A fast vectorized program for the cyber 205 to calculate the partition function of the 3-D Ising model

Abstract I describe a computer program that numerically estimates the density of states of the three-dimensional Ising model. The program runs at a speed of 110 million spin updates per second on a 2 pipe CDC Cyber 205 and 233 million updates per second on an ETA-10. Title of program: MICRO Catalogue Id: ABHR_v1_0 Nature of problem The density of states for each energy is estimated by finding the relative frequencies of each energy using a microcanonical approach. Versions of this program held in the CPC repository in Mendeley Data ABHR_v1_0; MICRO; 10.1016/0010-4655(89)90036-2 This program has been imported from the CPC Program Library held at Queen's University Belfast (1969-2019)**摘要**：本文介绍一款可数值估算三维伊辛模型（Ising model）态密度（density of states）的计算机程序。该程序在双流水线CDC Cyber 205计算机上的运行速度可达每秒1.1亿次自旋更新，在ETA-10计算机上则可达每秒2.33亿次自旋更新。 程序名称：MICRO 目录编号：ABHR_v1_0 **问题描述**：本程序通过微正则方法（microcanonical approach）统计各能量的相对频率，以此估算各能量对应的态密度。 Mendeley数据集中CPC库收录的本程序版本：ABHR_v1_0; MICRO; 10.1016/0010-4655(89)90036-2 本程序源自贝尔法斯特女王大学托管的CPC程序库（1969-2019年）