Machine type | Vectorprocessor |
---|---|

Models | S3600/120, S3600/140, S3600/160, S3600/180 |

Operating system | VOS3/HAP/ES (IBM MVS compatible) and OSF/1 |

Compilers | FORT77/HAP vectorising Fortran 77 |

**System parameters**:

Model | S3600/120 | S3600/140 | S3600/160 | S3600/180 |
---|---|---|---|---|

Clock cycle VPU | 4 ns | 4 ns | 4 ns | 4 ns |

Clock cycle scal. proc. | 8 ns | 8 ns | 8 ns | 8 ns |

Theor. peak performance | 0.25 Gflop/s | 0.5 Gflop/s | 1.0 Gflop/s | 2 Gflop/s |

Main memory | 128-256MB | 256-512MB | 256-512MB | 512-1024MB |

Extended memory | <=6GB | <=16GB | <=16GB | <=16GB |

**Remarks**:

The speed differences between the different models stem from replication of the multiply/add pipe in the models S3600/120-180. The /160 and /180 models have respectively two- and four-fold sets of a separate add- and a multifunctional multiply/add vector pipes. This should lead to a maximum of 3 results per clock cycle per pipe set. So, contrary to the information given by the vendor, the maximum performance of, e.g., the /180 should in some situations be 3 Gflop/s instead of 2.

Note that the clock cycle of the scalar processor is twice that of the VPU. The memory bandwidth from the memory from/to the CPU is 2 operands per clock cycle via 1 load and 1 load/store pipe per arithmetic pipe set), which is somewhat less than optimal. It is not possible to load two operands and store one result in one cycle. The /120 model lacks a separate load pipe, only a load/store pipe is present.

A unique feature of the S3600, as in its direct predecessor the S-820, is that all machines of the series are air cooled. All other machines in this class relied at least on water cooling.

Unlike the S-820 series, the S3600 series is also marketed worldwide, not only in Japan. This is also the case for the S3800 SM-MIMD machines (3.3.2).

**Measured performances**: In [#linpackbm#

Sat Feb 10 15:12:38 EST 1996