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发信人: carl.bbs@bbs.swjtu.edu.cn (师哥), 信区: cnunix
标  题: 曙光1000 知识讲座（五）
发信站: 锦城驿站 (Sat Dec  6 20:43:34 1997)
转信站: Lilac!ustcnews!ustcnews!sjtunews!swjtu!swjtubbs
出  处: xnjd21.swjtu.edu.cn

曙光1000 硬件（2）

  3.4 System Service Nodes

        The system service nodes are provided for managing the system resources
(especially the node processors). A service node is a 50 MHZ 486 PC with a EISA
bus. There is a EISA-Mesh interface module (EMI) between the EISA bus and the
mesh network. There is DMA mechanism on the EMI card, which is a EISA plug-in
card. The data path FIFO-Mesh-FIFO has CRC check. The communication speed
between the EMI card and the mesh is 16 MB/s. When there are a lot of users
and a lot of graphic displaying, two service nodes can be provided, and they
can work coordinately by shareing a system resource table.

3.5 I/O nodes

        An I/O node is a 486 PC with a EISA bus, as the same as the service
nodes, and has a EMI plug-in card. An I/O node can be connected to a 4 GB
harddisk by a SCSI card pluged on the EISA bus. The system can have one or two
I/O nodes. User who require large I/O throughputs can have more I/O nodes, but
the number of computing nodes must be reduced correspondingly. The data
transfering speed between an I/O node and the mesh network is 16 MB/s. Each I/O
node runs a parallel file system, and performs parallel file operations.

3.6 System Console

        There is a system console for the whole system, which runs UNIX. The
console has a multi-user card, which is connected to the RS232 serial ports of
the 32 computing node boards. The console can perform point-to-point
communication with any computing node, and also can broadcast messages to all
computing nodes simultaneously. Its main fuctions are initializing the system,
supervising the running of the operating system and user programs on the
computing nodes, dinamically looking up the node processor resource
configuration table and diagnosing the hardware failures of the computing
nodes.

3.7 Network of the Front-End Computers

        The working platforms for users of Dawning-1000 are one or more SUN
Sparc-II colored graphical workstations (or SGI graphical workstations), and
some terminals. All these devices are connected to the system service nodes by
a LAN (Ethernet or WAN). The LAN obeys TCP/IP protocol, and its data
transfering speed is 10 Mb/s. In fact, the mesh system can be considered as a
computing server for the front-end network system. User programs are edited,
compiled, linked and debugged on the front-end computers, and then are sent to
the compuing nodes by the service nodes, and the computing results are
displayed by the front-end computers.

--

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