Scheduling and page migration for multiprocessor compute servers
ASPLOS VI Proceedings of the sixth international conference on Architectural support for programming languages and operating systems
On the importance of parallel application placement in NUMA multiprocessors
Sedms'93 USENIX Systems on USENIX Experiences with Distributed and Multiprocessor Systems - Volume 4
HiPC'06 Proceedings of the 13th international conference on High Performance Computing
Adaptive MPI multirail tuning for non-uniform input/output access
EuroMPI'10 Proceedings of the 17th European MPI users' group meeting conference on Recent advances in the message passing interface
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The ever-growing level of parallelism within the multi-core and multi-processor nodes in clusters leads to the generalization of distributed memory banks and busses with nonuniform access costs. These NUMA effects have been mostly studied in the context of threads scheduling and are known to have an influence on high-performance networking in clusters. We present an evaluation of their impact on communication performance in multi-Opteron machines. NUMA effects exhibit a strong and asymmetric impact on high-bandwidth communications while the impact on latency remains low. We then describe the implementation of an automatic NUMA-aware placement strategy which achieves as good communication performance as a careful manual placement, and thus ensures performance portability by gathering hardware topology information and placing communicating tasks accordingly.