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5th Annual Linux Showcase & Conference — Abstract
Pp. 71-85 of the Proceedings
PMQS : Scalable Linux Scheduling for High End Servers
Hubertus Franke, Shailabh Nagar, Mike Kravetz, Rajan Ravindran, IBM Thomas J. Watson Research Center, IBM Linux Technology Center
Abstract
The Linux kernel scheduler for large SMP and NUMA systems needs to address conflicting requirements of system througput and application
response times. This paper presents a pooled multiqueue scheduler (PMQS) designed for such high-end SMP and NUMA systems. PMQS is based
on MQS, a multiqueue scheduler that has previously been shown to significantly improve upon the scalability of the current Linux 2.4 scheduler. Load
imbalances introduced by the pooling approach are reduced by a load balancing module. The paper presents different kinds of load balancers and
compares their efficacy. The performance evaluation of PMQS and the load balancer is carried out using application and microbenchmarks with mixed
results. Pooling is shown to have potential for further improving MQS' performance though more work needs to be done on the load balancers.
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