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INVERTASTIC README ================== ----------------- Copyright 2016 The University of Edinburgh Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. ----------------- About ----------------- Invertastic is a utility for performing large-scale dense SPD matrix inversions on parallel computers. For full details, please see A. Gray, "Invertastic: Large-scale Dense Matrix Inversion", ARCHER Whitepaper available at www.archer.ac.uk/documentation/white-papers/ This software is openly available as a central package on the UK ARCHER national supercomputing facility at /work/y07/y07/itastic Options ---------------- Invertastic accepts the following arguments: --size <N> specify size N for NxN square matrix to be inverted [--check] if specified, the code will multiply the original matrix by the resulting inverse, compare this product (element-wise) with the expected identity matrix, and print the maximum deviation. [--input <full path to input file>] if specified, the code will read the input matrix from the specified file. The format should be binary with NxN 8-byte (double precision) entries and no headers. If not specified to allow performance benchmarking and testing the code will create an SPD matrix on-the-fly using random numbers. [--output <full path to output file>] if specified, the code will write the binary output matrix to the specified file. The format will be binary with NxN 8-byte (double precision) entries and no headers. Compilation ---------------- Invertastic depends on MPI, PBLAS, BLACS, and ScaLAPACK libraries. The Makefile is currently configured for the ARCHER UK national supercomputing facility, using Intel MKL. To compile on ARCHER: module swap PrgEnv-cray PrgEnv-intel cd src make clean make To configure for other machines, the Makefile should be edited to specify the appropriate paths. Execution --------------- This distribution contains a sample job script, run_archer.sh, for running invertastic on ARCHER using the PBS job submission system.