Presentation 2011-04-22
Method of Parallel Count Processing for avoiding the increasing time of Coherence on Many-core CPU
Satoshi KONDOH, Reiko SAKURADA, Masashi KANEKO,
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Abstract(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)
Keyword(in English) Parallel Processing / Synchronization / Cache
Paper # NS2011-15
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Conference Information
Committee NS
Conference Date 2011/4/14(1days)
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Registration To Network Systems(NS)
Language JPN
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
1st Author's Name Satoshi KONDOH
1st Author's Affiliation NTT Network Service Systems Laboratories, NTT Corporation()
2nd Author's Name Reiko SAKURADA
2nd Author's Affiliation NTT Network Service Systems Laboratories, NTT Corporation
3rd Author's Name Masashi KANEKO
3rd Author's Affiliation NTT Network Service Systems Laboratories, NTT Corporation
Date 2011-04-22
Paper # NS2011-15
Volume (vol) vol.111
Number (no) 8
Page pp.pp.-
#Pages 6
Date of Issue