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| Presentation | 2011-04-22 14:15 Method of Parallel Count Processing for avoiding the increasing time of Coherence on Many-core CPU Satoshi Kondoh, Reiko Sakurada, Masashi Kaneko (NTT)  NS2011-15 |
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| Abstract | (in Japanese) | (See Japanese page) |
| (in English) | Recently, the performance gain of CPU has come to rely on the number of cores, because of the heat problem according to the CPU frequency rise. Generally, to use up the performance in multi core CPU, we should program by the style of high parallelism. According to the Amdahl’s law, we have done various optimizations, such as minimization of sequential processing part, in order to improve the parallelism in the past. In many-core CPU that will appear in the future, it is understood not to be able to solve the bottleneck by only these techniques by the recent researches. Especially, these researches pointed out that the overhead of cash coherence for cores’ synchronization increase and cause bottleneck even if small processing such as count processing exist. To solve this problem, in the past, technique, which each core by thread counts independently and integrates values at the end, was proposed. As other technique, method using Optimistic Lock was proposed too. However, because we use the counter with some condition sentence generally, we should add the value of each core to the shared variable. In this case, overhead for synchronization cause every processing loop in the thread. Then, in this paper, we propose the method that improves parallelism by reducing the frequency of synchronization. | |
| Keyword | (in Japanese) | (See Japanese page) |
| (in English) | Parallel Processing / Synchronization / Cache / / / / / | |
| Reference Info. | IEICE Tech. Rep., vol. 111, no. 8, NS2011-15, pp. 83-88, April 2011. | |
| Paper # | NS2011-15 | |
| Date of Issue | 2011-04-14 (NS) | |
| ISSN | Print edition: ISSN 0913-5685 Online edition: ISSN 2432-6380 | |
| Copyright and reproduction |
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034) | |
| Download PDF | NS2011-15 |
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| Conference Information | |
| Committee | NS |
| Conference Date | 2011-04-21 - 2011-04-22 |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Fukui University |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Traffic, Network evaluation, Performance, Resource Management/Control, Traffic Engineering |
| Paper Information | |
| Registration To | NS |
| Conference Code | 2011-04-NS |
| Language | Japanese |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Method of Parallel Count Processing for avoiding the increasing time of Coherence on Many-core CPU |
| Sub Title (in English) | |
| Keyword(1) | Parallel Processing |
| Keyword(2) | Synchronization |
| Keyword(3) | Cache |
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| Keyword(8) | |
| 1st Author's Name | Satoshi Kondoh |
| 1st Author's Affiliation | NTT (NTT) |
| 2nd Author's Name | Reiko Sakurada |
| 2nd Author's Affiliation | NTT (NTT) |
| 3rd Author's Name | Masashi Kaneko |
| 3rd Author's Affiliation | NTT (NTT) |
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| Speaker | Author-1 |
| Date Time | 2011-04-22 14:15:00 |
| Presentation Time | 25 minutes |
| Registration for | NS |
| Paper # | NS2011-15 |
| Volume (vol) | vol.111 |
| Number (no) | no.8 |
| Page | pp.83-88 |
| #Pages | 6 |
| Date of Issue | 2011-04-14 (NS) |
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