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Tempest and Typhoon: User-level Shared Memory

University of Wisconsin--Madison. Computer Sciences DepartmentSteven K. Reinhardt

出版	University of Wisconsin-Madison, Computer Sciences Department, 1994
URL	http://books.google.com.hk/books?id=VeYgHQAACAAJ&hl=&source=gbs_api

註釋Abstract: "Future parallel computers must efficiently execute not only hand-coded applications but also programs written in high-level, parallel programming languages. Today's machines limit these programs to a single communication paradigm, either message-passing or shared memory, which results in uneven performance. This paper addresses this problem by defining an interface, Tempest, that exposes low-level communication and memory-system mechanisms so programmers and compilers can customize policies for a given application. Typhoon is a proposed hardware platform that implements these mechanisms with a fully-programmable, user-level processor in the network interface. We demonstrate the utility of Tempest with two examples. First, the Stache protocol uses Tempest's fine-grain access control mechanisms to manage part of a processor's local memory as a large, fully-associative cache for remote data. We simulated Typhoon on the Wisconsin Wind Tunnel and found Stache running on Typhoon performs comparably ([+ or -]30%) to an all-hardware Dir[subscript N]NB cache- coherence protocol for five shared-memory programs. Second, we illustrate how programmers or compilers can use Tempest's flexibility to exploit an application's sharing patterns with a custom protocol. For the EM3D application, the custom protocol improves performance up to 35% over the all-hardware protocol."