A Memory-Level Parallelism Aware Fetch Policy for SMT Processors

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A Memory-Level Parallelism Aware Fetch Policy for SMT Processors
A thread executing on a simultaneous multithreading (SMT) processor that experiences a long-latency load will eventually stall while holding execution resources. Existing long-latency load aware SMT fetch policies limit the amount of resources allocated by a stalled thread by identifying long-latency loads and preventing the given thread from fetching more instructions -- and in some implementations, instructions beyond the long-latency load may even be flushed which frees allocated resources. This paper proposes an SMT fetch policy that takes into account the available memory-level parallelism (MLP) in a thread. The key idea proposed in this paper is that in case of an isolated long-latency load, i.e., there is no MLP, the thread should be prevented from allocating additional resources. However, in case multiple independent long-latency loads overlap, i.e., there is MLP, the thread should allocate as many resources as needed in order to fully expose the available MLP. The proposed ML...
Stijn Eyerman, Lieven Eeckhout
Added 01 Dec 2009
Updated 01 Dec 2009
Type Conference
Year 2007
Where HPCA
Authors Stijn Eyerman, Lieven Eeckhout
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