\noindent
{\bf
CRAY Y-MP
}



\noindent
{\bf
Vector Register, Parallel, Shared-Memory Architecture
}

\vspace {.1in}
\noindent
{\bf Architecture:}
This is a multiprocessor pipelined vector machine.  It has
a similar architecture to the CRAY X-MP. A major difference is
the availability of 32- as well as 24-bit addressing. The cycle
time is 6 nsec, and it is an 8 processor machine. As in the X-MP
there are three paths from memory to the vector
registers.

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\noindent
There are only three module types, for the CPU (8 modules),
the memory (32 modules, with 1 Mword/module),
and the clock (1 module), making 41
modules in all compared with 144 in the X-MP. Each
module is on an 11" by 21.2" board.
2.5 $\mu$ ECL in 2500 gate arrays with gate delay of 350 picoseconds.
There are 312 arrays per processor on four PCBs with a power
dissipation of 9 Watts per array.

\vspace {.1in}
\noindent
The processors
share a common memory of 32 Mword in bipolar SRAM with a 15 nsec
access time and a bank busy time of 102 nsec.
Memory is interleaved in 256 banks.
Total bandwidth is 340 Gbytes/sec (32 words/CP per processor).
The Y-MP comes with a
128 Mword SSD as a standard feature. 2 IOSs can be fitted, each with
a 4 Mword buffer memory.

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\noindent
{\bf Configuration:}
There are many possible front ends including IBM, CDC, VAX, and Apollo.
There are four VHISP channels each rated at 1250 Mbytes/sec, eight 100
Mbytes/sec HISP channels, and eight LOSP 6 Mbytes/sec channels.
A full range of disks, tapes, terminals, workstations, and networks
(including TCP/IP) are supported.

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\noindent
Cooled using inert fluorocarbon but not with liquid immersion
technology (as on CRAY-2).

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\noindent
The dimensions of the machine are 77" x 30" x 75" with a total
footprint of 98 sq ft and weighing 5,000 lb.

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\noindent
{\bf Software:}
COS and UNICOS are both supported.  In addition to CFT77 a new Fortran
compiler will be available. Performance tools include dynamic and
static analysis, tuning, and debugging aids.
Can run in X or Y mode, and software can also run (in X mode) on the
X-MP.

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\noindent
{\bf Performance:}
Peak performance of 4 Gflops. Overall performance of about
30 times a CRAY-1.  Each processor should outperform a
single X-MP processor by a factor of 1.4 in vector mode (1.2 in scalar).

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\noindent
{\bf Status:}
1 CPU running in 1987;
first deliveries in 1988; nine deliveries in 1989; full production
and possible enhancements in 1990.

\noindent
Cost: Around \$25M for a fully configured machine.

\noindent
{\bf Contact:}

\begin{flushleft}
Cray Research Inc.\\
1440 Northland Drive\\
Mendota Heights, MN 55120\\
612-452-6650\\
\vspace{.1in}
Les Davis\\
1100 Lowater Rd.\\
Cray Research Inc.\\
Chippewa Falls, Wisconsin 54701\\
715-726-1211\\
\end{flushleft}

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