wrench::SimpleStorageService Class Reference

A storage service that provides direct access to some storage resources (e.g., one or more disks). An important (configurable) property of the storage service is SimpleStorageServiceProperty::BUFFER_SIZE (see documentation thereof), which defines the buffer size that the storage service uses. More specifically, when the storage service receives / sends data from / to the network, it does so in a loop over data "chunks", with pipelined network and disk I/O operations. The smaller the buffer size the more "fluid" the model, but the more time-consuming the simulation. A large buffer size, however, may lead to less realistic simulations. At the extreme, an infinite buffer size would correspond to fully sequential executions (first a network receive/send, and then a disk write/read). Setting the buffer size to "0" corresponds to a fully fluid model in which individual data chunk operations are not simulated, thus achieving both accuracy (unless one specifically wishes to study the effects of buffering) and quick simulation times. For now, setting the buffer size to "0" is not implemented. The default buffer size is 1 MiB (note that the user can always declare a disk with arbitrary bandwidth in the platform description XML). More...

#include <SimpleStorageService.h>

Inheritance diagram for wrench::SimpleStorageService:
wrench::StorageService wrench::Service

Public Member Functions

 SimpleStorageService (std::string hostname, std::set< std::string > mount_points, std::map< std::string, std::string > property_list={}, std::map< std::string, double > messagepayload_list={})
 Public constructor. More...
 

Detailed Description

A storage service that provides direct access to some storage resources (e.g., one or more disks). An important (configurable) property of the storage service is SimpleStorageServiceProperty::BUFFER_SIZE (see documentation thereof), which defines the buffer size that the storage service uses. More specifically, when the storage service receives / sends data from / to the network, it does so in a loop over data "chunks", with pipelined network and disk I/O operations. The smaller the buffer size the more "fluid" the model, but the more time-consuming the simulation. A large buffer size, however, may lead to less realistic simulations. At the extreme, an infinite buffer size would correspond to fully sequential executions (first a network receive/send, and then a disk write/read). Setting the buffer size to "0" corresponds to a fully fluid model in which individual data chunk operations are not simulated, thus achieving both accuracy (unless one specifically wishes to study the effects of buffering) and quick simulation times. For now, setting the buffer size to "0" is not implemented. The default buffer size is 1 MiB (note that the user can always declare a disk with arbitrary bandwidth in the platform description XML).

Constructor & Destructor Documentation

◆ SimpleStorageService()

wrench::SimpleStorageService::SimpleStorageService ( std::string  hostname,
std::set< std::string >  mount_points,
std::map< std::string, std::string >  property_list = {},
std::map< std::string, double >  messagepayload_list = {} 
)

Public constructor.

Parameters
hostnamethe name of the host on which to start the service
mount_pointsthe set of mount points
property_lista property list ({} means "use all defaults")
messagepayload_lista message payload list ({} means "use all defaults")

The documentation for this class was generated from the following files:
  • /home/wrench/wrench/include/wrench/services/storage/simple/SimpleStorageService.h
  • /home/wrench/wrench/src/wrench/services/storage/simple/SimpleStorageService.cpp