CRI Cray T3D

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CRI Cray T3D Supercomputer

Cray Research, Inc.
In use: July 1, 1994 - June 1, 1999
Production use
Peak teraflops: 0.02
Processors: 128
Clock speed: 0.15GHz
Memory (terabytes): 0.01TB
Electrical power consumption: 41.40 kW
Successor: IBM SP

The CRAY T3D at NCAR came online on July 1, 1994. It was a massively parallel processing (MPP) system that started out with 64 processors and was upgraded in 1997 to 128 processors.

The T3D was jointly funded by the High Performance Computing and Communications Program (HPCC) and the U.S. Global Change Research Program (USGRCP). Thus, the Climate Simulation Laboratory was responsible for the main usage of the T3D. However, some time was allocated on the T3D to projects that qualified as Grand Challenges under the HPCC program.

The T3D had 1,024 megawords (8 gigabytes) of memory and a clock period of 6.67 nanoseconds. It was tightly coupled to the CRAY C90 (Antero), making Antero's resources (I/O functionality, I/O subsystem, high-speed disks, HIPPI and FDDI network interfaces, and Mass Storage System connectivity) directly available to the T3D. Because the only I/O paths to it were from Antero, the T3D did not have its own system name.

The T3D ran the Cray UNICOS MAX operating system and supported Fortran 77, CRAFT (Cray Research Adaptive Fortran programming model), C, C++, and AS (Assembler). It offered utilities such as PVM (Parallel Virtual Machine), the TotalView Debugger, and the Apprentice performance tool. It also offered the mathematical and scientific libraries libm.a and libsci.a for MPP use.

The T3D was accessed by logging in to Antero or by submitting batch jobs to it from Antero. It was suited to jobs appropriate for an MPP system — i.e., parallel applications that were distributed among the processors efficiently and kept all processors busy with useful work most of the time.

While NCAR had discontinued maintenance on it in December 1998, SCD operated the Cray T3D until June 1, 1999.  It was removed from the NCAR Mesa Laboratory's machine room two days later to make room for the IBM SP RS/6000, Blackforest.

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