Event

Title:  Simulation of Generalized Contagion Dynamics
Speaker:  Sherif Abdelhamid
Abstract: We present EDISON, a web-based distributed application for performing contagion dynamics studies on networked systems. EDISON is publicly accessible by scientists and domain experts interested in carrying out in-silico social-, technical-,  and infrastructure-based experiments. 

EDISON has a unique feature set, (i) experiments can be carried out at scale (networked populations up to millions of nodes and edges), (ii) web-based, easy to use user interface (designed for non-computer experts), also promotes collaboration, (iii) powered with digital library services and repository, (iv) use of high performance computing.

Title: Parallel Algorithms for Generating Random Networks with Given Degree Sequences
Speaker: Maksudul Alam
Abstract: Random networks are widely used for modeling and analyzing complex processes. Many mathematical models have been proposed to capture diverse real-world networks. One of the most important aspects of these models is degree distribution. Chung--Lu (CL) model is a random network model, which can produce networks with any given arbitrary degree distribution. The complex systems we deal with nowadays are growing larger and more diverse than ever. Generating random networks with any given degree distribution consisting of billions of nodes and edges or more has become a necessity, which requires efficient and parallel algorithms.

We present an MPI-based distributed memory parallel algorithm for generating massive random networks using CL model, which takes O((m+n)/P+P) time with high probability and O(n) space per processor, where n, m, and P are the number of nodes, edges and processors, respectively. The time efficiency is achieved by using a novel load-balancing algorithm. Our algorithms scale very well to a large number of processors and can generate massive power{law networks with one billion nodes and 250 billion edges in one minute using 1024 processors.

Webex Meeting Number: 310 969 696

Event Contact:
Yihui Ren