Influence of external memory features of supercomputers on parallel programs execution

The article considers usage of external memory in supercomputers. Methods of analysis of program interaction with memory hierarchy are described. The article provides a technique to study the profiles of parallel programs with external memory supercomputer interaction. The technique is based on the use of the Ganglia open source resource monitoring software and logs of the SUPPZ batch system. The developed technique was used for collection and analysis of JSCC users' jobs profiles. The applications were chosen to illustrate the variety of input–output patterns in the user's job. The article presents the results of studying users' programs profiles, which were collected on the MVS-100K supercomputer installed in JSCC RAS. Program classification based on the patterns of interaction with external memory is considered, statistics are presented. The key problems of using the external memory supercomputer system are described.