November 4, 2005

• IBM Blue Gene is the firstest parallel computer in the world that recorded 70 TFLOPS and overtook Earth simulator's 35 TFLOPS in 24th TOP500 ranking in November 2004. We ported ADVENTURECluster and tested on Blue Gene that consists of one rack 1024 nodes and 512GB memory, in colaboration with NIWS Corporation, Japan, in June 2005.

• ADVENTURECluster is scaled well and runs on 1024 nodes, 1024 CPUs even with small problems of like 5 million nodes, 15 million DOFs. Here we show a static analysis of a problem with 30 million nodes, 90 million DOFs.

  ADVENTURECluster has the CGCG solver, and the CGCG2 solver enhanced version of CGCG. The following table shows the results using these solvers. A problem with large as 90 million DOFs can be solved only in six or seven minutes.

  Solver	Nodes	Elapsed time	CPU time	Memory per node
  CGCG	1024	420 sec	249 sec	143 MB
  CGCG2	1024	342 sec	171 sec	156 MB

  In this analysis, the size of input and output file is about 2 GB and 11 GB, respectively. The output command executed simultaniously, that is, each 1024 MPI process carries out the output command at one time. The file system shows very high performance. The I/O rate looks rather high in this problem, but this is because the load of the calculation is rather low since the problem is simple static elastic analysis.

  

• There are lots of documents on Blue Gene in varios websites. Or, refer to:
  • Gara, A., et. al. Overview of the Blue Gene, IBM Research and Development Journal., Vol. 49, No. 2/3, 2005.

if you have any questions.