We describe APEmille, the latest generation of the APE parallel processors. This machine, an evolution of the APE100 concept, is very efficient for LGT simulations as well as for a broader class of applications requiring massive floating point computations. Several new features characterise this evolution. In particular local addressing capabilities are added to all computing nodes. APEmille also exhibits a higher degree of integration with a network of workstations acting as a global host system. An APEmille system in the Teraflops range will be completed in three-four years. The architecture proposed in this paper is being currently simulated and evaluated.

We present numerical results obtained in full QCD with 2 flavors of Wilson fermions. We discuss the relation between the phase of Polyakov loops and the sea quarks boundary conditions. We report preliminary results about the HMC autocorrelation of the hadronic masses, on a 16(3) x 32 lattice volume, at beta = 5.55 with kappa(sea) = 0.1570.

The polarization of Polyakov type loops is responsible for the difference between quenched and unquenched finite size effects on the QCD mass spectrum. With a numerical simulation, using different sea quarks boundary conditions, we show that we can align the spatial Polyakov loops in a predefined direction. Starting from these results, we propose a procedure to partially remove the Polyakov type contributions in the meson propagators.

We present the first tests and results from a study of QCD with two flavours of dynamical Wilson fermions using the Hybrid Monte Carlo Algorithm (HMCA) on APE100 machines. The simulations have been performed on 64 lattice for the pure gauge HMCA and on 84, 123×32 lattices for full QCD configurations. We discuss the inversion algorithm for the fermionic operator, the methods used to overcome the problems arising using a 32 bit machine and the implementation of a new random number generator for APE100 machines. We propose different scenarios for the simulation of physical observables, with respect to the memory capacity and speed of different APE100 configurations.

This document represents the effort of several physicists, presently engagedin numerical simulations on computers of the APE100 family. The documentintends to present a wide spectrum of projects, that will become possible withthe realization of a parallel computer in the one TeraFlops range. Basedon previous experience, several common demands have emerged. Besidescomputer power, good performances can be achieved if the new machine willhave:1. a compact structure, with a small number of...

The poster reported the status of the APE100 project and the results of a first full QCD simulation performed on a 6 Gflops APE100 machine using the Hybrid Monte Carlo algorithm for 2 flavours Wilson fermions.