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Architecture

Figure 1 presents an overview of the components that compose the architecture of CSGrid. The CSGrid Server (Central Server) is accessible to users through a browser. In order to execute the programs (refered to as Algorithms), another type of service is needed, which is called SGA. The SGA is responsible for monitoring execution hosts and for the execution of algorithms on such resources. The CSGrid Server is a Java application running on background (i.e. a daemon), which communicates with SGAs, through CORBA. Each user can execute a CSGrid Client through a browser. The client is also implemented in Java and communicates with the server through RMI.

Figure 1: CSGrid Architecture

The Data Repository shall provide enough space for the storage of:

  • user projects areas
  • executables of the algorithms
  • control structures (user idenfications, permissions, etc)

Concerning CSGrid server, some of the relevant factors for dimensioning of computing resources are:

  • number of users (current and projected).
  • average number of simultaneous accesses (current and projected)
  • average usage of disk space
  • availability requirements (e.g. 24x7 availabilidy implies the redundance of some nodes, configuration of RAID for storage, etc).

Components Features

Table 1 show the profile of each component regarding the usage o memory, CPU, disk space and network. The definition of the terms, high, average and low, are dependent of the context,so Table 2 can be used as reference.

Remarks:

  • An Intel processor with hyper-threading technology is counted as 2 CPUs.
  • Availability and fail tolerance requirements demand multiple disks for redundance (RAID).

component

memory

CPU

disk

network

CSGrid Server

high

average

low

high

Repositório de Dados

average

average

high

high

Servidores de Execução (SGA)

high

high

low

high

Table 1: Tipical usage of hardware resources

profile

memory

CPU

disk

network

high

≥ 4GB

servers (Intel, Sun, IBM etc.) with 4 CPUs or more

≥ 120GB (SCSI)

1 Gigabit dedicated dedicated fiber channel
100Mbps

average

1GB

CPU Dual Core

80GB (IDE)

100Mbps

low

512MBv

Pentium4 (1 CPU)

40GB (IDE)

100Mbps

Table 2: Reference for hardware requirements

All the components can be installed in a single machine, however, the tipical usage consists of:

  • a node for the CSGrid server
  • a node for the Data Repository
  • one or more SGAs

Since the CSGrid server is developed in Java, it is portable to be executed in any operating system, such as Linux, Solaris, AIX and MS Windows. Table 3 exemplifies the recommended setup.

component

operating system

CSGrid Server

UNIX (Linux / Solaris / AIX)

Data Repository

UNIX (Linux / Solaris / AIX),
compartilhamento de arquivos via NFS

SGAs

MS Windows
UNIX (Linux / Solaris / AIX)

Table 3: Operating Systems

Scalability

The execution servers (SGAs) can and normally are hosted in multiple servers (which can use different operating systems and hardware configurations). In order to make the system aware of new servers it is only necessary to update configuration files. In the case of the Data Repository, normally the changes are completely seamless to the system.

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