Free high speed internet software for linux

HPL is a software package that solves a (random) dense linear system in double precision (64 bits) arithmetic on distributed-memory computers. It can thus be regarded as a portable as well as freely available implementation of the High Performance Computing Linpack Benchmark.

The algorithm used by HPL can be summarized by the following keywords: Two-dimensional block-cyclic data distribution - Right-looking variant of the LU factorization with row partial pivoting featuring multiple look-ahead depths - Recursive panel factorization with pivot search and column broadcast combined - Various virtual panel broadcast topologies - bandwidth reducing swap-broadcast algorithm - backward substitution with look-ahead of depth 1.

The HPL package provides a testing and timing program to quantify the accuracy of the obtained solution as well as the time it took to compute it. The best performance achievable by this software on your system depends on a large variety of factors.

Nonetheless, with some restrictive assumptions on the interconnection network, the algorithm described here and its attached implementation are scalable in the sense that their parallel efficiency is maintained constant with respect to the per processor memory usage.

The HPL software package requires the availibility on your system of an implementation of the Message Passing Interface MPI (1.1 compliant). An implementation of either the Basic Linear Algebra Subprograms BLAS or the Vector Signal Image Processing Library VSIPL is also needed. Machine-specific as well as generic implementations of MPI, the BLAS and VSIPL are available for a large variety of systems.

High Level Virtual Machine is a toolkit for developing virtual machines for dynamic languages.
The High Level Virtual Machine is:
- Based on LLVM (Low Level Virtual Machine). LLVM is HLVMs sister project. HLVM gains tremendous capability from LLVM in the areas of code generation, bytecode storage, runtime execution, etc.
- Aimed at supporting dynamic languages such as Ruby, Python, Perl, Jython, Haskell, Prolog, etc.
- A complete compiler developers toolkit for creating new languages easily. To write a new compiler, language designers simply write a plugin that describes the language to HLVM and how to translate the grammar productions into HLVMs comprehensive Abstract Syntax Tree (AST). After that, HLVM handles all aspects of code generation, bytecode storage, XML translation, JIT execution or interpretation, and native compilation.
- A language interoperability framework. Because all front end compilers generate code in the same AST, they can interoperate. Use of the runtime library for common constructs (e.g. "string") allow even complex data types to be shared between languages. Users of HLVM can write complex programs in multiple languages and be assured the result can be executed efficiently.
- A code management system including code revisioning, interface versioning, automated recompilation, separation of workspaces, etc.
- Currently under development. Project started April 20th, 2006. Stay tuned to this web site for future developments.