Year: 2026
Type: article
Abstract: We ported a tomographic reconstruction code from MPI to OpenMP (formally, the software systems Message Passing Interface and Open Multi-Processing). Due to randomness associated with the order of floating point operations, we found that verifying the correctness of the port required a statistical comparison of the answers. These agree within acceptable bounds. As a function of iteration number, the solutions generated with different numbers of cores at first diverge, then converge. We also studied the effect of having different random number starts. In this case, the answers always converge toward each other, although their variation is greater than the variation associated with changing the number of cores with a fixed random number seed.
Authors: Zachary H. Levine, Collin Guan
Institution: National Institute of Standards and Technology
Language: English
Subfield: Hardware and Architecture
Field: Computer Science
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $2,990
OpenAlex ID: W7166547283