SimpleStorage

Table of Contents

• Overview
• Creating a Simple storage service

User Documentation

Other: Developer - Internal

Overview

A Simple storage service is the simplest possible abstraction for a service that can store and provide workflow files. It has a certain storage capacity, and provides write, read, and delete operations on files. Writes and Reads can be done synchronously or asynchronously. In addition, higher-level semantics such as copying a file directly from a storage service to another are provided.

Creating a Simple storage service

In WRENCH, a Simple storage service represents a storage service (wrench::StorageService), which is defined by the wrench::SimpleStorage class. An instantiation of a Simple storage service requires the following parameters:

• The name of a host on which to start the service (this is the entry point to the service);
• A capacity in bytes;
• Maps (std::map) of configurable properties (wrench::BatchServiceProperty) and configurable message payloads (wrench::BatchServiceMessagePayload).

The example below shows how to create an instance of a Simple storage service that runs on host "Gateway", has access to 64TiB of storage. Furthermore, the number of maximum concurrent data connections supported by the service is configured to be 8:

auto storage_service = simulation->add(
          new wrench::SimpleStorageService("Gateway", 
                                  pow(2,46),
                                       {{wrench::SimpleStorageProperty::MAX_NUM_CONCURRENT_DATA_CONNECTIONS, "8"}}
                                      );