Create a simulation.

Returns:: a simulation

static bool doesHostExist(const std::string &hostname)

Wrapper for S4U_Simulation hostExists()

Parameters:: hostname – - name of host being queried
Returns:: boolean of existence

static bool doesLinkExist(const std::string &link_name)

Wrapper for S4U_Simulation linkExists()

Parameters:: link_name – - name of link being queried
Returns:: boolean of existence

static int getCurrentPstate(const std::string &hostname)

Get the current power state of a host.

Parameters:: hostname – the host name
Returns:: The index of the current pstate of the host (as specified in the platform xml description file)

static double getCurrentSimulatedDate()

Get the current simulated date.

Returns:: a date

static std::shared_ptr<DataFile> getFileByID(const std::string &id)

Find a DataFile based on its ID.

Parameters:: id – a string id
Returns:: the DataFile instance (or throws a std::invalid_argument if not found)

static std::shared_ptr<DataFile> getFileByIDOrNull(const std::string &id)

Find a DataFile based on its ID.

Parameters:: id – a string id
Returns:: the DataFile instance (or nullptr if not found)

static std::map<std::string, std::shared_ptr<DataFile>> &getFileMap()

Get the list of all files in the simulation.

Returns:: a reference to the map of files in the simulation, indexed by file ID

static double getFlopRate()

Get the flop rate of one core of the host on which the calling process is running.

Returns:: a flop rate

static double getHostFlopRate(const std::string &hostname)

Get the flop rate of one core of a host given a hostname.

Parameters:: hostname – the hostname
Returns:: a flop rate (flop / sec)

static sg_size_t getHostMemoryCapacity(const std::string &hostname)

Get the memory_manager_service capacity of a host given a hostname.

Parameters:: hostname – the hostname
Returns:: a memory_manager_service capacity in bytes

static std::string getHostName()

Get the name of the host on which the calling process is running.

Returns:: a host name

static std::vector<std::string> getHostnameList()

Get the list of names of all the physical hosts in the platform.

Returns:: a vector of hostnames

static std::map<std::string, std::vector<std::string>> getHostnameListByCluster()

**

Get the list of names of all the hosts in each cluster composing the platform

Returns:: a map of lists of hosts, indexed by cluster name

static unsigned long getHostNumCores(const std::string &hostname)

Get the number of cores of a host given a hostname.

Parameters:: hostname – the hostname
Returns:: a number of cores

static double getLinkBandwidth(const std::string &link_name)

Get the max bandwidth of a particular link.

Parameters:: link_name – the link’s name
Returns:: a bandwidth in Bps

static std::vector<std::string> getLinknameList()

Get the list of names of all the links in the platform.

Returns:: a vector of link names

static double getLinkUsage(const std::string &link_name)

Get the current usage of a particular link.

Parameters:: link_name – the link’s name
Returns:: a bandwidth usage

static std::vector<int> getListOfPstates(const std::string &hostname)

Get the list of power states available for a host.

Parameters:: hostname – the host name
Returns:: a list of power states available for the host (as specified in the platform xml description file)

static double getMaxPowerConsumption(const std::string &hostname)

Get the maximum power consumption for the host (i.e., 100% utilization) at its current pstate.

Parameters:: hostname – the host name
Returns:: The “100% used” power consumption (as specified in the platform xml description file)

static sg_size_t getMemoryCapacity()

Get the memory_manager_service capacity of the host on which the calling process is running.

Returns:: a memory_manager_service capacity in bytes

static double getMinPowerConsumption(const std::string &hostname)

Get the minimum power consumption for the host (i.e., idling) at its current pstate.

Parameters:: hostname – the host name
Returns:: The “idling” power consumption (as specified in the platform xml description file)

static int getNumberOfPstates(const std::string &hostname)

Get the total number of power states of a host.

Parameters:: hostname – the host name
Returns:: The number of power states available for the host (as specified in the platform xml description file)

static unsigned long getNumCores()

Get the number of cores of the host on which the calling process is running.

Returns:: a number of cores

static std::vector<std::string> getRoute(std::string &src_host, std::string &dst_host)

Get the list of link names on the route between two hosts.

Parameters:

src_host – src hostname
dst_host – dst hostname

Returns:

a vector of link names

static bool hostHasMountPoint(const std::string &hostname, const std::string &scratch_space_mount_point)

Determine if a host has a disk mounted at some mount point.

Parameters:

hostname – the hostname
mount_point – the mount point

Returns:

true or false

static bool isEnergySimulationEnabled()

Method to check if energy simulation is activated.

Returns:: true or false

static bool isHostOn(const std::string &hostname)

Returns whether a host is on or not.

Parameters:: hostname – the hostname
Returns:: true or false

static bool isHostShutdownSimulationEnabled()

Method to check if host shutdown simulation is activated.

Returns:: true or false

static bool isInitialized()

Determine if the simulation has been initialized.

Returns:: true or false

static bool isLinkOn(const std::string &link_name)

Returns whether a link is on or not.

Parameters:: link_name – the link_name
Returns:: true or false

static bool isLinkShutdownSimulationEnabled()

Method to check if link shutdown simulation is activated.

Returns:: true or false

static bool isPageCachingEnabled()

Method to check if page caching is activated.

Returns:: true or false

static bool isSurfPrecisionSetByUser()

Method to check if surf precision was set by the user.

Returns:: true or false

static void removeAllFiles(): Remove all files from the simulation (use at your own peril if you’re using the workflow API)

static void removeFile(const std::shared_ptr<DataFile> &file)

Remove a file from the simulation (use at your own peril if you’re using the workflow API - use Workflow::removeFile() instead)

Parameters:: file – : file to remove

static void sleep(double duration)

Make the calling process sleep for a number of (simulated) seconds.

Parameters:: duration – a number of seconds

static void turnOffHost(const std::string &hostname)

Turns off a host.

Parameters:: hostname – the hostname

static void turnOffLink(const std::string &link_name)

Turns off a link.

Parameters:: link_name – the link_name

static void turnOnHost(const std::string &hostname)

Turns on a host.

Parameters:: hostname – the hostname

static void turnOnLink(const std::string &link_name)

Turns on a link.

Parameters:: link_name – the link_name