Relative Performance of Hardware and Software-Only Directory Protocols Under Latency Tolerating and Reducing Techniques
| Document type: | Conference Papers |
|---|---|
| Peer reviewed: | Yes |
| Full text: | |
| Author(s): | Håkan Grahn, Per Stenström |
| Title: | Relative Performance of Hardware and Software-Only Directory Protocols Under Latency Tolerating and Reducing Techniques |
| Conference name: | 11th International Parallel Processing Symposium, IPPS 97 Apr 1-5 1997 |
| Year: | 1997 |
| Pagination: | 500-506 |
| ISBN: | 0818677937 |
| Publisher: | IEEE |
| City: | Geneva, Switzerland |
| ISI number: | A1997BH56G00073 |
| Organization: | Blekinge Institute of Technology |
| Department: | Dept. of Computer Science and Business Administration (Institutionen för datavetenskap och ekonomi) Dept. of Computer Science and Business Administration S-372 25 Ronneby +46 455 780 00 http://www.ide.hk-r.se/ |
| Authors e-mail: | hakan.grahn@ide.hk-r.se |
| Language: | English |
| Abstract: | In both hardware-only and software-only directory protocols the performance is often limited by memory access stall times. To increase the performance, several latency tolerating and reducing techniques have been proposed and shown effective for hardware-only directory protocols. For software-only directory protocols, the efficiency of a technique depends not only on how effective it is as seen by the local processor, but also on how it impacts the software handler execution overhead in the node where a memory block is allocated. Based on architectural simulations and case studies of three techniques, we find that prefetching can degrade the performance of software-only directory protocols due to useless prefetches. A relaxed memory consistency model hides all write latency for software-only directory protocols, but the software handler overhead is virtually unaffected and now constitutes a larger portion of the execution time. Overall, latency tolerating techniques for software-only directory protocols must be chosen with more care than for hardware-only directory protocols. |
| Subject: | Computer Science\Computersystems |
| Keywords: | Network protocols; Data reduction; Storage allocation (computer); Program processors; Computer hardware; Computer simulation; Computer networks; Optimization; Data acquisition |
| Note: | Also presented at 6th Workshop on Scalable Shared-Memory Multiprocessors, October 1996 |
