International Business Machines Corporation

Wen Chong Chen

Zhi Zhang

Hanhong Xue

Tsai-Yang Jea

Hung Q Thai

Wiliam P LePera

A method, apparatus and program product utilize an empirical approach to determine the locations of one or more IO adapters in an HPC environment. Performance tests may be run using a plurality of candidate mappings that map IO adapters to various locations in the HPC environment, and based upon the results of such testing, speculative adapter affinity information may be generated that assigns one or more IO adapters to one or more locations to optimize adapter affinity performance for subsequently-executed tasks.

Empirical determination of adapter affinity in high performance computing (HPC) environment

Smooth release of resources on a switch node adapter to a diagnostics program is provided without requiring rebooting of the system. The release technique includes: setting a first flag at a device driver associated with the adapter to block new open system calls from opening the device driver; broadcasting an adapter down event to instruct internet protocol (IP), fault service daemon (FSD) and application program interface (API) components of the node to release resources on the adapter; and setting a second flag at the device driver to block input/output control calls other than from the diagnostics program. When the device driver supports multiple adapters, only the adapter undergoing diagnostics is suspended, the remaining adapters remain up to components of the switch node. Upon completion of diagnostics, components remaining in open state are restarted on their communication windows at the adapter.

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Rhinebeck, NY, United States of America

Wen Chong Chen