Frontiers of Information Technology & Electronic Engineering
>> 2020,
Volume 21,
Issue 6
doi:
10.1631/FITEE.1900075
OHTMA: an optimized heuristic topology-aware mapping algorithm on the Tianhe-3 exascale supercomputer prototype
国防科技大学计算机学院并行与分布处理国家重点实验室，中国长沙市，410073
Received: 2019-02-09
Accepted: 2020-06-12
Available online: 2020-06-12
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Abstract
With the rapid increase of the size of applications and the complexity of the supercomputer architecture, topology-aware process mapping becomes increasingly important. High communication cost has become a dominant constraint of the performance of applications running on the supercomputer. To avoid a bad mapping strategy which can lead to terrible communication performance, we propose an optimized heuristic topology-aware mapping algorithm (OHTMA). The algorithm attempts to minimize the hop-byte metric that we use to measure the mapping results. OHTMA incorporates a new greedy heuristic method and pair-exchange-based optimization. It reduces the number of long-distance communications and effectively enhances the locality of the communication. Experimental results on the Tianhe-3 exascale supercomputer prototype indicate that OHTMA can significantly reduce the communication costs.
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